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Ticket #44952: post.php

File post.php, 215.2 KB (added by eArtboard, 16 months ago)

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1	<?php
2	/**
3	* Core Post API
4	*
5	* @package WordPress
6	* @subpackage Post
7	*/
8
9	//
10	// Post Type Registration
11	//
12
13	/**
14	* Creates the initial post types when 'init' action is fired.
15	*
16	* See {@see 'init'}.
17	*
18	* @since 2.9.0
19	*/
20	function create_initial_post_types() {
21	register_post_type( 'post', array(
22	'labels' => array(
23	'name_admin_bar' => _x( 'Post', 'add new from admin bar' ),
24	),
25	'public' => true,
26	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
27	'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
28	'capability_type' => 'post',
29	'map_meta_cap' => true,
30	'menu_position' => 5,
31	'hierarchical' => false,
32	'rewrite' => false,
33	'query_var' => false,
34	'delete_with_user' => true,
35	'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'trackbacks', 'custom-fields', 'comments', 'revisions', 'post-formats' ),
36	'show_in_rest' => true,
37	'rest_base' => 'posts',
38	'rest_controller_class' => 'WP_REST_Posts_Controller',
39	) );
40
41	register_post_type( 'page', array(
42	'labels' => array(
43	'name_admin_bar' => _x( 'Page', 'add new from admin bar' ),
44	),
45	'public' => true,
46
47	'publicly_queryable' => false,
48	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
49	'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
50	'capability_type' => 'page',
51	'map_meta_cap' => true,
52	'menu_position' => 20,
53	'hierarchical' => true,
54	'rewrite' => false,
55	'query_var' => false,
56	'delete_with_user' => true,
57	'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'page-attributes', 'custom-fields', 'comments', 'revisions' ),
58	'show_in_rest' => true,
59	'rest_base' => 'pages',
60	'rest_controller_class' => 'WP_REST_Posts_Controller',
61	) );
62
63	register_post_type( 'attachment', array(
64	'labels' => array(
65	'name' => _x('Media', 'post type general name'),
66	'name_admin_bar' => _x( 'Media', 'add new from admin bar' ),
67	'add_new' => _x( 'Add New', 'add new media' ),
68	'edit_item' => __( 'Edit Media' ),
69	'view_item' => __( 'View Attachment Page' ),
70	'attributes' => __( 'Attachment Attributes' ),
71	),
72	'public' => true,
73	'show_ui' => true,
74	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
75	'_edit_link' => 'post.php?post=%d', /* internal use only. don't use this when registering your own post type. */
76	'capability_type' => 'post',
77	'capabilities' => array(
78	'create_posts' => 'upload_files',
79	),
80	'map_meta_cap' => true,
81	'hierarchical' => false,
82	'rewrite' => false,
83	'query_var' => false,
84	'show_in_nav_menus' => false,
85	'delete_with_user' => true,
86	'supports' => array( 'title', 'author', 'comments' ),
87	'show_in_rest' => true,
88	'rest_base' => 'media',
89	'rest_controller_class' => 'WP_REST_Attachments_Controller',
90	) );
91	add_post_type_support( 'attachment:audio', 'thumbnail' );
92	add_post_type_support( 'attachment:video', 'thumbnail' );
93
94	register_post_type( 'revision', array(
95	'labels' => array(
96	'name' => __( 'Revisions' ),
97	'singular_name' => __( 'Revision' ),
98	),
99	'public' => false,
100	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
101	'_edit_link' => 'revision.php?revision=%d', /* internal use only. don't use this when registering your own post type. */
102	'capability_type' => 'post',
103	'map_meta_cap' => true,
104	'hierarchical' => false,
105	'rewrite' => false,
106	'query_var' => false,
107	'can_export' => false,
108	'delete_with_user' => true,
109	'supports' => array( 'author' ),
110	) );
111
112	register_post_type( 'nav_menu_item', array(
113	'labels' => array(
114	'name' => __( 'Navigation Menu Items' ),
115	'singular_name' => __( 'Navigation Menu Item' ),
116	),
117	'public' => false,
118	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
119	'hierarchical' => false,
120	'rewrite' => false,
121	'delete_with_user' => false,
122	'query_var' => false,
123	) );
124
125	register_post_type( 'custom_css', array(
126	'labels' => array(
127	'name' => __( 'Custom CSS' ),
128	'singular_name' => __( 'Custom CSS' ),
129	),
130	'public' => false,
131	'hierarchical' => false,
132	'rewrite' => false,
133	'query_var' => false,
134	'delete_with_user' => false,
135	'can_export' => true,
136	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
137	'supports' => array( 'title', 'revisions' ),
138	'capabilities' => array(
139	'delete_posts' => 'edit_theme_options',
140	'delete_post' => 'edit_theme_options',
141	'delete_published_posts' => 'edit_theme_options',
142	'delete_private_posts' => 'edit_theme_options',
143	'delete_others_posts' => 'edit_theme_options',
144	'edit_post' => 'edit_css',
145	'edit_posts' => 'edit_css',
146	'edit_others_posts' => 'edit_css',
147	'edit_published_posts' => 'edit_css',
148	'read_post' => 'read',
149	'read_private_posts' => 'read',
150	'publish_posts' => 'edit_theme_options',
151	),
152	) );
153
154	register_post_type( 'customize_changeset', array(
155	'labels' => array(
156	'name' => _x( 'Changesets', 'post type general name' ),
157	'singular_name' => _x( 'Changeset', 'post type singular name' ),
158	'menu_name' => _x( 'Changesets', 'admin menu' ),
159	'name_admin_bar' => _x( 'Changeset', 'add new on admin bar' ),
160	'add_new' => _x( 'Add New', 'Customize Changeset' ),
161	'add_new_item' => __( 'Add New Changeset' ),
162	'new_item' => __( 'New Changeset' ),
163	'edit_item' => __( 'Edit Changeset' ),
164	'view_item' => __( 'View Changeset' ),
165	'all_items' => __( 'All Changesets' ),
166	'search_items' => __( 'Search Changesets' ),
167	'not_found' => __( 'No changesets found.' ),
168	'not_found_in_trash' => __( 'No changesets found in Trash.' ),
169	),
170	'public' => false,
171	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
172	'map_meta_cap' => true,
173	'hierarchical' => false,
174	'rewrite' => false,
175	'query_var' => false,
176	'can_export' => false,
177	'delete_with_user' => false,
178	'supports' => array( 'title', 'author' ),
179	'capability_type' => 'customize_changeset',
180	'capabilities' => array(
181	'create_posts' => 'customize',
182	'delete_others_posts' => 'customize',
183	'delete_post' => 'customize',
184	'delete_posts' => 'customize',
185	'delete_private_posts' => 'customize',
186	'delete_published_posts' => 'customize',
187	'edit_others_posts' => 'customize',
188	'edit_post' => 'customize',
189	'edit_posts' => 'customize',
190	'edit_private_posts' => 'customize',
191	'edit_published_posts' => 'do_not_allow',
192	'publish_posts' => 'customize',
193	'read' => 'read',
194	'read_post' => 'customize',
195	'read_private_posts' => 'customize',
196	),
197	) );
198
199	register_post_type( 'oembed_cache', array(
200	'labels' => array(
201	'name' => __( 'oEmbed Responses' ),
202	'singular_name' => __( 'oEmbed Response' ),
203	),
204	'public' => false,
205	'hierarchical' => false,
206	'rewrite' => false,
207	'query_var' => false,
208	'delete_with_user' => false,
209	'can_export' => false,
210	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
211	'supports' => array(),
212	) );
213
214	register_post_type( 'user_request', array(
215	'labels' => array(
216	'name' => __( 'User Requests' ),
217	'singular_name' => __( 'User Request' ),
218	),
219	'public' => false,
220	'_builtin' => true, /* internal use only. don't use this when registering your own post type. */
221	'hierarchical' => false,
222	'rewrite' => false,
223	'query_var' => false,
224	'can_export' => false,
225	'delete_with_user' => false,
226	'supports' => array(),
227	) );
228
229	register_post_status( 'publish', array(
230	'label' => _x( 'Published', 'post status' ),
231	'public' => true,
232	'_builtin' => true, /* internal use only. */
233	'label_count' => _n_noop( 'Published <span class="count">(%s)</span>', 'Published <span class="count">(%s)</span>' ),
234	) );
235
236	register_post_status( 'future', array(
237	'label' => _x( 'Scheduled', 'post status' ),
238	'protected' => true,
239	'_builtin' => true, /* internal use only. */
240	'label_count' => _n_noop('Scheduled <span class="count">(%s)</span>', 'Scheduled <span class="count">(%s)</span>' ),
241	) );
242
243	register_post_status( 'draft', array(
244	'label' => _x( 'Draft', 'post status' ),
245	'protected' => true,
246	'_builtin' => true, /* internal use only. */
247	'label_count' => _n_noop( 'Draft <span class="count">(%s)</span>', 'Drafts <span class="count">(%s)</span>' ),
248	) );
249
250	register_post_status( 'pending', array(
251	'label' => _x( 'Pending', 'post status' ),
252	'protected' => true,
253	'_builtin' => true, /* internal use only. */
254	'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
255	) );
256
257	register_post_status( 'private', array(
258	'label' => _x( 'Private', 'post status' ),
259	'private' => true,
260	'_builtin' => true, /* internal use only. */
261	'label_count' => _n_noop( 'Private <span class="count">(%s)</span>', 'Private <span class="count">(%s)</span>' ),
262	) );
263
264	register_post_status( 'trash', array(
265	'label' => _x( 'Trash', 'post status' ),
266	'internal' => true,
267	'_builtin' => true, /* internal use only. */
268	'label_count' => _n_noop( 'Trash <span class="count">(%s)</span>', 'Trash <span class="count">(%s)</span>' ),
269	'show_in_admin_status_list' => true,
270	) );
271
272	register_post_status( 'auto-draft', array(
273	'label' => 'auto-draft',
274	'internal' => true,
275	'_builtin' => true, /* internal use only. */
276	) );
277
278	register_post_status( 'inherit', array(
279	'label' => 'inherit',
280	'internal' => true,
281	'_builtin' => true, /* internal use only. */
282	'exclude_from_search' => false,
283	) );
284
285	register_post_status( 'request-pending', array(
286	'label' => _x( 'Pending', 'request status' ),
287	'internal' => true,
288	'_builtin' => true, /* internal use only. */
289	'label_count' => _n_noop( 'Pending <span class="count">(%s)</span>', 'Pending <span class="count">(%s)</span>' ),
290	'exclude_from_search' => false,
291	) );
292
293	register_post_status( 'request-confirmed', array(
294	'label' => _x( 'Confirmed', 'request status' ),
295	'internal' => true,
296	'_builtin' => true, /* internal use only. */
297	'label_count' => _n_noop( 'Confirmed <span class="count">(%s)</span>', 'Confirmed <span class="count">(%s)</span>' ),
298	'exclude_from_search' => false,
299	) );
300
301	register_post_status( 'request-failed', array(
302	'label' => _x( 'Failed', 'request status' ),
303	'internal' => true,
304	'_builtin' => true, /* internal use only. */
305	'label_count' => _n_noop( 'Failed <span class="count">(%s)</span>', 'Failed <span class="count">(%s)</span>' ),
306	'exclude_from_search' => false,
307	) );
308
309	register_post_status( 'request-completed', array(
310	'label' => _x( 'Completed', 'request status' ),
311	'internal' => true,
312	'_builtin' => true, /* internal use only. */
313	'label_count' => _n_noop( 'Completed <span class="count">(%s)</span>', 'Completed <span class="count">(%s)</span>' ),
314	'exclude_from_search' => false,
315	) );
316	}
317
318	/**
319	* Retrieve attached file path based on attachment ID.
320	*
321	* By default the path will go through the 'get_attached_file' filter, but
322	* passing a true to the $unfiltered argument of get_attached_file() will
323	* return the file path unfiltered.
324	*
325	* The function works by getting the single post meta name, named
326	* '_wp_attached_file' and returning it. This is a convenience function to
327	* prevent looking up the meta name and provide a mechanism for sending the
328	* attached filename through a filter.
329	*
330	* @since 2.0.0
331	*
332	* @param int $attachment_id Attachment ID.
333	* @param bool $unfiltered Optional. Whether to apply filters. Default false.
334	* @return string\|false The file path to where the attached file should be, false otherwise.
335	*/
336	function get_attached_file( $attachment_id, $unfiltered = false ) {
337	$file = get_post_meta( $attachment_id, '_wp_attached_file', true );
338
339	// If the file is relative, prepend upload dir.
340	if ( $file && 0 !== strpos( $file, '/' ) && ! preg_match( '\|^.:\\\\|', $file ) && ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) ) {
341	$file = $uploads['basedir'] . "/$file";
342	}
343
344	if ( $unfiltered ) {
345	return $file;
346	}
347
348	/**
349	* Filters the attached file based on the given ID.
350	*
351	* @since 2.1.0
352	*
353	* @param string $file Path to attached file.
354	* @param int $attachment_id Attachment ID.
355	*/
356	return apply_filters( 'get_attached_file', $file, $attachment_id );
357	}
358
359	/**
360	* Update attachment file path based on attachment ID.
361	*
362	* Used to update the file path of the attachment, which uses post meta name
363	* '_wp_attached_file' to store the path of the attachment.
364	*
365	* @since 2.1.0
366	*
367	* @param int $attachment_id Attachment ID.
368	* @param string $file File path for the attachment.
369	* @return bool True on success, false on failure.
370	*/
371	function update_attached_file( $attachment_id, $file ) {
372	if ( !get_post( $attachment_id ) )
373	return false;
374
375	/**
376	* Filters the path to the attached file to update.
377	*
378	* @since 2.1.0
379	*
380	* @param string $file Path to the attached file to update.
381	* @param int $attachment_id Attachment ID.
382	*/
383	$file = apply_filters( 'update_attached_file', $file, $attachment_id );
384
385	if ( $file = _wp_relative_upload_path( $file ) )
386	return update_post_meta( $attachment_id, '_wp_attached_file', $file );
387	else
388	return delete_post_meta( $attachment_id, '_wp_attached_file' );
389	}
390
391	/**
392	* Return relative path to an uploaded file.
393	*
394	* The path is relative to the current upload dir.
395	*
396	* @since 2.9.0
397	*
398	* @param string $path Full path to the file.
399	* @return string Relative path on success, unchanged path on failure.
400	*/
401	function _wp_relative_upload_path( $path ) {
402	$new_path = $path;
403
404	$uploads = wp_get_upload_dir();
405	if ( 0 === strpos( $new_path, $uploads['basedir'] ) ) {
406	$new_path = str_replace( $uploads['basedir'], '', $new_path );
407	$new_path = ltrim( $new_path, '/' );
408	}
409
410	/**
411	* Filters the relative path to an uploaded file.
412	*
413	* @since 2.9.0
414	*
415	* @param string $new_path Relative path to the file.
416	* @param string $path Full path to the file.
417	*/
418	return apply_filters( '_wp_relative_upload_path', $new_path, $path );
419	}
420
421	/**
422	* Retrieve all children of the post parent ID.
423	*
424	* Normally, without any enhancements, the children would apply to pages. In the
425	* context of the inner workings of WordPress, pages, posts, and attachments
426	* share the same table, so therefore the functionality could apply to any one
427	* of them. It is then noted that while this function does not work on posts, it
428	* does not mean that it won't work on posts. It is recommended that you know
429	* what context you wish to retrieve the children of.
430	*
431	* Attachments may also be made the child of a post, so if that is an accurate
432	* statement (which needs to be verified), it would then be possible to get
433	* all of the attachments for a post. Attachments have since changed since
434	* version 2.5, so this is most likely inaccurate, but serves generally as an
435	* example of what is possible.
436	*
437	* The arguments listed as defaults are for this function and also of the
438	* get_posts() function. The arguments are combined with the get_children defaults
439	* and are then passed to the get_posts() function, which accepts additional arguments.
440	* You can replace the defaults in this function, listed below and the additional
441	* arguments listed in the get_posts() function.
442	*
443	* The 'post_parent' is the most important argument and important attention
444	* needs to be paid to the $args parameter. If you pass either an object or an
445	* integer (number), then just the 'post_parent' is grabbed and everything else
446	* is lost. If you don't specify any arguments, then it is assumed that you are
447	* in The Loop and the post parent will be grabbed for from the current post.
448	*
449	* The 'post_parent' argument is the ID to get the children. The 'numberposts'
450	* is the amount of posts to retrieve that has a default of '-1', which is
451	* used to get all of the posts. Giving a number higher than 0 will only
452	* retrieve that amount of posts.
453	*
454	* The 'post_type' and 'post_status' arguments can be used to choose what
455	* criteria of posts to retrieve. The 'post_type' can be anything, but WordPress
456	* post types are 'post', 'pages', and 'attachments'. The 'post_status'
457	* argument will accept any post status within the write administration panels.
458	*
459	* @since 2.0.0
460	*
461	* @see get_posts()
462	* @todo Check validity of description.
463	*
464	* @global WP_Post $post
465	*
466	* @param mixed $args Optional. User defined arguments for replacing the defaults. Default empty.
467	* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
468	* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
469	* @return array Array of children, where the type of each element is determined by $output parameter.
470	* Empty array on failure.
471	*/
472	function get_children( $args = '', $output = OBJECT ) {
473	$kids = array();
474	if ( empty( $args ) ) {
475	if ( isset( $GLOBALS['post'] ) ) {
476	$args = array('post_parent' => (int) $GLOBALS['post']->post_parent );
477	} else {
478	return $kids;
479	}
480	} elseif ( is_object( $args ) ) {
481	$args = array('post_parent' => (int) $args->post_parent );
482	} elseif ( is_numeric( $args ) ) {
483	$args = array('post_parent' => (int) $args);
484	}
485
486	$defaults = array(
487	'numberposts' => -1, 'post_type' => 'any',
488	'post_status' => 'any', 'post_parent' => 0,
489	);
490
491	$r = wp_parse_args( $args, $defaults );
492
493	$children = get_posts( $r );
494
495	if ( ! $children )
496	return $kids;
497
498	if ( ! empty( $r['fields'] ) )
499	return $children;
500
501	update_post_cache($children);
502
503	foreach ( $children as $key => $child )
504	$kids[$child->ID] = $children[$key];
505
506	if ( $output == OBJECT ) {
507	return $kids;
508	} elseif ( $output == ARRAY_A ) {
509	$weeuns = array();
510	foreach ( (array) $kids as $kid ) {
511	$weeuns[$kid->ID] = get_object_vars($kids[$kid->ID]);
512	}
513	return $weeuns;
514	} elseif ( $output == ARRAY_N ) {
515	$babes = array();
516	foreach ( (array) $kids as $kid ) {
517	$babes[$kid->ID] = array_values(get_object_vars($kids[$kid->ID]));
518	}
519	return $babes;
520	} else {
521	return $kids;
522	}
523	}
524
525	/**
526	* Get extended entry info (<!--more-->).
527	*
528	* There should not be any space after the second dash and before the word
529	* 'more'. There can be text or space(s) after the word 'more', but won't be
530	* referenced.
531	*
532	* The returned array has 'main', 'extended', and 'more_text' keys. Main has the text before
533	* the `<!--more-->`. The 'extended' key has the content after the
534	* `<!--more-->` comment. The 'more_text' key has the custom "Read More" text.
535	*
536	* @since 1.0.0
537	*
538	* @param string $post Post content.
539	* @return array Post before ('main'), after ('extended'), and custom read more ('more_text').
540	*/
541	function get_extended( $post ) {
542	//Match the new style more links.
543	if ( preg_match('/<!--more(.*?)?-->/', $post, $matches) ) {
544	list($main, $extended) = explode($matches[0], $post, 2);
545	$more_text = $matches[1];
546	} else {
547	$main = $post;
548	$extended = '';
549	$more_text = '';
550	}
551
552	// leading and trailing whitespace.
553	$main = preg_replace('/^[\s](.)[\s]*$/', '\\1', $main);
554	$extended = preg_replace('/^[\s](.)[\s]*$/', '\\1', $extended);
555	$more_text = preg_replace('/^[\s](.)[\s]*$/', '\\1', $more_text);
556
557	return array( 'main' => $main, 'extended' => $extended, 'more_text' => $more_text );
558	}
559
560	/**
561	* Retrieves post data given a post ID or post object.
562	*
563	* See sanitize_post() for optional $filter values. Also, the parameter
564	* `$post`, must be given as a variable, since it is passed by reference.
565	*
566	* @since 1.5.1
567	*
568	* @global WP_Post $post
569	*
570	* @param int\|WP_Post\|null $post Optional. Post ID or post object. Defaults to global $post.
571	* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
572	* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
573	* @param string $filter Optional. Type of filter to apply. Accepts 'raw', 'edit', 'db',
574	* or 'display'. Default 'raw'.
575	* @return WP_Post\|array\|null Type corresponding to $output on success or null on failure.
576	* When $output is OBJECT, a `WP_Post` instance is returned.
577	*/
578	function get_post( $post = null, $output = OBJECT, $filter = 'raw' ) {
579	if ( empty( $post ) && isset( $GLOBALS['post'] ) )
580	$post = $GLOBALS['post'];
581
582	if ( $post instanceof WP_Post ) {
583	$_post = $post;
584	} elseif ( is_object( $post ) ) {
585	if ( empty( $post->filter ) ) {
586	$_post = sanitize_post( $post, 'raw' );
587	$_post = new WP_Post( $_post );
588	} elseif ( 'raw' == $post->filter ) {
589	$_post = new WP_Post( $post );
590	} else {
591	$_post = WP_Post::get_instance( $post->ID );
592	}
593	} else {
594	$_post = WP_Post::get_instance( $post );
595	}
596
597	if ( ! $_post )
598	return null;
599
600	$_post = $_post->filter( $filter );
601
602	if ( $output == ARRAY_A )
603	return $_post->to_array();
604	elseif ( $output == ARRAY_N )
605	return array_values( $_post->to_array() );
606
607	return $_post;
608	}
609
610	/**
611	* Retrieve ancestors of a post.
612	*
613	* @since 2.5.0
614	*
615	* @param int\|WP_Post $post Post ID or post object.
616	* @return array Ancestor IDs or empty array if none are found.
617	*/
618	function get_post_ancestors( $post ) {
619	$post = get_post( $post );
620
621	if ( ! $post \|\| empty( $post->post_parent ) \|\| $post->post_parent == $post->ID )
622	return array();
623
624	$ancestors = array();
625
626	$id = $ancestors[] = $post->post_parent;
627
628	while ( $ancestor = get_post( $id ) ) {
629	// Loop detection: If the ancestor has been seen before, break.
630	if ( empty( $ancestor->post_parent ) \|\| ( $ancestor->post_parent == $post->ID ) \|\| in_array( $ancestor->post_parent, $ancestors ) )
631	break;
632
633	$id = $ancestors[] = $ancestor->post_parent;
634	}
635
636	return $ancestors;
637	}
638
639	/**
640	* Retrieve data from a post field based on Post ID.
641	*
642	* Examples of the post field will be, 'post_type', 'post_status', 'post_content',
643	* etc and based off of the post object property or key names.
644	*
645	* The context values are based off of the taxonomy filter functions and
646	* supported values are found within those functions.
647	*
648	* @since 2.3.0
649	* @since 4.5.0 The `$post` parameter was made optional.
650	*
651	* @see sanitize_post_field()
652	*
653	* @param string $field Post field name.
654	* @param int\|WP_Post $post Optional. Post ID or post object. Defaults to current post.
655	* @param string $context Optional. How to filter the field. Accepts 'raw', 'edit', 'db',
656	* or 'display'. Default 'display'.
657	* @return string The value of the post field on success, empty string on failure.
658	*/
659	function get_post_field( $field, $post = null, $context = 'display' ) {
660	$post = get_post( $post );
661
662	if ( !$post )
663	return '';
664
665	if ( !isset($post->$field) )
666	return '';
667
668	return sanitize_post_field($field, $post->$field, $post->ID, $context);
669	}
670
671	/**
672	* Retrieve the mime type of an attachment based on the ID.
673	*
674	* This function can be used with any post type, but it makes more sense with
675	* attachments.
676	*
677	* @since 2.0.0
678	*
679	* @param int\|WP_Post $ID Optional. Post ID or post object. Default empty.
680	* @return string\|false The mime type on success, false on failure.
681	*/
682	function get_post_mime_type( $ID = '' ) {
683	$post = get_post($ID);
684
685	if ( is_object($post) )
686	return $post->post_mime_type;
687
688	return false;
689	}
690
691	/**
692	* Retrieve the post status based on the Post ID.
693	*
694	* If the post ID is of an attachment, then the parent post status will be given
695	* instead.
696	*
697	* @since 2.0.0
698	*
699	* @param int\|WP_Post $ID Optional. Post ID or post object. Default empty.
700	* @return string\|false Post status on success, false on failure.
701	*/
702	function get_post_status( $ID = '' ) {
703	$post = get_post($ID);
704
705	if ( !is_object($post) )
706	return false;
707
708	if ( 'attachment' == $post->post_type ) {
709	if ( 'private' == $post->post_status )
710	return 'private';
711
712	// Unattached attachments are assumed to be published.
713	if ( ( 'inherit' == $post->post_status ) && ( 0 == $post->post_parent) )
714	return 'publish';
715
716	// Inherit status from the parent.
717	if ( $post->post_parent && ( $post->ID != $post->post_parent ) ) {
718	$parent_post_status = get_post_status( $post->post_parent );
719	if ( 'trash' == $parent_post_status ) {
720	return get_post_meta( $post->post_parent, '_wp_trash_meta_status', true );
721	} else {
722	return $parent_post_status;
723	}
724	}
725
726	}
727
728	/**
729	* Filters the post status.
730	*
731	* @since 4.4.0
732	*
733	* @param string $post_status The post status.
734	* @param WP_Post $post The post object.
735	*/
736	return apply_filters( 'get_post_status', $post->post_status, $post );
737	}
738
739	/**
740	* Retrieve all of the WordPress supported post statuses.
741	*
742	* Posts have a limited set of valid status values, this provides the
743	* post_status values and descriptions.
744	*
745	* @since 2.5.0
746	*
747	* @return array List of post statuses.
748	*/
749	function get_post_statuses() {
750	$status = array(
751	'draft' => __( 'Draft' ),
752	'pending' => __( 'Pending Review' ),
753	'private' => __( 'Private' ),
754	'publish' => __( 'Published' )
755	);
756
757	return $status;
758	}
759
760	/**
761	* Retrieve all of the WordPress support page statuses.
762	*
763	* Pages have a limited set of valid status values, this provides the
764	* post_status values and descriptions.
765	*
766	* @since 2.5.0
767	*
768	* @return array List of page statuses.
769	*/
770	function get_page_statuses() {
771	$status = array(
772	'draft' => __( 'Draft' ),
773	'private' => __( 'Private' ),
774	'publish' => __( 'Published' )
775	);
776
777	return $status;
778	}
779
780	/**
781	* Return statuses for privacy requests.
782	*
783	* @since 5.0.0
784	*
785	* @return array
786	*/
787	function _wp_privacy_statuses() {
788	return array(
789	'request-pending' => __( 'Pending' ), // Pending confirmation from user.
790	'request-confirmed' => __( 'Confirmed' ), // User has confirmed the action.
791	'request-failed' => __( 'Failed' ), // User failed to confirm the action.
792	'request-completed' => __( 'Completed' ), // Admin has handled the request.
793	);
794	}
795
796	/**
797	* Register a post status. Do not use before init.
798	*
799	* A simple function for creating or modifying a post status based on the
800	* parameters given. The function will accept an array (second optional
801	* parameter), along with a string for the post status name.
802	*
803	* Arguments prefixed with an _underscore shouldn't be used by plugins and themes.
804	*
805	* @since 3.0.0
806	* @global array $wp_post_statuses Inserts new post status object into the list
807	*
808	* @param string $post_status Name of the post status.
809	* @param array\|string $args {
810	* Optional. Array or string of post status arguments.
811	*
812	* @type bool\|string $label A descriptive name for the post status marked
813	* for translation. Defaults to value of $post_status.
814	* @type bool\|array $label_count Descriptive text to use for nooped plurals.
815	* Default array of $label, twice
816	* @type bool $exclude_from_search Whether to exclude posts with this post status
817	* from search results. Default is value of $internal.
818	* @type bool $_builtin Whether the status is built-in. Core-use only.
819	* Default false.
820	* @type bool $public Whether posts of this status should be shown
821	* in the front end of the site. Default false.
822	* @type bool $internal Whether the status is for internal use only.
823	* Default false.
824	* @type bool $protected Whether posts with this status should be protected.
825	* Default false.
826	* @type bool $private Whether posts with this status should be private.
827	* Default false.
828	* @type bool $publicly_queryable Whether posts with this status should be publicly-
829	* queryable. Default is value of $public.
830	* @type bool $show_in_admin_all_list Whether to include posts in the edit listing for
831	* their post type. Default is value of $internal.
832	* @type bool $show_in_admin_status_list Show in the list of statuses with post counts at
833	* the top of the edit listings,
834	* e.g. All (12) \| Published (9) \| My Custom Status (2)
835	* Default is value of $internal.
836	* }
837	* @return object
838	*/
839	function register_post_status( $post_status, $args = array() ) {
840	global $wp_post_statuses;
841
842	if (!is_array($wp_post_statuses))
843	$wp_post_statuses = array();
844
845	// Args prefixed with an underscore are reserved for internal use.
846	$defaults = array(
847	'label' => false,
848	'label_count' => false,
849	'exclude_from_search' => null,
850	'_builtin' => false,
851	'public' => null,
852	'internal' => null,
853	'protected' => null,
854	'private' => null,
855	'publicly_queryable' => null,
856	'show_in_admin_status_list' => null,
857	'show_in_admin_all_list' => null,
858	);
859	$args = wp_parse_args($args, $defaults);
860	$args = (object) $args;
861
862	$post_status = sanitize_key($post_status);
863	$args->name = $post_status;
864
865	// Set various defaults.
866	if ( null === $args->public && null === $args->internal && null === $args->protected && null === $args->private )
867	$args->internal = true;
868
869	if ( null === $args->public )
870	$args->public = false;
871
872	if ( null === $args->private )
873	$args->private = false;
874
875	if ( null === $args->protected )
876	$args->protected = false;
877
878	if ( null === $args->internal )
879	$args->internal = false;
880
881	if ( null === $args->publicly_queryable )
882	$args->publicly_queryable = $args->public;
883
884	if ( null === $args->exclude_from_search )
885	$args->exclude_from_search = $args->internal;
886
887	if ( null === $args->show_in_admin_all_list )
888	$args->show_in_admin_all_list = !$args->internal;
889
890	if ( null === $args->show_in_admin_status_list )
891	$args->show_in_admin_status_list = !$args->internal;
892
893	if ( false === $args->label )
894	$args->label = $post_status;
895
896	if ( false === $args->label_count )
897	$args->label_count = _n_noop( $args->label, $args->label );
898
899	$wp_post_statuses[$post_status] = $args;
900
901	return $args;
902	}
903
904	/**
905	* Retrieve a post status object by name.
906	*
907	* @since 3.0.0
908	*
909	* @global array $wp_post_statuses List of post statuses.
910	*
911	* @see register_post_status()
912	*
913	* @param string $post_status The name of a registered post status.
914	* @return object\|null A post status object.
915	*/
916	function get_post_status_object( $post_status ) {
917	global $wp_post_statuses;
918
919	if ( empty($wp_post_statuses[$post_status]) )
920	return null;
921
922	return $wp_post_statuses[$post_status];
923	}
924
925	/**
926	* Get a list of post statuses.
927	*
928	* @since 3.0.0
929	*
930	* @global array $wp_post_statuses List of post statuses.
931	*
932	* @see register_post_status()
933	*
934	* @param array\|string $args Optional. Array or string of post status arguments to compare against
935	* properties of the global `$wp_post_statuses objects`. Default empty array.
936	* @param string $output Optional. The type of output to return, either 'names' or 'objects'. Default 'names'.
937	* @param string $operator Optional. The logical operation to perform. 'or' means only one element
938	* from the array needs to match; 'and' means all elements must match.
939	* Default 'and'.
940	* @return array A list of post status names or objects.
941	*/
942	function get_post_stati( $args = array(), $output = 'names', $operator = 'and' ) {
943	global $wp_post_statuses;
944
945	$field = ('names' == $output) ? 'name' : false;
946
947	return wp_filter_object_list($wp_post_statuses, $args, $operator, $field);
948	}
949
950	/**
951	* Whether the post type is hierarchical.
952	*
953	* A false return value might also mean that the post type does not exist.
954	*
955	* @since 3.0.0
956	*
957	* @see get_post_type_object()
958	*
959	* @param string $post_type Post type name
960	* @return bool Whether post type is hierarchical.
961	*/
962	function is_post_type_hierarchical( $post_type ) {
963	if ( ! post_type_exists( $post_type ) )
964	return false;
965
966	$post_type = get_post_type_object( $post_type );
967	return $post_type->hierarchical;
968	}
969
970	/**
971	* Check if a post type is registered.
972	*
973	* @since 3.0.0
974	*
975	* @see get_post_type_object()
976	*
977	* @param string $post_type Post type name.
978	* @return bool Whether post type is registered.
979	*/
980	function post_type_exists( $post_type ) {
981	return (bool) get_post_type_object( $post_type );
982	}
983
984	/**
985	* Retrieves the post type of the current post or of a given post.
986	*
987	* @since 2.1.0
988	*
989	* @param int\|WP_Post\|null $post Optional. Post ID or post object. Default is global $post.
990	* @return string\|false Post type on success, false on failure.
991	*/
992	function get_post_type( $post = null ) {
993	if ( $post = get_post( $post ) )
994	return $post->post_type;
995
996	return false;
997	}
998
999	/**
1000	* Retrieves a post type object by name.
1001	*
1002	* @since 3.0.0
1003	* @since 4.6.0 Object returned is now an instance of WP_Post_Type.
1004	*
1005	* @global array $wp_post_types List of post types.
1006	*
1007	* @see register_post_type()
1008	*
1009	* @param string $post_type The name of a registered post type.
1010	* @return WP_Post_Type\|null WP_Post_Type object if it exists, null otherwise.
1011	*/
1012	function get_post_type_object( $post_type ) {
1013	global $wp_post_types;
1014
1015	if ( ! is_scalar( $post_type ) \|\| empty( $wp_post_types[ $post_type ] ) ) {
1016	return null;
1017	}
1018
1019	return $wp_post_types[ $post_type ];
1020	}
1021
1022	/**
1023	* Get a list of all registered post type objects.
1024	*
1025	* @since 2.9.0
1026	*
1027	* @global array $wp_post_types List of post types.
1028	*
1029	* @see register_post_type() for accepted arguments.
1030	*
1031	* @param array\|string $args Optional. An array of key => value arguments to match against
1032	* the post type objects. Default empty array.
1033	* @param string $output Optional. The type of output to return. Accepts post type 'names'
1034	* or 'objects'. Default 'names'.
1035	* @param string $operator Optional. The logical operation to perform. 'or' means only one
1036	* element from the array needs to match; 'and' means all elements
1037	* must match; 'not' means no elements may match. Default 'and'.
1038	* @return array A list of post type names or objects.
1039	*/
1040	function get_post_types( $args = array(), $output = 'names', $operator = 'and' ) {
1041	global $wp_post_types;
1042
1043	$field = ('names' == $output) ? 'name' : false;
1044
1045	return wp_filter_object_list($wp_post_types, $args, $operator, $field);
1046	}
1047
1048	/**
1049	* Registers a post type.
1050	*
1051	* Note: Post type registrations should not be hooked before the
1052	* {@see 'init'} action. Also, any taxonomy connections should be
1053	* registered via the `$taxonomies` argument to ensure consistency
1054	* when hooks such as {@see 'parse_query'} or {@see 'pre_get_posts'}
1055	* are used.
1056	*
1057	* Post types can support any number of built-in core features such
1058	* as meta boxes, custom fields, post thumbnails, post statuses,
1059	* comments, and more. See the `$supports` argument for a complete
1060	* list of supported features.
1061	*
1062	* @since 2.9.0
1063	* @since 3.0.0 The `show_ui` argument is now enforced on the new post screen.
1064	* @since 4.4.0 The `show_ui` argument is now enforced on the post type listing
1065	* screen and post editing screen.
1066	* @since 4.6.0 Post type object returned is now an instance of WP_Post_Type.
1067	* @since 4.7.0 Introduced `show_in_rest`, 'rest_base' and 'rest_controller_class'
1068	* arguments to register the post type in REST API.
1069	*
1070	* @global array $wp_post_types List of post types.
1071	*
1072	* @param string $post_type Post type key. Must not exceed 20 characters and may
1073	* only contain lowercase alphanumeric characters, dashes,
1074	* and underscores. See sanitize_key().
1075	* @param array\|string $args {
1076	* Array or string of arguments for registering a post type.
1077	*
1078	* @type string $label Name of the post type shown in the menu. Usually plural.
1079	* Default is value of $labels['name'].
1080	* @type array $labels An array of labels for this post type. If not set, post
1081	* labels are inherited for non-hierarchical types and page
1082	* labels for hierarchical ones. See get_post_type_labels() for a full
1083	* list of supported labels.
1084	* @type string $description A short descriptive summary of what the post type is.
1085	* Default empty.
1086	* @type bool $public Whether a post type is intended for use publicly either via
1087	* the admin interface or by front-end users. While the default
1088	* settings of $exclude_from_search, $publicly_queryable, $show_ui,
1089	* and $show_in_nav_menus are inherited from public, each does not
1090	* rely on this relationship and controls a very specific intention.
1091	* Default false.
1092	* @type bool $hierarchical Whether the post type is hierarchical (e.g. page). Default false.
1093	* @type bool $exclude_from_search Whether to exclude posts with this post type from front end search
1094	* results. Default is the opposite value of $public.
1095	* @type bool $publicly_queryable Whether queries can be performed on the front end for the post type
1096	* as part of parse_request(). Endpoints would include:
1097	* * ?post_type={post_type_key}
1098	* * ?{post_type_key}={single_post_slug}
1099	* * ?{post_type_query_var}={single_post_slug}
1100	* If not set, the default is inherited from $public.
1101	* @type bool $show_ui Whether to generate and allow a UI for managing this post type in the
1102	* admin. Default is value of $public.
1103	* @type bool $show_in_menu Where to show the post type in the admin menu. To work, $show_ui
1104	* must be true. If true, the post type is shown in its own top level
1105	* menu. If false, no menu is shown. If a string of an existing top
1106	* level menu (eg. 'tools.php' or 'edit.php?post_type=page'), the post
1107	* type will be placed as a sub-menu of that.
1108	* Default is value of $show_ui.
1109	* @type bool $show_in_nav_menus Makes this post type available for selection in navigation menus.
1110	* Default is value $public.
1111	* @type bool $show_in_admin_bar Makes this post type available via the admin bar. Default is value
1112	* of $show_in_menu.
1113	* @type bool $show_in_rest Whether to add the post type route in the REST API 'wp/v2' namespace.
1114	* @type string $rest_base To change the base url of REST API route. Default is $post_type.
1115	* @type string $rest_controller_class REST API Controller class name. Default is 'WP_REST_Posts_Controller'.
1116	* @type int $menu_position The position in the menu order the post type should appear. To work,
1117	* $show_in_menu must be true. Default null (at the bottom).
1118	* @type string $menu_icon The url to the icon to be used for this menu. Pass a base64-encoded
1119	* SVG using a data URI, which will be colored to match the color scheme
1120	* -- this should begin with 'data:image/svg+xml;base64,'. Pass the name
1121	* of a Dashicons helper class to use a font icon, e.g.
1122	* 'dashicons-chart-pie'. Pass 'none' to leave div.wp-menu-image empty
1123	* so an icon can be added via CSS. Defaults to use the posts icon.
1124	* @type string $capability_type The string to use to build the read, edit, and delete capabilities.
1125	* May be passed as an array to allow for alternative plurals when using
1126	* this argument as a base to construct the capabilities, e.g.
1127	* array('story', 'stories'). Default 'post'.
1128	* @type array $capabilities Array of capabilities for this post type. $capability_type is used
1129	* as a base to construct capabilities by default.
1130	* See get_post_type_capabilities().
1131	* @type bool $map_meta_cap Whether to use the internal default meta capability handling.
1132	* Default false.
1133	* @type array $supports Core feature(s) the post type supports. Serves as an alias for calling
1134	* add_post_type_support() directly. Core features include 'title',
1135	* 'editor', 'comments', 'revisions', 'trackbacks', 'author', 'excerpt',
1136	* 'page-attributes', 'thumbnail', 'custom-fields', and 'post-formats'.
1137	* Additionally, the 'revisions' feature dictates whether the post type
1138	* will store revisions, and the 'comments' feature dictates whether the
1139	* comments count will show on the edit screen. Defaults is an array
1140	* containing 'title' and 'editor'.
1141	* @type callable $register_meta_box_cb Provide a callback function that sets up the meta boxes for the
1142	* edit form. Do remove_meta_box() and add_meta_box() calls in the
1143	* callback. Default null.
1144	* @type array $taxonomies An array of taxonomy identifiers that will be registered for the
1145	* post type. Taxonomies can be registered later with register_taxonomy()
1146	* or register_taxonomy_for_object_type().
1147	* Default empty array.
1148	* @type bool\|string $has_archive Whether there should be post type archives, or if a string, the
1149	* archive slug to use. Will generate the proper rewrite rules if
1150	* $rewrite is enabled. Default false.
1151	* @type bool\|array $rewrite {
1152	* Triggers the handling of rewrites for this post type. To prevent rewrite, set to false.
1153	* Defaults to true, using $post_type as slug. To specify rewrite rules, an array can be
1154	* passed with any of these keys:
1155	*
1156	* @type string $slug Customize the permastruct slug. Defaults to $post_type key.
1157	* @type bool $with_front Whether the permastruct should be prepended with WP_Rewrite::$front.
1158	* Default true.
1159	* @type bool $feeds Whether the feed permastruct should be built for this post type.
1160	* Default is value of $has_archive.
1161	* @type bool $pages Whether the permastruct should provide for pagination. Default true.
1162	* @type const $ep_mask Endpoint mask to assign. If not specified and permalink_epmask is set,
1163	* inherits from $permalink_epmask. If not specified and permalink_epmask
1164	* is not set, defaults to EP_PERMALINK.
1165	* }
1166	* @type string\|bool $query_var Sets the query_var key for this post type. Defaults to $post_type
1167	* key. If false, a post type cannot be loaded at
1168	* ?{query_var}={post_slug}. If specified as a string, the query
1169	* ?{query_var_string}={post_slug} will be valid.
1170	* @type bool $can_export Whether to allow this post type to be exported. Default true.
1171	* @type bool $delete_with_user Whether to delete posts of this type when deleting a user. If true,
1172	* posts of this type belonging to the user will be moved to trash
1173	* when then user is deleted. If false, posts of this type belonging
1174	* to the user will not be trashed or deleted. If not set (the default),
1175	* posts are trashed if post_type_supports('author'). Otherwise posts
1176	* are not trashed or deleted. Default null.
1177	* @type bool $_builtin FOR INTERNAL USE ONLY! True if this post type is a native or
1178	* "built-in" post_type. Default false.
1179	* @type string $_edit_link FOR INTERNAL USE ONLY! URL segment to use for edit link of
1180	* this post type. Default 'post.php?post=%d'.
1181	* }
1182	* @return WP_Post_Type\|WP_Error The registered post type object, or an error object.
1183	*/
1184	function register_post_type( $post_type, $args = array() ) {
1185	global $wp_post_types;
1186
1187	if ( ! is_array( $wp_post_types ) ) {
1188	$wp_post_types = array();
1189	}
1190
1191	// Sanitize post type name
1192	$post_type = sanitize_key( $post_type );
1193
1194	if ( empty( $post_type ) \|\| strlen( $post_type ) > 20 ) {
1195	_doing_it_wrong( __FUNCTION__, __( 'Post type names must be between 1 and 20 characters in length.' ), '4.2.0' );
1196	return new WP_Error( 'post_type_length_invalid', __( 'Post type names must be between 1 and 20 characters in length.' ) );
1197	}
1198
1199	$post_type_object = new WP_Post_Type( $post_type, $args );
1200	$post_type_object->add_supports();
1201	$post_type_object->add_rewrite_rules();
1202	$post_type_object->register_meta_boxes();
1203
1204	$wp_post_types[ $post_type ] = $post_type_object;
1205
1206	$post_type_object->add_hooks();
1207	$post_type_object->register_taxonomies();
1208
1209	/**
1210	* Fires after a post type is registered.
1211	*
1212	* @since 3.3.0
1213	* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
1214	*
1215	* @param string $post_type Post type.
1216	* @param WP_Post_Type $post_type_object Arguments used to register the post type.
1217	*/
1218	do_action( 'registered_post_type', $post_type, $post_type_object );
1219
1220	return $post_type_object;
1221	}
1222
1223	/**
1224	* Unregisters a post type.
1225	*
1226	* Can not be used to unregister built-in post types.
1227	*
1228	* @since 4.5.0
1229	*
1230	* @global array $wp_post_types List of post types.
1231	*
1232	* @param string $post_type Post type to unregister.
1233	* @return bool\|WP_Error True on success, WP_Error on failure or if the post type doesn't exist.
1234	*/
1235	function unregister_post_type( $post_type ) {
1236	global $wp_post_types;
1237
1238	if ( ! post_type_exists( $post_type ) ) {
1239	return new WP_Error( 'invalid_post_type', __( 'Invalid post type.' ) );
1240	}
1241
1242	$post_type_object = get_post_type_object( $post_type );
1243
1244	// Do not allow unregistering internal post types.
1245	if ( $post_type_object->_builtin ) {
1246	return new WP_Error( 'invalid_post_type', __( 'Unregistering a built-in post type is not allowed' ) );
1247	}
1248
1249	$post_type_object->remove_supports();
1250	$post_type_object->remove_rewrite_rules();
1251	$post_type_object->unregister_meta_boxes();
1252	$post_type_object->remove_hooks();
1253	$post_type_object->unregister_taxonomies();
1254
1255	unset( $wp_post_types[ $post_type ] );
1256
1257	/**
1258	* Fires after a post type was unregistered.
1259	*
1260	* @since 4.5.0
1261	*
1262	* @param string $post_type Post type key.
1263	*/
1264	do_action( 'unregistered_post_type', $post_type );
1265
1266	return true;
1267	}
1268
1269	/**
1270	* Build an object with all post type capabilities out of a post type object
1271	*
1272	* Post type capabilities use the 'capability_type' argument as a base, if the
1273	* capability is not set in the 'capabilities' argument array or if the
1274	* 'capabilities' argument is not supplied.
1275	*
1276	* The capability_type argument can optionally be registered as an array, with
1277	* the first value being singular and the second plural, e.g. array('story, 'stories')
1278	* Otherwise, an 's' will be added to the value for the plural form. After
1279	* registration, capability_type will always be a string of the singular value.
1280	*
1281	* By default, seven keys are accepted as part of the capabilities array:
1282	*
1283	* - edit_post, read_post, and delete_post are meta capabilities, which are then
1284	* generally mapped to corresponding primitive capabilities depending on the
1285	* context, which would be the post being edited/read/deleted and the user or
1286	* role being checked. Thus these capabilities would generally not be granted
1287	* directly to users or roles.
1288	*
1289	* - edit_posts - Controls whether objects of this post type can be edited.
1290	* - edit_others_posts - Controls whether objects of this type owned by other users
1291	* can be edited. If the post type does not support an author, then this will
1292	* behave like edit_posts.
1293	* - publish_posts - Controls publishing objects of this post type.
1294	* - read_private_posts - Controls whether private objects can be read.
1295	*
1296	* These four primitive capabilities are checked in core in various locations.
1297	* There are also seven other primitive capabilities which are not referenced
1298	* directly in core, except in map_meta_cap(), which takes the three aforementioned
1299	* meta capabilities and translates them into one or more primitive capabilities
1300	* that must then be checked against the user or role, depending on the context.
1301	*
1302	* - read - Controls whether objects of this post type can be read.
1303	* - delete_posts - Controls whether objects of this post type can be deleted.
1304	* - delete_private_posts - Controls whether private objects can be deleted.
1305	* - delete_published_posts - Controls whether published objects can be deleted.
1306	* - delete_others_posts - Controls whether objects owned by other users can be
1307	* can be deleted. If the post type does not support an author, then this will
1308	* behave like delete_posts.
1309	* - edit_private_posts - Controls whether private objects can be edited.
1310	* - edit_published_posts - Controls whether published objects can be edited.
1311	*
1312	* These additional capabilities are only used in map_meta_cap(). Thus, they are
1313	* only assigned by default if the post type is registered with the 'map_meta_cap'
1314	* argument set to true (default is false).
1315	*
1316	* @since 3.0.0
1317	*
1318	* @see register_post_type()
1319	* @see map_meta_cap()
1320	*
1321	* @param object $args Post type registration arguments.
1322	* @return object Object with all the capabilities as member variables.
1323	*/
1324	function get_post_type_capabilities( $args ) {
1325	if ( ! is_array( $args->capability_type ) )
1326	$args->capability_type = array( $args->capability_type, $args->capability_type . 's' );
1327
1328	// Singular base for meta capabilities, plural base for primitive capabilities.
1329	list( $singular_base, $plural_base ) = $args->capability_type;
1330
1331	$default_capabilities = array(
1332	// Meta capabilities
1333	'edit_post' => 'edit_' . $singular_base,
1334	'read_post' => 'read_' . $singular_base,
1335	'delete_post' => 'delete_' . $singular_base,
1336	// Primitive capabilities used outside of map_meta_cap():
1337	'edit_posts' => 'edit_' . $plural_base,
1338	'edit_others_posts' => 'edit_others_' . $plural_base,
1339	'publish_posts' => 'publish_' . $plural_base,
1340	'read_private_posts' => 'read_private_' . $plural_base,
1341	);
1342
1343	// Primitive capabilities used within map_meta_cap():
1344	if ( $args->map_meta_cap ) {
1345	$default_capabilities_for_mapping = array(
1346	'read' => 'read',
1347	'delete_posts' => 'delete_' . $plural_base,
1348	'delete_private_posts' => 'delete_private_' . $plural_base,
1349	'delete_published_posts' => 'delete_published_' . $plural_base,
1350	'delete_others_posts' => 'delete_others_' . $plural_base,
1351	'edit_private_posts' => 'edit_private_' . $plural_base,
1352	'edit_published_posts' => 'edit_published_' . $plural_base,
1353	);
1354	$default_capabilities = array_merge( $default_capabilities, $default_capabilities_for_mapping );
1355	}
1356
1357	$capabilities = array_merge( $default_capabilities, $args->capabilities );
1358
1359	// Post creation capability simply maps to edit_posts by default:
1360	if ( ! isset( $capabilities['create_posts'] ) )
1361	$capabilities['create_posts'] = $capabilities['edit_posts'];
1362
1363	// Remember meta capabilities for future reference.
1364	if ( $args->map_meta_cap )
1365	_post_type_meta_capabilities( $capabilities );
1366
1367	return (object) $capabilities;
1368	}
1369
1370	/**
1371	* Store or return a list of post type meta caps for map_meta_cap().
1372	*
1373	* @since 3.1.0
1374	* @access private
1375	*
1376	* @global array $post_type_meta_caps Used to store meta capabilities.
1377	*
1378	* @param array $capabilities Post type meta capabilities.
1379	*/
1380	function _post_type_meta_capabilities( $capabilities = null ) {
1381	global $post_type_meta_caps;
1382
1383	foreach ( $capabilities as $core => $custom ) {
1384	if ( in_array( $core, array( 'read_post', 'delete_post', 'edit_post' ) ) ) {
1385	$post_type_meta_caps[ $custom ] = $core;
1386	}
1387	}
1388	}
1389
1390	/**
1391	* Builds an object with all post type labels out of a post type object.
1392	*
1393	* Accepted keys of the label array in the post type object:
1394	*
1395	* - `name` - General name for the post type, usually plural. The same and overridden
1396	* by `$post_type_object->label`. Default is 'Posts' / 'Pages'.
1397	* - `singular_name` - Name for one object of this post type. Default is 'Post' / 'Page'.
1398	* - `add_new` - Default is 'Add New' for both hierarchical and non-hierarchical types.
1399	* When internationalizing this string, please use a {@link https://codex.wordpress.org/I18n_for_WordPress_Developers#Disambiguation_by_context gettext context}
1400	* matching your post type. Example: `_x( 'Add New', 'product', 'textdomain' );`.
1401	* - `add_new_item` - Label for adding a new singular item. Default is 'Add New Post' / 'Add New Page'.
1402	* - `edit_item` - Label for editing a singular item. Default is 'Edit Post' / 'Edit Page'.
1403	* - `new_item` - Label for the new item page title. Default is 'New Post' / 'New Page'.
1404	* - `view_item` - Label for viewing a singular item. Default is 'View Post' / 'View Page'.
1405	* - `view_items` - Label for viewing post type archives. Default is 'View Posts' / 'View Pages'.
1406	* - `search_items` - Label for searching plural items. Default is 'Search Posts' / 'Search Pages'.
1407	* - `not_found` - Label used when no items are found. Default is 'No posts found' / 'No pages found'.
1408	* - `not_found_in_trash` - Label used when no items are in the trash. Default is 'No posts found in Trash' /
1409	* 'No pages found in Trash'.
1410	* - `parent_item_colon` - Label used to prefix parents of hierarchical items. Not used on non-hierarchical
1411	* post types. Default is 'Parent Page:'.
1412	* - `all_items` - Label to signify all items in a submenu link. Default is 'All Posts' / 'All Pages'.
1413	* - `archives` - Label for archives in nav menus. Default is 'Post Archives' / 'Page Archives'.
1414	* - `attributes` - Label for the attributes meta box. Default is 'Post Attributes' / 'Page Attributes'.
1415	* - `insert_into_item` - Label for the media frame button. Default is 'Insert into post' / 'Insert into page'.
1416	* - `uploaded_to_this_item` - Label for the media frame filter. Default is 'Uploaded to this post' /
1417	* 'Uploaded to this page'.
1418	* - `featured_image` - Label for the Featured Image meta box title. Default is 'Featured Image'.
1419	* - `set_featured_image` - Label for setting the featured image. Default is 'Set featured image'.
1420	* - `remove_featured_image` - Label for removing the featured image. Default is 'Remove featured image'.
1421	* - `use_featured_image` - Label in the media frame for using a featured image. Default is 'Use as featured image'.
1422	* - `menu_name` - Label for the menu name. Default is the same as `name`.
1423	* - `filter_items_list` - Label for the table views hidden heading. Default is 'Filter posts list' /
1424	* 'Filter pages list'.
1425	* - `items_list_navigation` - Label for the table pagination hidden heading. Default is 'Posts list navigation' /
1426	* 'Pages list navigation'.
1427	* - `items_list` - Label for the table hidden heading. Default is 'Posts list' / 'Pages list'.
1428	*
1429	* Above, the first default value is for non-hierarchical post types (like posts)
1430	* and the second one is for hierarchical post types (like pages).
1431	*
1432	* Note: To set labels used in post type admin notices, see the {@see 'post_updated_messages'} filter.
1433	*
1434	* @since 3.0.0
1435	* @since 4.3.0 Added the `featured_image`, `set_featured_image`, `remove_featured_image`,
1436	* and `use_featured_image` labels.
1437	* @since 4.4.0 Added the `archives`, `insert_into_item`, `uploaded_to_this_item`, `filter_items_list`,
1438	* `items_list_navigation`, and `items_list` labels.
1439	* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
1440	* @since 4.7.0 Added the `view_items` and `attributes` labels.
1441	*
1442	* @access private
1443	*
1444	* @param object\|WP_Post_Type $post_type_object Post type object.
1445	* @return object Object with all the labels as member variables.
1446	*/
1447	function get_post_type_labels( $post_type_object ) {
1448	$nohier_vs_hier_defaults = array(
1449	'name' => array( _x('Posts', 'post type general name'), _x('Pages', 'post type general name') ),
1450	'singular_name' => array( _x('Post', 'post type singular name'), _x('Page', 'post type singular name') ),
1451	'add_new' => array( _x('Add New', 'post'), _x('Add New', 'page') ),
1452	'add_new_item' => array( __('Add New Post'), __('Add New Page') ),
1453	'edit_item' => array( __('Edit Post'), __('Edit Page') ),
1454	'new_item' => array( __('New Post'), __('New Page') ),
1455	'view_item' => array( __('View Post'), __('View Page') ),
1456	'view_items' => array( __('View Posts'), __('View Pages') ),
1457	'search_items' => array( __('Search Posts'), __('Search Pages') ),
1458	'not_found' => array( __('No posts found.'), __('No pages found.') ),
1459	'not_found_in_trash' => array( __('No posts found in Trash.'), __('No pages found in Trash.') ),
1460	'parent_item_colon' => array( null, __('Parent Page:') ),
1461	'all_items' => array( __( 'All Posts' ), __( 'All Pages' ) ),
1462	'archives' => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
1463	'attributes' => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
1464	'insert_into_item' => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
1465	'uploaded_to_this_item' => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
1466	'featured_image' => array( _x( 'Featured Image', 'post' ), _x( 'Featured Image', 'page' ) ),
1467	'set_featured_image' => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
1468	'remove_featured_image' => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
1469	'use_featured_image' => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
1470	'filter_items_list' => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
1471	'items_list_navigation' => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
1472	'items_list' => array( __( 'Posts list' ), __( 'Pages list' ) ),
1473	);
1474	$nohier_vs_hier_defaults['menu_name'] = $nohier_vs_hier_defaults['name'];
1475
1476	$labels = _get_custom_object_labels( $post_type_object, $nohier_vs_hier_defaults );
1477
1478	$post_type = $post_type_object->name;
1479
1480	$default_labels = clone $labels;
1481
1482	/**
1483	* Filters the labels of a specific post type.
1484	*
1485	* The dynamic portion of the hook name, `$post_type`, refers to
1486	* the post type slug.
1487	*
1488	* @since 3.5.0
1489	*
1490	* @see get_post_type_labels() for the full list of labels.
1491	*
1492	* @param object $labels Object with labels for the post type as member variables.
1493	*/
1494	$labels = apply_filters( "post_type_labels_{$post_type}", $labels );
1495
1496	// Ensure that the filtered labels contain all required default values.
1497	$labels = (object) array_merge( (array) $default_labels, (array) $labels );
1498
1499	return $labels;
1500	}
1501
1502	/**
1503	* Build an object with custom-something object (post type, taxonomy) labels
1504	* out of a custom-something object
1505	*
1506	* @since 3.0.0
1507	* @access private
1508	*
1509	* @param object $object A custom-something object.
1510	* @param array $nohier_vs_hier_defaults Hierarchical vs non-hierarchical default labels.
1511	* @return object Object containing labels for the given custom-something object.
1512	*/
1513	function _get_custom_object_labels( $object, $nohier_vs_hier_defaults ) {
1514	$object->labels = (array) $object->labels;
1515
1516	if ( isset( $object->label ) && empty( $object->labels['name'] ) )
1517	$object->labels['name'] = $object->label;
1518
1519	if ( !isset( $object->labels['singular_name'] ) && isset( $object->labels['name'] ) )
1520	$object->labels['singular_name'] = $object->labels['name'];
1521
1522	if ( ! isset( $object->labels['name_admin_bar'] ) )
1523	$object->labels['name_admin_bar'] = isset( $object->labels['singular_name'] ) ? $object->labels['singular_name'] : $object->name;
1524
1525	if ( !isset( $object->labels['menu_name'] ) && isset( $object->labels['name'] ) )
1526	$object->labels['menu_name'] = $object->labels['name'];
1527
1528	if ( !isset( $object->labels['all_items'] ) && isset( $object->labels['menu_name'] ) )
1529	$object->labels['all_items'] = $object->labels['menu_name'];
1530
1531	if ( !isset( $object->labels['archives'] ) && isset( $object->labels['all_items'] ) ) {
1532	$object->labels['archives'] = $object->labels['all_items'];
1533	}
1534
1535	$defaults = array();
1536	foreach ( $nohier_vs_hier_defaults as $key => $value ) {
1537	$defaults[$key] = $object->hierarchical ? $value[1] : $value[0];
1538	}
1539	$labels = array_merge( $defaults, $object->labels );
1540	$object->labels = (object) $object->labels;
1541
1542	return (object) $labels;
1543	}
1544
1545	/**
1546	* Add submenus for post types.
1547	*
1548	* @access private
1549	* @since 3.1.0
1550	*/
1551	function _add_post_type_submenus() {
1552	foreach ( get_post_types( array( 'show_ui' => true ) ) as $ptype ) {
1553	$ptype_obj = get_post_type_object( $ptype );
1554	// Sub-menus only.
1555	if ( ! $ptype_obj->show_in_menu \|\| $ptype_obj->show_in_menu === true )
1556	continue;
1557	add_submenu_page( $ptype_obj->show_in_menu, $ptype_obj->labels->name, $ptype_obj->labels->all_items, $ptype_obj->cap->edit_posts, "edit.php?post_type=$ptype" );
1558	}
1559	}
1560
1561	/**
1562	* Register support of certain features for a post type.
1563	*
1564	* All core features are directly associated with a functional area of the edit
1565	* screen, such as the editor or a meta box. Features include: 'title', 'editor',
1566	* 'comments', 'revisions', 'trackbacks', 'author', 'excerpt', 'page-attributes',
1567	* 'thumbnail', 'custom-fields', and 'post-formats'.
1568	*
1569	* Additionally, the 'revisions' feature dictates whether the post type will
1570	* store revisions, and the 'comments' feature dictates whether the comments
1571	* count will show on the edit screen.
1572	*
1573	* @since 3.0.0
1574	*
1575	* @global array $_wp_post_type_features
1576	*
1577	* @param string $post_type The post type for which to add the feature.
1578	* @param string\|array $feature The feature being added, accepts an array of
1579	* feature strings or a single string.
1580	*/
1581	function add_post_type_support( $post_type, $feature ) {
1582	global $_wp_post_type_features;
1583
1584	$features = (array) $feature;
1585	foreach ($features as $feature) {
1586	if ( func_num_args() == 2 )
1587	$_wp_post_type_features[$post_type][$feature] = true;
1588	else
1589	$_wp_post_type_features[$post_type][$feature] = array_slice( func_get_args(), 2 );
1590	}
1591	}
1592
1593	/**
1594	* Remove support for a feature from a post type.
1595	*
1596	* @since 3.0.0
1597	*
1598	* @global array $_wp_post_type_features
1599	*
1600	* @param string $post_type The post type for which to remove the feature.
1601	* @param string $feature The feature being removed.
1602	*/
1603	function remove_post_type_support( $post_type, $feature ) {
1604	global $_wp_post_type_features;
1605
1606	unset( $_wp_post_type_features[ $post_type ][ $feature ] );
1607	}
1608
1609	/**
1610	* Get all the post type features
1611	*
1612	* @since 3.4.0
1613	*
1614	* @global array $_wp_post_type_features
1615	*
1616	* @param string $post_type The post type.
1617	* @return array Post type supports list.
1618	*/
1619	function get_all_post_type_supports( $post_type ) {
1620	global $_wp_post_type_features;
1621
1622	if ( isset( $_wp_post_type_features[$post_type] ) )
1623	return $_wp_post_type_features[$post_type];
1624
1625	return array();
1626	}
1627
1628	/**
1629	* Check a post type's support for a given feature.
1630	*
1631	* @since 3.0.0
1632	*
1633	* @global array $_wp_post_type_features
1634	*
1635	* @param string $post_type The post type being checked.
1636	* @param string $feature The feature being checked.
1637	* @return bool Whether the post type supports the given feature.
1638	*/
1639	function post_type_supports( $post_type, $feature ) {
1640	global $_wp_post_type_features;
1641
1642	return ( isset( $_wp_post_type_features[$post_type][$feature] ) );
1643	}
1644
1645	/**
1646	* Retrieves a list of post type names that support a specific feature.
1647	*
1648	* @since 4.5.0
1649	*
1650	* @global array $_wp_post_type_features Post type features
1651	*
1652	* @param array\|string $feature Single feature or an array of features the post types should support.
1653	* @param string $operator Optional. The logical operation to perform. 'or' means
1654	* only one element from the array needs to match; 'and'
1655	* means all elements must match; 'not' means no elements may
1656	* match. Default 'and'.
1657	* @return array A list of post type names.
1658	*/
1659	function get_post_types_by_support( $feature, $operator = 'and' ) {
1660	global $_wp_post_type_features;
1661
1662	$features = array_fill_keys( (array) $feature, true );
1663
1664	return array_keys( wp_filter_object_list( $_wp_post_type_features, $features, $operator ) );
1665	}
1666
1667	/**
1668	* Update the post type for the post ID.
1669	*
1670	* The page or post cache will be cleaned for the post ID.
1671	*
1672	* @since 2.5.0
1673	*
1674	* @global wpdb $wpdb WordPress database abstraction object.
1675	*
1676	* @param int $post_id Optional. Post ID to change post type. Default 0.
1677	* @param string $post_type Optional. Post type. Accepts 'post' or 'page' to
1678	* name a few. Default 'post'.
1679	* @return int\|false Amount of rows changed. Should be 1 for success and 0 for failure.
1680	*/
1681	function set_post_type( $post_id = 0, $post_type = 'post' ) {
1682	global $wpdb;
1683
1684	$post_type = sanitize_post_field('post_type', $post_type, $post_id, 'db');
1685	$return = $wpdb->update( $wpdb->posts, array('post_type' => $post_type), array('ID' => $post_id) );
1686
1687	clean_post_cache( $post_id );
1688
1689	return $return;
1690	}
1691
1692	/**
1693	* Determines whether a post type is considered "viewable".
1694	*
1695	* For built-in post types such as posts and pages, the 'public' value will be evaluated.
1696	* For all others, the 'publicly_queryable' value will be used.
1697	*
1698	* @since 4.4.0
1699	* @since 4.5.0 Added the ability to pass a post type name in addition to object.
1700	* @since 4.6.0 Converted the `$post_type` parameter to accept a WP_Post_Type object.
1701	*
1702	* @param string\|WP_Post_Type $post_type Post type name or object.
1703	* @return bool Whether the post type should be considered viewable.
1704	*/
1705	function is_post_type_viewable( $post_type ) {
1706	if ( is_scalar( $post_type ) ) {
1707	$post_type = get_post_type_object( $post_type );
1708	if ( ! $post_type ) {
1709	return false;
1710	}
1711	}
1712
1713	return $post_type->publicly_queryable \|\| ( $post_type->_builtin && $post_type->public );
1714	}
1715
1716	/**
1717	* Retrieve list of latest posts or posts matching criteria.
1718	*
1719	* The defaults are as follows:
1720	*
1721	* @since 1.2.0
1722	*
1723	* @see WP_Query::parse_query()
1724	*
1725	* @param array $args {
1726	* Optional. Arguments to retrieve posts. See WP_Query::parse_query() for all
1727	* available arguments.
1728	*
1729	* @type int $numberposts Total number of posts to retrieve. Is an alias of $posts_per_page
1730	* in WP_Query. Accepts -1 for all. Default 5.
1731	* @type int\|string $category Category ID or comma-separated list of IDs (this or any children).
1732	* Is an alias of $cat in WP_Query. Default 0.
1733	* @type array $include An array of post IDs to retrieve, sticky posts will be included.
1734	* Is an alias of $post__in in WP_Query. Default empty array.
1735	* @type array $exclude An array of post IDs not to retrieve. Default empty array.
1736	* @type bool $suppress_filters Whether to suppress filters. Default true.
1737	* }
1738	* @return array List of posts.
1739	*/
1740	function get_posts( $args = null ) {
1741	$defaults = array(
1742	'numberposts' => 5,
1743	'category' => 0, 'orderby' => 'date',
1744	'order' => 'DESC', 'include' => array(),
1745	'exclude' => array(), 'meta_key' => '',
1746	'meta_value' =>'', 'post_type' => 'post',
1747	'suppress_filters' => true
1748	);
1749
1750	$r = wp_parse_args( $args, $defaults );
1751	if ( empty( $r['post_status'] ) )
1752	$r['post_status'] = ( 'attachment' == $r['post_type'] ) ? 'inherit' : 'publish';
1753	if ( ! empty($r['numberposts']) && empty($r['posts_per_page']) )
1754	$r['posts_per_page'] = $r['numberposts'];
1755	if ( ! empty($r['category']) )
1756	$r['cat'] = $r['category'];
1757	if ( ! empty($r['include']) ) {
1758	$incposts = wp_parse_id_list( $r['include'] );
1759	$r['posts_per_page'] = count($incposts); // only the number of posts included
1760	$r['post__in'] = $incposts;
1761	} elseif ( ! empty($r['exclude']) )
1762	$r['post__not_in'] = wp_parse_id_list( $r['exclude'] );
1763
1764	$r['ignore_sticky_posts'] = true;
1765	$r['no_found_rows'] = true;
1766
1767	$get_posts = new WP_Query;
1768	return $get_posts->query($r);
1769
1770	}
1771
1772	//
1773	// Post meta functions
1774	//
1775
1776	/**
1777	* Add meta data field to a post.
1778	*
1779	* Post meta data is called "Custom Fields" on the Administration Screen.
1780	*
1781	* @since 1.5.0
1782	*
1783	* @param int $post_id Post ID.
1784	* @param string $meta_key Metadata name.
1785	* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
1786	* @param bool $unique Optional. Whether the same key should not be added.
1787	* Default false.
1788	* @return int\|false Meta ID on success, false on failure.
1789	*/
1790	function add_post_meta( $post_id, $meta_key, $meta_value, $unique = false ) {
1791	// Make sure meta is added to the post, not a revision.
1792	if ( $the_post = wp_is_post_revision($post_id) )
1793	$post_id = $the_post;
1794
1795	$added = add_metadata( 'post', $post_id, $meta_key, $meta_value, $unique );
1796	if ( $added ) {
1797	wp_cache_set( 'last_changed', microtime(), 'posts' );
1798	}
1799	return $added;
1800	}
1801
1802	/**
1803	* Remove metadata matching criteria from a post.
1804	*
1805	* You can match based on the key, or key and value. Removing based on key and
1806	* value, will keep from removing duplicate metadata with the same key. It also
1807	* allows removing all metadata matching key, if needed.
1808	*
1809	* @since 1.5.0
1810	*
1811	* @param int $post_id Post ID.
1812	* @param string $meta_key Metadata name.
1813	* @param mixed $meta_value Optional. Metadata value. Must be serializable if
1814	* non-scalar. Default empty.
1815	* @return bool True on success, false on failure.
1816	*/
1817	function delete_post_meta( $post_id, $meta_key, $meta_value = '' ) {
1818	// Make sure meta is added to the post, not a revision.
1819	if ( $the_post = wp_is_post_revision($post_id) )
1820	$post_id = $the_post;
1821
1822	$deleted = delete_metadata( 'post', $post_id, $meta_key, $meta_value );
1823	if ( $deleted ) {
1824	wp_cache_set( 'last_changed', microtime(), 'posts' );
1825	}
1826	return $deleted;
1827	}
1828
1829	/**
1830	* Retrieve post meta field for a post.
1831	*
1832	* @since 1.5.0
1833	*
1834	* @param int $post_id Post ID.
1835	* @param string $key Optional. The meta key to retrieve. By default, returns
1836	* data for all keys. Default empty.
1837	* @param bool $single Optional. Whether to return a single value. Default false.
1838	* @return mixed Will be an array if $single is false. Will be value of meta data
1839	* field if $single is true.
1840	*/
1841	function get_post_meta( $post_id, $key = '', $single = false ) {
1842	return get_metadata('post', $post_id, $key, $single);
1843	}
1844
1845	/**
1846	* Update post meta field based on post ID.
1847	*
1848	* Use the $prev_value parameter to differentiate between meta fields with the
1849	* same key and post ID.
1850	*
1851	* If the meta field for the post does not exist, it will be added.
1852	*
1853	* @since 1.5.0
1854	*
1855	* @param int $post_id Post ID.
1856	* @param string $meta_key Metadata key.
1857	* @param mixed $meta_value Metadata value. Must be serializable if non-scalar.
1858	* @param mixed $prev_value Optional. Previous value to check before removing.
1859	* Default empty.
1860	* @return int\|bool Meta ID if the key didn't exist, true on successful update,
1861	* false on failure.
1862	*/
1863	function update_post_meta( $post_id, $meta_key, $meta_value, $prev_value = '' ) {
1864	// Make sure meta is added to the post, not a revision.
1865	if ( $the_post = wp_is_post_revision($post_id) )
1866	$post_id = $the_post;
1867
1868	$updated = update_metadata( 'post', $post_id, $meta_key, $meta_value, $prev_value );
1869	if ( $updated ) {
1870	wp_cache_set( 'last_changed', microtime(), 'posts' );
1871	}
1872	return $updated;
1873	}
1874
1875	/**
1876	* Delete everything from post meta matching meta key.
1877	*
1878	* @since 2.3.0
1879	*
1880	* @param string $post_meta_key Key to search for when deleting.
1881	* @return bool Whether the post meta key was deleted from the database.
1882	*/
1883	function delete_post_meta_by_key( $post_meta_key ) {
1884	$deleted = delete_metadata( 'post', null, $post_meta_key, '', true );
1885	if ( $deleted ) {
1886	wp_cache_set( 'last_changed', microtime(), 'posts' );
1887	}
1888	return $deleted;
1889	}
1890
1891	/**
1892	* Registers a meta key for posts.
1893	*
1894	* @since 4.9.8
1895	*
1896	* @param string $post_type Post type to register a meta key for. Pass an empty string
1897	* to register the meta key across all existing post types.
1898	* @param string $meta_key The meta key to register.
1899	* @param array $args Data used to describe the meta key when registered. See
1900	* {@see register_meta()} for a list of supported arguments.
1901	* @return bool True if the meta key was successfully registered, false if not.
1902	*/
1903	function register_post_meta( $post_type, $meta_key, array $args ) {
1904	$args['object_subtype'] = $post_type;
1905
1906	return register_meta( 'post', $meta_key, $args );
1907	}
1908
1909	/**
1910	* Unregisters a meta key for posts.
1911	*
1912	* @since 4.9.8
1913	*
1914	* @param string $post_type Post type the meta key is currently registered for. Pass
1915	* an empty string if the meta key is registered across all
1916	* existing post types.
1917	* @param string $meta_key The meta key to unregister.
1918	* @return bool True on success, false if the meta key was not previously registered.
1919	*/
1920	function unregister_post_meta( $post_type, $meta_key ) {
1921	return unregister_meta_key( 'post', $meta_key, $post_type );
1922	}
1923
1924	/**
1925	* Retrieve post meta fields, based on post ID.
1926	*
1927	* The post meta fields are retrieved from the cache where possible,
1928	* so the function is optimized to be called more than once.
1929	*
1930	* @since 1.2.0
1931	*
1932	* @param int $post_id Optional. Post ID. Default is ID of the global $post.
1933	* @return array Post meta for the given post.
1934	*/
1935	function get_post_custom( $post_id = 0 ) {
1936	$post_id = absint( $post_id );
1937	if ( ! $post_id )
1938	$post_id = get_the_ID();
1939
1940	return get_post_meta( $post_id );
1941	}
1942
1943	/**
1944	* Retrieve meta field names for a post.
1945	*
1946	* If there are no meta fields, then nothing (null) will be returned.
1947	*
1948	* @since 1.2.0
1949	*
1950	* @param int $post_id Optional. Post ID. Default is ID of the global $post.
1951	* @return array\|void Array of the keys, if retrieved.
1952	*/
1953	function get_post_custom_keys( $post_id = 0 ) {
1954	$custom = get_post_custom( $post_id );
1955
1956	if ( !is_array($custom) )
1957	return;
1958
1959	if ( $keys = array_keys($custom) )
1960	return $keys;
1961	}
1962
1963	/**
1964	* Retrieve values for a custom post field.
1965	*
1966	* The parameters must not be considered optional. All of the post meta fields
1967	* will be retrieved and only the meta field key values returned.
1968	*
1969	* @since 1.2.0
1970	*
1971	* @param string $key Optional. Meta field key. Default empty.
1972	* @param int $post_id Optional. Post ID. Default is ID of the global $post.
1973	* @return array\|null Meta field values.
1974	*/
1975	function get_post_custom_values( $key = '', $post_id = 0 ) {
1976	if ( !$key )
1977	return null;
1978
1979	$custom = get_post_custom($post_id);
1980
1981	return isset($custom[$key]) ? $custom[$key] : null;
1982	}
1983
1984	/**
1985	* Check if post is sticky.
1986	*
1987	* Sticky posts should remain at the top of The Loop. If the post ID is not
1988	* given, then The Loop ID for the current post will be used.
1989	*
1990	* @since 2.7.0
1991	*
1992	* @param int $post_id Optional. Post ID. Default is ID of the global $post.
1993	* @return bool Whether post is sticky.
1994	*/
1995	function is_sticky( $post_id = 0 ) {
1996	$post_id = absint( $post_id );
1997
1998	if ( ! $post_id )
1999	$post_id = get_the_ID();
2000
2001	$stickies = get_option( 'sticky_posts' );
2002
2003	if ( ! is_array( $stickies ) )
2004	return false;
2005
2006	if ( in_array( $post_id, $stickies ) )
2007	return true;
2008
2009	return false;
2010	}
2011
2012	/**
2013	* Sanitize every post field.
2014	*
2015	* If the context is 'raw', then the post object or array will get minimal
2016	* sanitization of the integer fields.
2017	*
2018	* @since 2.3.0
2019	*
2020	* @see sanitize_post_field()
2021	*
2022	* @param object\|WP_Post\|array $post The Post Object or Array
2023	* @param string $context Optional. How to sanitize post fields.
2024	* Accepts 'raw', 'edit', 'db', or 'display'.
2025	* Default 'display'.
2026	* @return object\|WP_Post\|array The now sanitized Post Object or Array (will be the
2027	* same type as $post).
2028	*/
2029	function sanitize_post( $post, $context = 'display' ) {
2030	if ( is_object($post) ) {
2031	// Check if post already filtered for this context.
2032	if ( isset($post->filter) && $context == $post->filter )
2033	return $post;
2034	if ( !isset($post->ID) )
2035	$post->ID = 0;
2036	foreach ( array_keys(get_object_vars($post)) as $field )
2037	$post->$field = sanitize_post_field($field, $post->$field, $post->ID, $context);
2038	$post->filter = $context;
2039	} elseif ( is_array( $post ) ) {
2040	// Check if post already filtered for this context.
2041	if ( isset($post['filter']) && $context == $post['filter'] )
2042	return $post;
2043	if ( !isset($post['ID']) )
2044	$post['ID'] = 0;
2045	foreach ( array_keys($post) as $field )
2046	$post[$field] = sanitize_post_field($field, $post[$field], $post['ID'], $context);
2047	$post['filter'] = $context;
2048	}
2049	return $post;
2050	}
2051
2052	/**
2053	* Sanitize post field based on context.
2054	*
2055	* Possible context values are: 'raw', 'edit', 'db', 'display', 'attribute' and
2056	* 'js'. The 'display' context is used by default. 'attribute' and 'js' contexts
2057	* are treated like 'display' when calling filters.
2058	*
2059	* @since 2.3.0
2060	* @since 4.4.0 Like `sanitize_post()`, `$context` defaults to 'display'.
2061	*
2062	* @param string $field The Post Object field name.
2063	* @param mixed $value The Post Object value.
2064	* @param int $post_id Post ID.
2065	* @param string $context Optional. How to sanitize post fields. Looks for 'raw', 'edit',
2066	* 'db', 'display', 'attribute' and 'js'. Default 'display'.
2067	* @return mixed Sanitized value.
2068	*/
2069	function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
2070	$int_fields = array('ID', 'post_parent', 'menu_order');
2071	if ( in_array($field, $int_fields) )
2072	$value = (int) $value;
2073
2074	// Fields which contain arrays of integers.
2075	$array_int_fields = array( 'ancestors' );
2076	if ( in_array($field, $array_int_fields) ) {
2077	$value = array_map( 'absint', $value);
2078	return $value;
2079	}
2080
2081	if ( 'raw' == $context )
2082	return $value;
2083
2084	$prefixed = false;
2085	if ( false !== strpos($field, 'post_') ) {
2086	$prefixed = true;
2087	$field_no_prefix = str_replace('post_', '', $field);
2088	}
2089
2090	if ( 'edit' == $context ) {
2091	$format_to_edit = array('post_content', 'post_excerpt', 'post_title', 'post_password');
2092
2093	if ( $prefixed ) {
2094
2095	/**
2096	* Filters the value of a specific post field to edit.
2097	*
2098	* The dynamic portion of the hook name, `$field`, refers to the post
2099	* field name.
2100	*
2101	* @since 2.3.0
2102	*
2103	* @param mixed $value Value of the post field.
2104	* @param int $post_id Post ID.
2105	*/
2106	$value = apply_filters( "edit_{$field}", $value, $post_id );
2107
2108	/**
2109	* Filters the value of a specific post field to edit.
2110	*
2111	* The dynamic portion of the hook name, `$field_no_prefix`, refers to
2112	* the post field name.
2113	*
2114	* @since 2.3.0
2115	*
2116	* @param mixed $value Value of the post field.
2117	* @param int $post_id Post ID.
2118	*/
2119	$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
2120	} else {
2121	$value = apply_filters( "edit_post_{$field}", $value, $post_id );
2122	}
2123
2124	if ( in_array($field, $format_to_edit) ) {
2125	if ( 'post_content' == $field )
2126	$value = format_to_edit($value, user_can_richedit());
2127	else
2128	$value = format_to_edit($value);
2129	} else {
2130	$value = esc_attr($value);
2131	}
2132	} elseif ( 'db' == $context ) {
2133	if ( $prefixed ) {
2134
2135	/**
2136	* Filters the value of a specific post field before saving.
2137	*
2138	* The dynamic portion of the hook name, `$field`, refers to the post
2139	* field name.
2140	*
2141	* @since 2.3.0
2142	*
2143	* @param mixed $value Value of the post field.
2144	*/
2145	$value = apply_filters( "pre_{$field}", $value );
2146
2147	/**
2148	* Filters the value of a specific field before saving.
2149	*
2150	* The dynamic portion of the hook name, `$field_no_prefix`, refers
2151	* to the post field name.
2152	*
2153	* @since 2.3.0
2154	*
2155	* @param mixed $value Value of the post field.
2156	*/
2157	$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
2158	} else {
2159	$value = apply_filters( "pre_post_{$field}", $value );
2160
2161	/**
2162	* Filters the value of a specific post field before saving.
2163	*
2164	* The dynamic portion of the hook name, `$field`, refers to the post
2165	* field name.
2166	*
2167	* @since 2.3.0
2168	*
2169	* @param mixed $value Value of the post field.
2170	*/
2171	$value = apply_filters( "{$field}_pre", $value );
2172	}
2173	} else {
2174
2175	// Use display filters by default.
2176	if ( $prefixed ) {
2177
2178	/**
2179	* Filters the value of a specific post field for display.
2180	*
2181	* The dynamic portion of the hook name, `$field`, refers to the post
2182	* field name.
2183	*
2184	* @since 2.3.0
2185	*
2186	* @param mixed $value Value of the prefixed post field.
2187	* @param int $post_id Post ID.
2188	* @param string $context Context for how to sanitize the field. Possible
2189	* values include 'raw', 'edit', 'db', 'display',
2190	* 'attribute' and 'js'.
2191	*/
2192	$value = apply_filters( "{$field}", $value, $post_id, $context );
2193	} else {
2194	$value = apply_filters( "post_{$field}", $value, $post_id, $context );
2195	}
2196
2197	if ( 'attribute' == $context ) {
2198	$value = esc_attr( $value );
2199	} elseif ( 'js' == $context ) {
2200	$value = esc_js( $value );
2201	}
2202	}
2203
2204	return $value;
2205	}
2206
2207	/**
2208	* Make a post sticky.
2209	*
2210	* Sticky posts should be displayed at the top of the front page.
2211	*
2212	* @since 2.7.0
2213	*
2214	* @param int $post_id Post ID.
2215	*/
2216	function stick_post( $post_id ) {
2217	$stickies = get_option('sticky_posts');
2218
2219	if ( !is_array($stickies) )
2220	$stickies = array($post_id);
2221
2222	if ( ! in_array($post_id, $stickies) )
2223	$stickies[] = $post_id;
2224
2225	$updated = update_option( 'sticky_posts', $stickies );
2226
2227	if ( $updated ) {
2228	/**
2229	* Fires once a post has been added to the sticky list.
2230	*
2231	* @since 4.6.0
2232	*
2233	* @param int $post_id ID of the post that was stuck.
2234	*/
2235	do_action( 'post_stuck', $post_id );
2236	}
2237	}
2238
2239	/**
2240	* Un-stick a post.
2241	*
2242	* Sticky posts should be displayed at the top of the front page.
2243	*
2244	* @since 2.7.0
2245	*
2246	* @param int $post_id Post ID.
2247	*/
2248	function unstick_post( $post_id ) {
2249	$stickies = get_option('sticky_posts');
2250
2251	if ( !is_array($stickies) )
2252	return;
2253
2254	if ( ! in_array($post_id, $stickies) )
2255	return;
2256
2257	$offset = array_search($post_id, $stickies);
2258	if ( false === $offset )
2259	return;
2260
2261	array_splice($stickies, $offset, 1);
2262
2263	$updated = update_option( 'sticky_posts', $stickies );
2264
2265	if ( $updated ) {
2266	/**
2267	* Fires once a post has been removed from the sticky list.
2268	*
2269	* @since 4.6.0
2270	*
2271	* @param int $post_id ID of the post that was unstuck.
2272	*/
2273	do_action( 'post_unstuck', $post_id );
2274	}
2275	}
2276
2277	/**
2278	* Return the cache key for wp_count_posts() based on the passed arguments.
2279	*
2280	* @since 3.9.0
2281	*
2282	* @param string $type Optional. Post type to retrieve count Default 'post'.
2283	* @param string $perm Optional. 'readable' or empty. Default empty.
2284	* @return string The cache key.
2285	*/
2286	function _count_posts_cache_key( $type = 'post', $perm = '' ) {
2287	$cache_key = 'posts-' . $type;
2288	if ( 'readable' == $perm && is_user_logged_in() ) {
2289	$post_type_object = get_post_type_object( $type );
2290	if ( $post_type_object && ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
2291	$cache_key .= '_' . $perm . '_' . get_current_user_id();
2292	}
2293	}
2294	return $cache_key;
2295	}
2296
2297	/**
2298	* Count number of posts of a post type and if user has permissions to view.
2299	*
2300	* This function provides an efficient method of finding the amount of post's
2301	* type a blog has. Another method is to count the amount of items in
2302	* get_posts(), but that method has a lot of overhead with doing so. Therefore,
2303	* when developing for 2.5+, use this function instead.
2304	*
2305	* The $perm parameter checks for 'readable' value and if the user can read
2306	* private posts, it will display that for the user that is signed in.
2307	*
2308	* @since 2.5.0
2309	*
2310	* @global wpdb $wpdb WordPress database abstraction object.
2311	*
2312	* @param string $type Optional. Post type to retrieve count. Default 'post'.
2313	* @param string $perm Optional. 'readable' or empty. Default empty.
2314	* @return object Number of posts for each status.
2315	*/
2316	function wp_count_posts( $type = 'post', $perm = '' ) {
2317	global $wpdb;
2318
2319	if ( ! post_type_exists( $type ) )
2320	return new stdClass;
2321
2322	$cache_key = _count_posts_cache_key( $type, $perm );
2323
2324	$counts = wp_cache_get( $cache_key, 'counts' );
2325	if ( false !== $counts ) {
2326	/** This filter is documented in wp-includes/post.php */
2327	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
2328	}
2329
2330	$query = "SELECT post_status, COUNT( * ) AS num_posts FROM {$wpdb->posts} WHERE post_type = %s";
2331	if ( 'readable' == $perm && is_user_logged_in() ) {
2332	$post_type_object = get_post_type_object($type);
2333	if ( ! current_user_can( $post_type_object->cap->read_private_posts ) ) {
2334	$query .= $wpdb->prepare( " AND (post_status != 'private' OR ( post_author = %d AND post_status = 'private' ))",
2335	get_current_user_id()
2336	);
2337	}
2338	}
2339	$query .= ' GROUP BY post_status';
2340
2341	$results = (array) $wpdb->get_results( $wpdb->prepare( $query, $type ), ARRAY_A );
2342	$counts = array_fill_keys( get_post_stati(), 0 );
2343
2344	foreach ( $results as $row ) {
2345	$counts[ $row['post_status'] ] = $row['num_posts'];
2346	}
2347
2348	$counts = (object) $counts;
2349	wp_cache_set( $cache_key, $counts, 'counts' );
2350
2351	/**
2352	* Modify returned post counts by status for the current post type.
2353	*
2354	* @since 3.7.0
2355	*
2356	* @param object $counts An object containing the current post_type's post
2357	* counts by status.
2358	* @param string $type Post type.
2359	* @param string $perm The permission to determine if the posts are 'readable'
2360	* by the current user.
2361	*/
2362	return apply_filters( 'wp_count_posts', $counts, $type, $perm );
2363	}
2364
2365	/**
2366	* Count number of attachments for the mime type(s).
2367	*
2368	* If you set the optional mime_type parameter, then an array will still be
2369	* returned, but will only have the item you are looking for. It does not give
2370	* you the number of attachments that are children of a post. You can get that
2371	* by counting the number of children that post has.
2372	*
2373	* @since 2.5.0
2374	*
2375	* @global wpdb $wpdb WordPress database abstraction object.
2376	*
2377	* @param string\|array $mime_type Optional. Array or comma-separated list of
2378	* MIME patterns. Default empty.
2379	* @return object An object containing the attachment counts by mime type.
2380	*/
2381	function wp_count_attachments( $mime_type = '' ) {
2382	global $wpdb;
2383
2384	$and = wp_post_mime_type_where( $mime_type );
2385	$count = $wpdb->get_results( "SELECT post_mime_type, COUNT( * ) AS num_posts FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status != 'trash' $and GROUP BY post_mime_type", ARRAY_A );
2386
2387	$counts = array();
2388	foreach ( (array) $count as $row ) {
2389	$counts[ $row['post_mime_type'] ] = $row['num_posts'];
2390	}
2391	$counts['trash'] = $wpdb->get_var( "SELECT COUNT( * ) FROM $wpdb->posts WHERE post_type = 'attachment' AND post_status = 'trash' $and");
2392
2393	/**
2394	* Modify returned attachment counts by mime type.
2395	*
2396	* @since 3.7.0
2397	*
2398	* @param object $counts An object containing the attachment counts by
2399	* mime type.
2400	* @param string $mime_type The mime type pattern used to filter the attachments
2401	* counted.
2402	*/
2403	return apply_filters( 'wp_count_attachments', (object) $counts, $mime_type );
2404	}
2405
2406	/**
2407	* Get default post mime types.
2408	*
2409	* @since 2.9.0
2410	*
2411	* @return array List of post mime types.
2412	*/
2413	function get_post_mime_types() {
2414	$post_mime_types = array( // array( adj, noun )
2415	'image' => array(__('Images'), __('Manage Images'), _n_noop('Image <span class="count">(%s)</span>', 'Images <span class="count">(%s)</span>')),
2416	'audio' => array(__('Audio'), __('Manage Audio'), _n_noop('Audio <span class="count">(%s)</span>', 'Audio <span class="count">(%s)</span>')),
2417	'video' => array(__('Video'), __('Manage Video'), _n_noop('Video <span class="count">(%s)</span>', 'Video <span class="count">(%s)</span>')),
2418	);
2419
2420	/**
2421	* Filters the default list of post mime types.
2422	*
2423	* @since 2.5.0
2424	*
2425	* @param array $post_mime_types Default list of post mime types.
2426	*/
2427	return apply_filters( 'post_mime_types', $post_mime_types );
2428	}
2429
2430	/**
2431	* Check a MIME-Type against a list.
2432	*
2433	* If the wildcard_mime_types parameter is a string, it must be comma separated
2434	* list. If the real_mime_types is a string, it is also comma separated to
2435	* create the list.
2436	*
2437	* @since 2.5.0
2438	*
2439	* @param string\|array $wildcard_mime_types Mime types, e.g. audio/mpeg or image (same as image/*)
2440	* or flash (same as flash).
2441	* @param string\|array $real_mime_types Real post mime type values.
2442	* @return array array(wildcard=>array(real types)).
2443	*/
2444	function wp_match_mime_types( $wildcard_mime_types, $real_mime_types ) {
2445	$matches = array();
2446	if ( is_string( $wildcard_mime_types ) ) {
2447	$wildcard_mime_types = array_map( 'trim', explode( ',', $wildcard_mime_types ) );
2448	}
2449	if ( is_string( $real_mime_types ) ) {
2450	$real_mime_types = array_map( 'trim', explode( ',', $real_mime_types ) );
2451	}
2452
2453	$patternses = array();
2454	$wild = '[-._a-z0-9]*';
2455
2456	foreach ( (array) $wildcard_mime_types as $type ) {
2457	$mimes = array_map( 'trim', explode( ',', $type ) );
2458	foreach ( $mimes as $mime ) {
2459	$regex = str_replace( '__wildcard__', $wild, preg_quote( str_replace( '*', '__wildcard__', $mime ) ) );
2460	$patternses[][$type] = "^$regex$";
2461	if ( false === strpos( $mime, '/' ) ) {
2462	$patternses[][$type] = "^$regex/";
2463	$patternses[][$type] = $regex;
2464	}
2465	}
2466	}
2467	asort( $patternses );
2468
2469	foreach ( $patternses as $patterns ) {
2470	foreach ( $patterns as $type => $pattern ) {
2471	foreach ( (array) $real_mime_types as $real ) {
2472	if ( preg_match( "#$pattern#", $real ) && ( empty( $matches[$type] ) \|\| false === array_search( $real, $matches[$type] ) ) ) {
2473	$matches[$type][] = $real;
2474	}
2475	}
2476	}
2477	}
2478	return $matches;
2479	}
2480
2481	/**
2482	* Convert MIME types into SQL.
2483	*
2484	* @since 2.5.0
2485	*
2486	* @param string\|array $post_mime_types List of mime types or comma separated string
2487	* of mime types.
2488	* @param string $table_alias Optional. Specify a table alias, if needed.
2489	* Default empty.
2490	* @return string The SQL AND clause for mime searching.
2491	*/
2492	function wp_post_mime_type_where( $post_mime_types, $table_alias = '' ) {
2493	$where = '';
2494	$wildcards = array('', '%', '%/%');
2495	if ( is_string($post_mime_types) )
2496	$post_mime_types = array_map('trim', explode(',', $post_mime_types));
2497
2498	$wheres = array();
2499
2500	foreach ( (array) $post_mime_types as $mime_type ) {
2501	$mime_type = preg_replace('/\s/', '', $mime_type);
2502	$slashpos = strpos($mime_type, '/');
2503	if ( false !== $slashpos ) {
2504	$mime_group = preg_replace('/[^-*.a-zA-Z0-9]/', '', substr($mime_type, 0, $slashpos));
2505	$mime_subgroup = preg_replace('/[^-*.+a-zA-Z0-9]/', '', substr($mime_type, $slashpos + 1));
2506	if ( empty($mime_subgroup) )
2507	$mime_subgroup = '*';
2508	else
2509	$mime_subgroup = str_replace('/', '', $mime_subgroup);
2510	$mime_pattern = "$mime_group/$mime_subgroup";
2511	} else {
2512	$mime_pattern = preg_replace('/[^-*.a-zA-Z0-9]/', '', $mime_type);
2513	if ( false === strpos($mime_pattern, '*') )
2514	$mime_pattern .= '/*';
2515	}
2516
2517	$mime_pattern = preg_replace('/\*+/', '%', $mime_pattern);
2518
2519	if ( in_array( $mime_type, $wildcards ) )
2520	return '';
2521
2522	if ( false !== strpos($mime_pattern, '%') )
2523	$wheres[] = empty($table_alias) ? "post_mime_type LIKE '$mime_pattern'" : "$table_alias.post_mime_type LIKE '$mime_pattern'";
2524	else
2525	$wheres[] = empty($table_alias) ? "post_mime_type = '$mime_pattern'" : "$table_alias.post_mime_type = '$mime_pattern'";
2526	}
2527	if ( !empty($wheres) )
2528	$where = ' AND (' . join(' OR ', $wheres) . ') ';
2529	return $where;
2530	}
2531
2532	/**
2533	* Trash or delete a post or page.
2534	*
2535	* When the post and page is permanently deleted, everything that is tied to
2536	* it is deleted also. This includes comments, post meta fields, and terms
2537	* associated with the post.
2538	*
2539	* The post or page is moved to trash instead of permanently deleted unless
2540	* trash is disabled, item is already in the trash, or $force_delete is true.
2541	*
2542	* @since 1.0.0
2543	*
2544	* @global wpdb $wpdb WordPress database abstraction object.
2545	* @see wp_delete_attachment()
2546	* @see wp_trash_post()
2547	*
2548	* @param int $postid Optional. Post ID. Default 0.
2549	* @param bool $force_delete Optional. Whether to bypass trash and force deletion.
2550	* Default false.
2551	* @return WP_Post\|false\|null Post data on success, false or null on failure.
2552	*/
2553	function wp_delete_post( $postid = 0, $force_delete = false ) {
2554	global $wpdb;
2555
2556	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $postid ) );
2557
2558	if ( ! $post ) {
2559	return $post;
2560	}
2561
2562	$post = get_post( $post );
2563
2564	if ( ! $force_delete && ( 'post' === $post->post_type \|\| 'page' === $post->post_type ) && 'trash' !== get_post_status( $postid ) && EMPTY_TRASH_DAYS ) {
2565	return wp_trash_post( $postid );
2566	}
2567
2568	if ( 'attachment' === $post->post_type ) {
2569	return wp_delete_attachment( $postid, $force_delete );
2570	}
2571
2572	/**
2573	* Filters whether a post deletion should take place.
2574	*
2575	* @since 4.4.0
2576	*
2577	* @param bool $delete Whether to go forward with deletion.
2578	* @param WP_Post $post Post object.
2579	* @param bool $force_delete Whether to bypass the trash.
2580	*/
2581	$check = apply_filters( 'pre_delete_post', null, $post, $force_delete );
2582	if ( null !== $check ) {
2583	return $check;
2584	}
2585
2586	/**
2587	* Fires before a post is deleted, at the start of wp_delete_post().
2588	*
2589	* @since 3.2.0
2590	*
2591	* @see wp_delete_post()
2592	*
2593	* @param int $postid Post ID.
2594	*/
2595	do_action( 'before_delete_post', $postid );
2596
2597	delete_post_meta($postid,'_wp_trash_meta_status');
2598	delete_post_meta($postid,'_wp_trash_meta_time');
2599
2600	wp_delete_object_term_relationships($postid, get_object_taxonomies($post->post_type));
2601
2602	$parent_data = array( 'post_parent' => $post->post_parent );
2603	$parent_where = array( 'post_parent' => $postid );
2604
2605	if ( is_post_type_hierarchical( $post->post_type ) ) {
2606	// Point children of this page to its parent, also clean the cache of affected children.
2607	$children_query = $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE post_parent = %d AND post_type = %s", $postid, $post->post_type );
2608	$children = $wpdb->get_results( $children_query );
2609	if ( $children ) {
2610	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => $post->post_type ) );
2611	}
2612	}
2613
2614	// Do raw query. wp_get_post_revisions() is filtered.
2615	$revision_ids = $wpdb->get_col( $wpdb->prepare( "SELECT ID FROM $wpdb->posts WHERE post_parent = %d AND post_type = 'revision'", $postid ) );
2616	// Use wp_delete_post (via wp_delete_post_revision) again. Ensures any meta/misplaced data gets cleaned up.
2617	foreach ( $revision_ids as $revision_id )
2618	wp_delete_post_revision( $revision_id );
2619
2620	// Point all attachments to this post up one level.
2621	$wpdb->update( $wpdb->posts, $parent_data, $parent_where + array( 'post_type' => 'attachment' ) );
2622
2623	wp_defer_comment_counting( true );
2624
2625	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $postid ));
2626	foreach ( $comment_ids as $comment_id ) {
2627	wp_delete_comment( $comment_id, true );
2628	}
2629
2630	wp_defer_comment_counting( false );
2631
2632	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $postid ));
2633	foreach ( $post_meta_ids as $mid )
2634	delete_metadata_by_mid( 'post', $mid );
2635
2636	/**
2637	* Fires immediately before a post is deleted from the database.
2638	*
2639	* @since 1.2.0
2640	*
2641	* @param int $postid Post ID.
2642	*/
2643	do_action( 'delete_post', $postid );
2644	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $postid ) );
2645	if ( ! $result ) {
2646	return false;
2647	}
2648
2649	/**
2650	* Fires immediately after a post is deleted from the database.
2651	*
2652	* @since 2.2.0
2653	*
2654	* @param int $postid Post ID.
2655	*/
2656	do_action( 'deleted_post', $postid );
2657
2658	clean_post_cache( $post );
2659
2660	if ( is_post_type_hierarchical( $post->post_type ) && $children ) {
2661	foreach ( $children as $child )
2662	clean_post_cache( $child );
2663	}
2664
2665	wp_clear_scheduled_hook('publish_future_post', array( $postid ) );
2666
2667	/**
2668	* Fires after a post is deleted, at the conclusion of wp_delete_post().
2669	*
2670	* @since 3.2.0
2671	*
2672	* @see wp_delete_post()
2673	*
2674	* @param int $postid Post ID.
2675	*/
2676	do_action( 'after_delete_post', $postid );
2677
2678	return $post;
2679	}
2680
2681	/**
2682	* Reset the page_on_front, show_on_front, and page_for_post settings when
2683	* a linked page is deleted or trashed.
2684	*
2685	* Also ensures the post is no longer sticky.
2686	*
2687	* @since 3.7.0
2688	* @access private
2689	*
2690	* @param int $post_id Post ID.
2691	*/
2692	function _reset_front_page_settings_for_post( $post_id ) {
2693	$post = get_post( $post_id );
2694	if ( 'page' == $post->post_type ) {
2695	/*
2696	* If the page is defined in option page_on_front or post_for_posts,
2697	* adjust the corresponding options.
2698	*/
2699	if ( get_option( 'page_on_front' ) == $post->ID ) {
2700	update_option( 'show_on_front', 'posts' );
2701	update_option( 'page_on_front', 0 );
2702	}
2703	if ( get_option( 'page_for_posts' ) == $post->ID ) {
2704	delete_option( 'page_for_posts', 0 );
2705	}
2706	}
2707	unstick_post( $post->ID );
2708	}
2709
2710	/**
2711	* Move a post or page to the Trash
2712	*
2713	* If trash is disabled, the post or page is permanently deleted.
2714	*
2715	* @since 2.9.0
2716	*
2717	* @see wp_delete_post()
2718	*
2719	* @param int $post_id Optional. Post ID. Default is ID of the global $post
2720	* if EMPTY_TRASH_DAYS equals true.
2721	* @return WP_Post\|false\|null Post data on success, false or null on failure.
2722	*/
2723	function wp_trash_post( $post_id = 0 ) {
2724	if ( ! EMPTY_TRASH_DAYS ) {
2725	return wp_delete_post( $post_id, true );
2726	}
2727
2728	$post = get_post( $post_id );
2729
2730	if ( ! $post ) {
2731	return $post;
2732	}
2733
2734	if ( 'trash' === $post->post_status ) {
2735	return false;
2736	}
2737
2738	/**
2739	* Filters whether a post trashing should take place.
2740	*
2741	* @since 4.9.0
2742	*
2743	* @param bool $trash Whether to go forward with trashing.
2744	* @param WP_Post $post Post object.
2745	*/
2746	$check = apply_filters( 'pre_trash_post', null, $post );
2747	if ( null !== $check ) {
2748	return $check;
2749	}
2750
2751	/**
2752	* Fires before a post is sent to the trash.
2753	*
2754	* @since 3.3.0
2755	*
2756	* @param int $post_id Post ID.
2757	*/
2758	do_action( 'wp_trash_post', $post_id );
2759
2760	add_post_meta( $post_id, '_wp_trash_meta_status', $post->post_status );
2761	add_post_meta( $post_id, '_wp_trash_meta_time', time() );
2762
2763	wp_update_post( array( 'ID' => $post_id, 'post_status' => 'trash' ) );
2764
2765	wp_trash_post_comments( $post_id );
2766
2767	/**
2768	* Fires after a post is sent to the trash.
2769	*
2770	* @since 2.9.0
2771	*
2772	* @param int $post_id Post ID.
2773	*/
2774	do_action( 'trashed_post', $post_id );
2775
2776	return $post;
2777	}
2778
2779	/**
2780	* Restore a post or page from the Trash.
2781	*
2782	* @since 2.9.0
2783	*
2784	* @param int $post_id Optional. Post ID. Default is ID of the global $post.
2785	* @return WP_Post\|false\|null Post data on success, false or null on failure.
2786	*/
2787	function wp_untrash_post( $post_id = 0 ) {
2788	$post = get_post( $post_id );
2789
2790	if ( ! $post ) {
2791	return $post;
2792	}
2793
2794	if ( 'trash' !== $post->post_status ) {
2795	return false;
2796	}
2797
2798	/**
2799	* Filters whether a post untrashing should take place.
2800	*
2801	* @since 4.9.0
2802	*
2803	* @param bool $untrash Whether to go forward with untrashing.
2804	* @param WP_Post $post Post object.
2805	*/
2806	$check = apply_filters( 'pre_untrash_post', null, $post );
2807	if ( null !== $check ) {
2808	return $check;
2809	}
2810
2811	/**
2812	* Fires before a post is restored from the trash.
2813	*
2814	* @since 2.9.0
2815	*
2816	* @param int $post_id Post ID.
2817	*/
2818	do_action( 'untrash_post', $post_id );
2819
2820	$post_status = get_post_meta( $post_id, '_wp_trash_meta_status', true );
2821
2822	delete_post_meta( $post_id, '_wp_trash_meta_status' );
2823	delete_post_meta( $post_id, '_wp_trash_meta_time' );
2824
2825	wp_update_post( array( 'ID' => $post_id, 'post_status' => $post_status ) );
2826
2827	wp_untrash_post_comments( $post_id );
2828
2829	/**
2830	* Fires after a post is restored from the trash.
2831	*
2832	* @since 2.9.0
2833	*
2834	* @param int $post_id Post ID.
2835	*/
2836	do_action( 'untrashed_post', $post_id );
2837
2838	return $post;
2839	}
2840
2841	/**
2842	* Moves comments for a post to the trash.
2843	*
2844	* @since 2.9.0
2845	*
2846	* @global wpdb $wpdb WordPress database abstraction object.
2847	*
2848	* @param int\|WP_Post\|null $post Optional. Post ID or post object. Defaults to global $post.
2849	* @return mixed\|void False on failure.
2850	*/
2851	function wp_trash_post_comments( $post = null ) {
2852	global $wpdb;
2853
2854	$post = get_post($post);
2855	if ( empty($post) )
2856	return;
2857
2858	$post_id = $post->ID;
2859
2860	/**
2861	* Fires before comments are sent to the trash.
2862	*
2863	* @since 2.9.0
2864	*
2865	* @param int $post_id Post ID.
2866	*/
2867	do_action( 'trash_post_comments', $post_id );
2868
2869	$comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
2870	if ( empty($comments) )
2871	return;
2872
2873	// Cache current status for each comment.
2874	$statuses = array();
2875	foreach ( $comments as $comment )
2876	$statuses[$comment->comment_ID] = $comment->comment_approved;
2877	add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);
2878
2879	// Set status for all comments to post-trashed.
2880	$result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));
2881
2882	clean_comment_cache( array_keys($statuses) );
2883
2884	/**
2885	* Fires after comments are sent to the trash.
2886	*
2887	* @since 2.9.0
2888	*
2889	* @param int $post_id Post ID.
2890	* @param array $statuses Array of comment statuses.
2891	*/
2892	do_action( 'trashed_post_comments', $post_id, $statuses );
2893
2894	return $result;
2895	}
2896
2897	/**
2898	* Restore comments for a post from the trash.
2899	*
2900	* @since 2.9.0
2901	*
2902	* @global wpdb $wpdb WordPress database abstraction object.
2903	*
2904	* @param int\|WP_Post\|null $post Optional. Post ID or post object. Defaults to global $post.
2905	* @return true\|void
2906	*/
2907	function wp_untrash_post_comments( $post = null ) {
2908	global $wpdb;
2909
2910	$post = get_post($post);
2911	if ( empty($post) )
2912	return;
2913
2914	$post_id = $post->ID;
2915
2916	$statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);
2917
2918	if ( empty($statuses) )
2919	return true;
2920
2921	/**
2922	* Fires before comments are restored for a post from the trash.
2923	*
2924	* @since 2.9.0
2925	*
2926	* @param int $post_id Post ID.
2927	*/
2928	do_action( 'untrash_post_comments', $post_id );
2929
2930	// Restore each comment to its original status.
2931	$group_by_status = array();
2932	foreach ( $statuses as $comment_id => $comment_status )
2933	$group_by_status[$comment_status][] = $comment_id;
2934
2935	foreach ( $group_by_status as $status => $comments ) {
2936	// Sanity check. This shouldn't happen.
2937	if ( 'post-trashed' == $status ) {
2938	$status = '0';
2939	}
2940	$comments_in = implode( ', ', array_map( 'intval', $comments ) );
2941	$wpdb->query( $wpdb->prepare( "UPDATE $wpdb->comments SET comment_approved = %s WHERE comment_ID IN ($comments_in)", $status ) );
2942	}
2943
2944	clean_comment_cache( array_keys($statuses) );
2945
2946	delete_post_meta($post_id, '_wp_trash_meta_comments_status');
2947
2948	/**
2949	* Fires after comments are restored for a post from the trash.
2950	*
2951	* @since 2.9.0
2952	*
2953	* @param int $post_id Post ID.
2954	*/
2955	do_action( 'untrashed_post_comments', $post_id );
2956	}
2957
2958	/**
2959	* Retrieve the list of categories for a post.
2960	*
2961	* Compatibility layer for themes and plugins. Also an easy layer of abstraction
2962	* away from the complexity of the taxonomy layer.
2963	*
2964	* @since 2.1.0
2965	*
2966	* @see wp_get_object_terms()
2967	*
2968	* @param int $post_id Optional. The Post ID. Does not default to the ID of the
2969	* global $post. Default 0.
2970	* @param array $args Optional. Category query parameters. Default empty array.
2971	* See WP_Term_Query::__construct() for supported arguments.
2972	* @return array\|WP_Error List of categories. If the `$fields` argument passed via `$args` is 'all' or
2973	* 'all_with_object_id', an array of WP_Term objects will be returned. If `$fields`
2974	* is 'ids', an array of category ids. If `$fields` is 'names', an array of category names.
2975	* WP_Error object if 'category' taxonomy doesn't exist.
2976	*/
2977	function wp_get_post_categories( $post_id = 0, $args = array() ) {
2978	$post_id = (int) $post_id;
2979
2980	$defaults = array('fields' => 'ids');
2981	$args = wp_parse_args( $args, $defaults );
2982
2983	$cats = wp_get_object_terms($post_id, 'category', $args);
2984	return $cats;
2985	}
2986
2987	/**
2988	* Retrieve the tags for a post.
2989	*
2990	* There is only one default for this function, called 'fields' and by default
2991	* is set to 'all'. There are other defaults that can be overridden in
2992	* wp_get_object_terms().
2993	*
2994	* @since 2.3.0
2995	*
2996	* @param int $post_id Optional. The Post ID. Does not default to the ID of the
2997	* global $post. Default 0.
2998	* @param array $args Optional. Tag query parameters. Default empty array.
2999	* See WP_Term_Query::__construct() for supported arguments.
3000	* @return array\|WP_Error Array of WP_Term objects on success or empty array if no tags were found.
3001	* WP_Error object if 'post_tag' taxonomy doesn't exist.
3002	*/
3003	function wp_get_post_tags( $post_id = 0, $args = array() ) {
3004	return wp_get_post_terms( $post_id, 'post_tag', $args);
3005	}
3006
3007	/**
3008	* Retrieves the terms for a post.
3009	*
3010	* @since 2.8.0
3011	*
3012	* @param int $post_id Optional. The Post ID. Does not default to the ID of the
3013	* global $post. Default 0.
3014	* @param string\|array $taxonomy Optional. The taxonomy slug or array of slugs for which
3015	* to retrieve terms. Default 'post_tag'.
3016	* @param array $args {
3017	* Optional. Term query parameters. See WP_Term_Query::__construct() for supported arguments.
3018	*
3019	* @type string $fields Term fields to retrieve. Default 'all'.
3020	* }
3021	* @return array\|WP_Error Array of WP_Term objects on success or empty array if no terms were found.
3022	* WP_Error object if `$taxonomy` doesn't exist.
3023	*/
3024	function wp_get_post_terms( $post_id = 0, $taxonomy = 'post_tag', $args = array() ) {
3025	$post_id = (int) $post_id;
3026
3027	$defaults = array('fields' => 'all');
3028	$args = wp_parse_args( $args, $defaults );
3029
3030	$tags = wp_get_object_terms($post_id, $taxonomy, $args);
3031
3032	return $tags;
3033	}
3034
3035	/**
3036	* Retrieve a number of recent posts.
3037	*
3038	* @since 1.0.0
3039	*
3040	* @see get_posts()
3041	*
3042	* @param array $args Optional. Arguments to retrieve posts. Default empty array.
3043	* @param string $output Optional. The required return type. One of OBJECT or ARRAY_A, which correspond to
3044	* a WP_Post object or an associative array, respectively. Default ARRAY_A.
3045	* @return array\|false Array of recent posts, where the type of each element is determined by $output parameter.
3046	* Empty array on failure.
3047	*/
3048	function wp_get_recent_posts( $args = array(), $output = ARRAY_A ) {
3049
3050	if ( is_numeric( $args ) ) {
3051	_deprecated_argument( __FUNCTION__, '3.1.0', __( 'Passing an integer number of posts is deprecated. Pass an array of arguments instead.' ) );
3052	$args = array( 'numberposts' => absint( $args ) );
3053	}
3054
3055	// Set default arguments.
3056	$defaults = array(
3057	'numberposts' => 10, 'offset' => 0,
3058	'category' => 0, 'orderby' => 'post_date',
3059	'order' => 'DESC', 'include' => '',
3060	'exclude' => '', 'meta_key' => '',
3061	'meta_value' =>'', 'post_type' => 'post', 'post_status' => 'draft, publish, future, pending, private',
3062	'suppress_filters' => true
3063	);
3064
3065	$r = wp_parse_args( $args, $defaults );
3066
3067	$results = get_posts( $r );
3068
3069	// Backward compatibility. Prior to 3.1 expected posts to be returned in array.
3070	if ( ARRAY_A == $output ){
3071	foreach ( $results as $key => $result ) {
3072	$results[$key] = get_object_vars( $result );
3073	}
3074	return $results ? $results : array();
3075	}
3076
3077	return $results ? $results : false;
3078
3079	}
3080
3081	/**
3082	* Insert or update a post.
3083	*
3084	* If the $postarr parameter has 'ID' set to a value, then post will be updated.
3085	*
3086	* You can set the post date manually, by setting the values for 'post_date'
3087	* and 'post_date_gmt' keys. You can close the comments or open the comments by
3088	* setting the value for 'comment_status' key.
3089	*
3090	* @since 1.0.0
3091	* @since 4.2.0 Support was added for encoding emoji in the post title, content, and excerpt.
3092	* @since 4.4.0 A 'meta_input' array can now be passed to `$postarr` to add post meta data.
3093	*
3094	* @see sanitize_post()
3095	* @global wpdb $wpdb WordPress database abstraction object.
3096	*
3097	* @param array $postarr {
3098	* An array of elements that make up a post to update or insert.
3099	*
3100	* @type int $ID The post ID. If equal to something other than 0,
3101	* the post with that ID will be updated. Default 0.
3102	* @type int $post_author The ID of the user who added the post. Default is
3103	* the current user ID.
3104	* @type string $post_date The date of the post. Default is the current time.
3105	* @type string $post_date_gmt The date of the post in the GMT timezone. Default is
3106	* the value of `$post_date`.
3107	* @type mixed $post_content The post content. Default empty.
3108	* @type string $post_content_filtered The filtered post content. Default empty.
3109	* @type string $post_title The post title. Default empty.
3110	* @type string $post_excerpt The post excerpt. Default empty.
3111	* @type string $post_status The post status. Default 'draft'.
3112	* @type string $post_type The post type. Default 'post'.
3113	* @type string $comment_status Whether the post can accept comments. Accepts 'open' or 'closed'.
3114	* Default is the value of 'default_comment_status' option.
3115	* @type string $ping_status Whether the post can accept pings. Accepts 'open' or 'closed'.
3116	* Default is the value of 'default_ping_status' option.
3117	* @type string $post_password The password to access the post. Default empty.
3118	* @type string $post_name The post name. Default is the sanitized post title
3119	* when creating a new post.
3120	* @type string $to_ping Space or carriage return-separated list of URLs to ping.
3121	* Default empty.
3122	* @type string $pinged Space or carriage return-separated list of URLs that have
3123	* been pinged. Default empty.
3124	* @type string $post_modified The date when the post was last modified. Default is
3125	* the current time.
3126	* @type string $post_modified_gmt The date when the post was last modified in the GMT
3127	* timezone. Default is the current time.
3128	* @type int $post_parent Set this for the post it belongs to, if any. Default 0.
3129	* @type int $menu_order The order the post should be displayed in. Default 0.
3130	* @type string $post_mime_type The mime type of the post. Default empty.
3131	* @type string $guid Global Unique ID for referencing the post. Default empty.
3132	* @type array $post_category Array of category names, slugs, or IDs.
3133	* Defaults to value of the 'default_category' option.
3134	* @type array $tags_input Array of tag names, slugs, or IDs. Default empty.
3135	* @type array $tax_input Array of taxonomy terms keyed by their taxonomy name. Default empty.
3136	* @type array $meta_input Array of post meta values keyed by their post meta key. Default empty.
3137	* }
3138	* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
3139	* @return int\|WP_Error The post ID on success. The value 0 or WP_Error on failure.
3140	*/
3141	function wp_insert_post( $postarr, $wp_error = false ) {
3142	global $wpdb;
3143
3144	$user_id = get_current_user_id();
3145
3146	$defaults = array(
3147	'post_author' => $user_id,
3148	'post_content' => '',
3149	'post_content_filtered' => '',
3150	'post_title' => '',
3151	'post_excerpt' => '',
3152	'post_status' => 'draft',
3153	'post_type' => 'post',
3154	'comment_status' => '',
3155	'ping_status' => '',
3156	'post_password' => '',
3157	'to_ping' => '',
3158	'pinged' => '',
3159	'post_parent' => 0,
3160	'menu_order' => 0,
3161	'guid' => '',
3162	'import_id' => 0,
3163	'context' => '',
3164	);
3165
3166	$postarr = wp_parse_args($postarr, $defaults);
3167
3168	unset( $postarr[ 'filter' ] );
3169
3170	$postarr = sanitize_post($postarr, 'db');
3171
3172	// Are we updating or creating?
3173	$post_ID = 0;
3174	$update = false;
3175	$guid = $postarr['guid'];
3176
3177	if ( ! empty( $postarr['ID'] ) ) {
3178	$update = true;
3179
3180	// Get the post ID and GUID.
3181	$post_ID = $postarr['ID'];
3182	$post_before = get_post( $post_ID );
3183	if ( is_null( $post_before ) ) {
3184	if ( $wp_error ) {
3185	return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
3186	}
3187	return 0;
3188	}
3189
3190	$guid = get_post_field( 'guid', $post_ID );
3191	$previous_status = get_post_field('post_status', $post_ID );
3192	} else {
3193	$previous_status = 'new';
3194	}
3195
3196	$post_type = empty( $postarr['post_type'] ) ? 'post' : $postarr['post_type'];
3197
3198	$post_title = $postarr['post_title'];
3199	$post_content = $postarr['post_content'];
3200	$post_excerpt = $postarr['post_excerpt'];
3201	if ( isset( $postarr['post_name'] ) ) {
3202	$post_name = $postarr['post_name'];
3203	} elseif ( $update ) {
3204	// For an update, don't modify the post_name if it wasn't supplied as an argument.
3205	$post_name = $post_before->post_name;
3206	}
3207
3208	$maybe_empty = 'attachment' !== $post_type
3209	&& ! $post_content && ! $post_title && ! $post_excerpt
3210	&& post_type_supports( $post_type, 'editor' )
3211	&& post_type_supports( $post_type, 'title' )
3212	&& post_type_supports( $post_type, 'excerpt' );
3213
3214	/**
3215	* Filters whether the post should be considered "empty".
3216	*
3217	* The post is considered "empty" if both:
3218	* 1. The post type supports the title, editor, and excerpt fields
3219	* 2. The title, editor, and excerpt fields are all empty
3220	*
3221	* Returning a truthy value to the filter will effectively short-circuit
3222	* the new post being inserted, returning 0. If $wp_error is true, a WP_Error
3223	* will be returned instead.
3224	*
3225	* @since 3.3.0
3226	*
3227	* @param bool $maybe_empty Whether the post should be considered "empty".
3228	* @param array $postarr Array of post data.
3229	*/
3230	if ( apply_filters( 'wp_insert_post_empty_content', $maybe_empty, $postarr ) ) {
3231	if ( $wp_error ) {
3232	return new WP_Error( 'empty_content', __( 'Content, title, and excerpt are empty.' ) );
3233	} else {
3234	return 0;
3235	}
3236	}
3237
3238	$post_status = empty( $postarr['post_status'] ) ? 'draft' : $postarr['post_status'];
3239	if ( 'attachment' === $post_type && ! in_array( $post_status, array( 'inherit', 'private', 'trash', 'auto-draft' ), true ) ) {
3240	$post_status = 'inherit';
3241	}
3242
3243	if ( ! empty( $postarr['post_category'] ) ) {
3244	// Filter out empty terms.
3245	$post_category = array_filter( $postarr['post_category'] );
3246	}
3247
3248	// Make sure we set a valid category.
3249	if ( empty( $post_category ) \|\| 0 == count( $post_category ) \|\| ! is_array( $post_category ) ) {
3250	// 'post' requires at least one category.
3251	if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
3252	$post_category = array( get_option('default_category') );
3253	} else {
3254	$post_category = array();
3255	}
3256	}
3257
3258	// Don't allow contributors to set the post slug for pending review posts.
3259	if ( 'pending' == $post_status && !current_user_can( 'publish_posts' ) ) {
3260	$post_name = '';
3261	}
3262
3263	/*
3264	* Create a valid post name. Drafts and pending posts are allowed to have
3265	* an empty post name.
3266	*/
3267	if ( empty($post_name) ) {
3268	if ( !in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
3269	$post_name = sanitize_title($post_title);
3270	} else {
3271	$post_name = '';
3272	}
3273	} else {
3274	// On updates, we need to check to see if it's using the old, fixed sanitization context.
3275	$check_name = sanitize_title( $post_name, '', 'old-save' );
3276	if ( $update && strtolower( urlencode( $post_name ) ) == $check_name && get_post_field( 'post_name', $post_ID ) == $check_name ) {
3277	$post_name = $check_name;
3278	} else { // new post, or slug has changed.
3279	$post_name = sanitize_title($post_name);
3280	}
3281	}
3282
3283	/*
3284	* If the post date is empty (due to having been new or a draft) and status
3285	* is not 'draft' or 'pending', set date to now.
3286	*/
3287	if ( empty( $postarr['post_date'] ) \|\| '0000-00-00 00:00:00' == $postarr['post_date'] ) {
3288	if ( empty( $postarr['post_date_gmt'] ) \|\| '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
3289	$post_date = current_time( 'mysql' );
3290	} else {
3291	$post_date = get_date_from_gmt( $postarr['post_date_gmt'] );
3292	}
3293	} else {
3294	$post_date = $postarr['post_date'];
3295	}
3296
3297	// Validate the date.
3298	$mm = substr( $post_date, 5, 2 );
3299	$jj = substr( $post_date, 8, 2 );
3300	$aa = substr( $post_date, 0, 4 );
3301	$valid_date = wp_checkdate( $mm, $jj, $aa, $post_date );
3302	if ( ! $valid_date ) {
3303	if ( $wp_error ) {
3304	return new WP_Error( 'invalid_date', __( 'Invalid date.' ) );
3305	} else {
3306	return 0;
3307	}
3308	}
3309
3310	if ( empty( $postarr['post_date_gmt'] ) \|\| '0000-00-00 00:00:00' == $postarr['post_date_gmt'] ) {
3311	if ( ! in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) ) {
3312	$post_date_gmt = get_gmt_from_date( $post_date );
3313	} else {
3314	$post_date_gmt = '0000-00-00 00:00:00';
3315	}
3316	} else {
3317	$post_date_gmt = $postarr['post_date_gmt'];
3318	}
3319
3320	if ( $update \|\| '0000-00-00 00:00:00' == $post_date ) {
3321	$post_modified = current_time( 'mysql' );
3322	$post_modified_gmt = current_time( 'mysql', 1 );
3323	} else {
3324	$post_modified = $post_date;
3325	$post_modified_gmt = $post_date_gmt;
3326	}
3327
3328	if ( 'attachment' !== $post_type ) {
3329	if ( 'publish' == $post_status ) {
3330	$now = gmdate('Y-m-d H:i:59');
3331	if ( mysql2date('U', $post_date_gmt, false) > mysql2date('U', $now, false) ) {
3332	$post_status = 'future';
3333	}
3334	} elseif ( 'future' == $post_status ) {
3335	$now = gmdate('Y-m-d H:i:59');
3336	if ( mysql2date('U', $post_date_gmt, false) <= mysql2date('U', $now, false) ) {
3337	$post_status = 'publish';
3338	}
3339	}
3340	}
3341
3342	// Comment status.
3343	if ( empty( $postarr['comment_status'] ) ) {
3344	if ( $update ) {
3345	$comment_status = 'closed';
3346	} else {
3347	$comment_status = get_default_comment_status( $post_type );
3348	}
3349	} else {
3350	$comment_status = $postarr['comment_status'];
3351	}
3352
3353	// These variables are needed by compact() later.
3354	$post_content_filtered = $postarr['post_content_filtered'];
3355	$post_author = isset( $postarr['post_author'] ) ? $postarr['post_author'] : $user_id;
3356	$ping_status = empty( $postarr['ping_status'] ) ? get_default_comment_status( $post_type, 'pingback' ) : $postarr['ping_status'];
3357	$to_ping = isset( $postarr['to_ping'] ) ? sanitize_trackback_urls( $postarr['to_ping'] ) : '';
3358	$pinged = isset( $postarr['pinged'] ) ? $postarr['pinged'] : '';
3359	$import_id = isset( $postarr['import_id'] ) ? $postarr['import_id'] : 0;
3360
3361	/*
3362	* The 'wp_insert_post_parent' filter expects all variables to be present.
3363	* Previously, these variables would have already been extracted
3364	*/
3365	if ( isset( $postarr['menu_order'] ) ) {
3366	$menu_order = (int) $postarr['menu_order'];
3367	} else {
3368	$menu_order = 0;
3369	}
3370
3371	$post_password = isset( $postarr['post_password'] ) ? $postarr['post_password'] : '';
3372	if ( 'private' == $post_status ) {
3373	$post_password = '';
3374	}
3375
3376	if ( isset( $postarr['post_parent'] ) ) {
3377	$post_parent = (int) $postarr['post_parent'];
3378	} else {
3379	$post_parent = 0;
3380	}
3381
3382	/**
3383	* Filters the post parent -- used to check for and prevent hierarchy loops.
3384	*
3385	* @since 3.1.0
3386	*
3387	* @param int $post_parent Post parent ID.
3388	* @param int $post_ID Post ID.
3389	* @param array $new_postarr Array of parsed post data.
3390	* @param array $postarr Array of sanitized, but otherwise unmodified post data.
3391	*/
3392	$post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, compact( array_keys( $postarr ) ), $postarr );
3393
3394	/*
3395	* If the post is being untrashed and it has a desired slug stored in post meta,
3396	* reassign it.
3397	*/
3398	if ( 'trash' === $previous_status && 'trash' !== $post_status ) {
3399	$desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true );
3400	if ( $desired_post_slug ) {
3401	delete_post_meta( $post_ID, '_wp_desired_post_slug' );
3402	$post_name = $desired_post_slug;
3403	}
3404	}
3405
3406	// If a trashed post has the desired slug, change it and let this post have it.
3407	if ( 'trash' !== $post_status && $post_name ) {
3408	wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID );
3409	}
3410
3411	// When trashing an existing post, change its slug to allow non-trashed posts to use it.
3412	if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) {
3413	$post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID );
3414	}
3415
3416	$post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent );
3417
3418	// Don't unslash.
3419	$post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : '';
3420
3421	// Expected_slashed (everything!).
3422	$data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' );
3423
3424	$emoji_fields = array( 'post_title', 'post_content', 'post_excerpt' );
3425
3426	foreach ( $emoji_fields as $emoji_field ) {
3427	if ( isset( $data[ $emoji_field ] ) ) {
3428	$charset = $wpdb->get_col_charset( $wpdb->posts, $emoji_field );
3429	if ( 'utf8' === $charset ) {
3430	$data[ $emoji_field ] = wp_encode_emoji( $data[ $emoji_field ] );
3431	}
3432	}
3433	}
3434
3435	if ( 'attachment' === $post_type ) {
3436	/**
3437	* Filters attachment post data before it is updated in or added to the database.
3438	*
3439	* @since 3.9.0
3440	*
3441	* @param array $data An array of sanitized attachment post data.
3442	* @param array $postarr An array of unsanitized attachment post data.
3443	*/
3444	$data = apply_filters( 'wp_insert_attachment_data', $data, $postarr );
3445	} else {
3446	/**
3447	* Filters slashed post data just before it is inserted into the database.
3448	*
3449	* @since 2.7.0
3450	*
3451	* @param array $data An array of slashed post data.
3452	* @param array $postarr An array of sanitized, but otherwise unmodified post data.
3453	*/
3454	$data = apply_filters( 'wp_insert_post_data', $data, $postarr );
3455	}
3456	$data = wp_unslash( $data );
3457	$where = array( 'ID' => $post_ID );
3458
3459	if ( $update ) {
3460	/**
3461	* Fires immediately before an existing post is updated in the database.
3462	*
3463	* @since 2.5.0
3464	*
3465	* @param int $post_ID Post ID.
3466	* @param array $data Array of unslashed post data.
3467	*/
3468	do_action( 'pre_post_update', $post_ID, $data );
3469	if ( false === $wpdb->update( $wpdb->posts, $data, $where ) ) {
3470	if ( $wp_error ) {
3471	return new WP_Error('db_update_error', __('Could not update post in the database'), $wpdb->last_error);
3472	} else {
3473	return 0;
3474	}
3475	}
3476	} else {
3477	// If there is a suggested ID, use it if not already present.
3478	if ( ! empty( $import_id ) ) {
3479	$import_id = (int) $import_id;
3480	if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) {
3481	$data['ID'] = $import_id;
3482	}
3483	}
3484	if ( false === $wpdb->insert( $wpdb->posts, $data ) ) {
3485	if ( $wp_error ) {
3486	return new WP_Error('db_insert_error', __('Could not insert post into the database'), $wpdb->last_error);
3487	} else {
3488	return 0;
3489	}
3490	}
3491	$post_ID = (int) $wpdb->insert_id;
3492
3493	// Use the newly generated $post_ID.
3494	$where = array( 'ID' => $post_ID );
3495	}
3496
3497	if ( empty( $data['post_name'] ) && ! in_array( $data['post_status'], array( 'draft', 'pending', 'auto-draft' ) ) ) {
3498	$data['post_name'] = wp_unique_post_slug( sanitize_title( $data['post_title'], $post_ID ), $post_ID, $data['post_status'], $post_type, $post_parent );
3499	$wpdb->update( $wpdb->posts, array( 'post_name' => $data['post_name'] ), $where );
3500	clean_post_cache( $post_ID );
3501	}
3502
3503	if ( is_object_in_taxonomy( $post_type, 'category' ) ) {
3504	wp_set_post_categories( $post_ID, $post_category );
3505	}
3506
3507	if ( isset( $postarr['tags_input'] ) && is_object_in_taxonomy( $post_type, 'post_tag' ) ) {
3508	wp_set_post_tags( $post_ID, $postarr['tags_input'] );
3509	}
3510
3511	// New-style support for all custom taxonomies.
3512	if ( ! empty( $postarr['tax_input'] ) ) {
3513	foreach ( $postarr['tax_input'] as $taxonomy => $tags ) {
3514	$taxonomy_obj = get_taxonomy($taxonomy);
3515	if ( ! $taxonomy_obj ) {
3516	/* translators: %s: taxonomy name */
3517	_doing_it_wrong( __FUNCTION__, sprintf( __( 'Invalid taxonomy: %s.' ), $taxonomy ), '4.4.0' );
3518	continue;
3519	}
3520
3521	// array = hierarchical, string = non-hierarchical.
3522	if ( is_array( $tags ) ) {
3523	$tags = array_filter($tags);
3524	}
3525	if ( current_user_can( $taxonomy_obj->cap->assign_terms ) ) {
3526	wp_set_post_terms( $post_ID, $tags, $taxonomy );
3527	}
3528	}
3529	}
3530
3531	if ( ! empty( $postarr['meta_input'] ) ) {
3532	foreach ( $postarr['meta_input'] as $field => $value ) {
3533	update_post_meta( $post_ID, $field, $value );
3534	}
3535	}
3536
3537	$current_guid = get_post_field( 'guid', $post_ID );
3538
3539	// Set GUID.
3540	if ( ! $update && '' == $current_guid ) {
3541	$wpdb->update( $wpdb->posts, array( 'guid' => get_permalink( $post_ID ) ), $where );
3542	}
3543
3544	if ( 'attachment' === $postarr['post_type'] ) {
3545	if ( ! empty( $postarr['file'] ) ) {
3546	update_attached_file( $post_ID, $postarr['file'] );
3547	}
3548
3549	if ( ! empty( $postarr['context'] ) ) {
3550	add_post_meta( $post_ID, '_wp_attachment_context', $postarr['context'], true );
3551	}
3552	}
3553
3554	// Set or remove featured image.
3555	if ( isset( $postarr['_thumbnail_id'] ) ) {
3556	$thumbnail_support = current_theme_supports( 'post-thumbnails', $post_type ) && post_type_supports( $post_type, 'thumbnail' ) \|\| 'revision' === $post_type;
3557	if ( ! $thumbnail_support && 'attachment' === $post_type && $post_mime_type ) {
3558	if ( wp_attachment_is( 'audio', $post_ID ) ) {
3559	$thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) \|\| current_theme_supports( 'post-thumbnails', 'attachment:audio' );
3560	} elseif ( wp_attachment_is( 'video', $post_ID ) ) {
3561	$thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) \|\| current_theme_supports( 'post-thumbnails', 'attachment:video' );
3562	}
3563	}
3564
3565	if ( $thumbnail_support ) {
3566	$thumbnail_id = intval( $postarr['_thumbnail_id'] );
3567	if ( -1 === $thumbnail_id ) {
3568	delete_post_thumbnail( $post_ID );
3569	} else {
3570	set_post_thumbnail( $post_ID, $thumbnail_id );
3571	}
3572	}
3573	}
3574
3575	clean_post_cache( $post_ID );
3576
3577	$post = get_post( $post_ID );
3578
3579	if ( ! empty( $postarr['page_template'] ) ) {
3580	$post->page_template = $postarr['page_template'];
3581	$page_templates = wp_get_theme()->get_page_templates( $post );
3582	if ( 'default' != $postarr['page_template'] && ! isset( $page_templates[ $postarr['page_template'] ] ) ) {
3583	if ( $wp_error ) {
3584	return new WP_Error( 'invalid_page_template', __( 'Invalid page template.' ) );
3585	}
3586	update_post_meta( $post_ID, '_wp_page_template', 'default' );
3587	} else {
3588	update_post_meta( $post_ID, '_wp_page_template', $postarr['page_template'] );
3589	}
3590	}
3591
3592	if ( 'attachment' !== $postarr['post_type'] ) {
3593	wp_transition_post_status( $data['post_status'], $previous_status, $post );
3594	} else {
3595	if ( $update ) {
3596	/**
3597	* Fires once an existing attachment has been updated.
3598	*
3599	* @since 2.0.0
3600	*
3601	* @param int $post_ID Attachment ID.
3602	*/
3603	do_action( 'edit_attachment', $post_ID );
3604	$post_after = get_post( $post_ID );
3605
3606	/**
3607	* Fires once an existing attachment has been updated.
3608	*
3609	* @since 4.4.0
3610	*
3611	* @param int $post_ID Post ID.
3612	* @param WP_Post $post_after Post object following the update.
3613	* @param WP_Post $post_before Post object before the update.
3614	*/
3615	do_action( 'attachment_updated', $post_ID, $post_after, $post_before );
3616	} else {
3617
3618	/**
3619	* Fires once an attachment has been added.
3620	*
3621	* @since 2.0.0
3622	*
3623	* @param int $post_ID Attachment ID.
3624	*/
3625	do_action( 'add_attachment', $post_ID );
3626	}
3627
3628	return $post_ID;
3629	}
3630
3631	if ( $update ) {
3632	/**
3633	* Fires once an existing post has been updated.
3634	*
3635	* @since 1.2.0
3636	*
3637	* @param int $post_ID Post ID.
3638	* @param WP_Post $post Post object.
3639	*/
3640	do_action( 'edit_post', $post_ID, $post );
3641	$post_after = get_post($post_ID);
3642
3643	/**
3644	* Fires once an existing post has been updated.
3645	*
3646	* @since 3.0.0
3647	*
3648	* @param int $post_ID Post ID.
3649	* @param WP_Post $post_after Post object following the update.
3650	* @param WP_Post $post_before Post object before the update.
3651	*/
3652	do_action( 'post_updated', $post_ID, $post_after, $post_before);
3653	}
3654
3655	/**
3656	* Fires once a post has been saved.
3657	*
3658	* The dynamic portion of the hook name, `$post->post_type`, refers to
3659	* the post type slug.
3660	*
3661	* @since 3.7.0
3662	*
3663	* @param int $post_ID Post ID.
3664	* @param WP_Post $post Post object.
3665	* @param bool $update Whether this is an existing post being updated or not.
3666	*/
3667	do_action( "save_post_{$post->post_type}", $post_ID, $post, $update );
3668
3669	/**
3670	* Fires once a post has been saved.
3671	*
3672	* @since 1.5.0
3673	*
3674	* @param int $post_ID Post ID.
3675	* @param WP_Post $post Post object.
3676	* @param bool $update Whether this is an existing post being updated or not.
3677	*/
3678	do_action( 'save_post', $post_ID, $post, $update );
3679
3680	/**
3681	* Fires once a post has been saved.
3682	*
3683	* @since 2.0.0
3684	*
3685	* @param int $post_ID Post ID.
3686	* @param WP_Post $post Post object.
3687	* @param bool $update Whether this is an existing post being updated or not.
3688	*/
3689	do_action( 'wp_insert_post', $post_ID, $post, $update );
3690
3691	return $post_ID;
3692	}
3693
3694	/**
3695	* Update a post with new post data.
3696	*
3697	* The date does not have to be set for drafts. You can set the date and it will
3698	* not be overridden.
3699	*
3700	* @since 1.0.0
3701	*
3702	* @param array\|object $postarr Optional. Post data. Arrays are expected to be escaped,
3703	* objects are not. Default array.
3704	* @param bool $wp_error Optional. Allow return of WP_Error on failure. Default false.
3705	* @return int\|WP_Error The value 0 or WP_Error on failure. The post ID on success.
3706	*/
3707	function wp_update_post( $postarr = array(), $wp_error = false ) {
3708	if ( is_object($postarr) ) {
3709	// Non-escaped post was passed.
3710	$postarr = get_object_vars($postarr);
3711	$postarr = wp_slash($postarr);
3712	}
3713
3714	// First, get all of the original fields.
3715	$post = get_post($postarr['ID'], ARRAY_A);
3716
3717	if ( is_null( $post ) ) {
3718	if ( $wp_error )
3719	return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );
3720	return 0;
3721	}
3722
3723	// Escape data pulled from DB.
3724	$post = wp_slash($post);
3725
3726	// Passed post category list overwrites existing category list if not empty.
3727	if ( isset($postarr['post_category']) && is_array($postarr['post_category'])
3728	&& 0 != count($postarr['post_category']) )
3729	$post_cats = $postarr['post_category'];
3730	else
3731	$post_cats = $post['post_category'];
3732
3733	// Drafts shouldn't be assigned a date unless explicitly done so by the user.
3734	if ( isset( $post['post_status'] ) && in_array($post['post_status'], array('draft', 'pending', 'auto-draft')) && empty($postarr['edit_date']) &&
3735	('0000-00-00 00:00:00' == $post['post_date_gmt']) )
3736	$clear_date = true;
3737	else
3738	$clear_date = false;
3739
3740	// Merge old and new fields with new fields overwriting old ones.
3741	$postarr = array_merge($post, $postarr);
3742	$postarr['post_category'] = $post_cats;
3743	if ( $clear_date ) {
3744	$postarr['post_date'] = current_time('mysql');
3745	$postarr['post_date_gmt'] = '';
3746	}
3747
3748	if ($postarr['post_type'] == 'attachment')
3749	return wp_insert_attachment($postarr);
3750
3751	return wp_insert_post( $postarr, $wp_error );
3752	}
3753
3754	/**
3755	* Publish a post by transitioning the post status.
3756	*
3757	* @since 2.1.0
3758	*
3759	* @global wpdb $wpdb WordPress database abstraction object.
3760	*
3761	* @param int\|WP_Post $post Post ID or post object.
3762	*/
3763	function wp_publish_post( $post ) {
3764	global $wpdb;
3765
3766	if ( ! $post = get_post( $post ) )
3767	return;
3768
3769	if ( 'publish' == $post->post_status )
3770	return;
3771
3772	$wpdb->update( $wpdb->posts, array( 'post_status' => 'publish' ), array( 'ID' => $post->ID ) );
3773
3774	clean_post_cache( $post->ID );
3775
3776	$old_status = $post->post_status;
3777	$post->post_status = 'publish';
3778	wp_transition_post_status( 'publish', $old_status, $post );
3779
3780	/** This action is documented in wp-includes/post.php */
3781	do_action( 'edit_post', $post->ID, $post );
3782
3783	/** This action is documented in wp-includes/post.php */
3784	do_action( "save_post_{$post->post_type}", $post->ID, $post, true );
3785
3786	/** This action is documented in wp-includes/post.php */
3787	do_action( 'save_post', $post->ID, $post, true );
3788
3789	/** This action is documented in wp-includes/post.php */
3790	do_action( 'wp_insert_post', $post->ID, $post, true );
3791	}
3792
3793	/**
3794	* Publish future post and make sure post ID has future post status.
3795	*
3796	* Invoked by cron 'publish_future_post' event. This safeguard prevents cron
3797	* from publishing drafts, etc.
3798	*
3799	* @since 2.5.0
3800	*
3801	* @param int\|WP_Post $post_id Post ID or post object.
3802	*/
3803	function check_and_publish_future_post( $post_id ) {
3804	$post = get_post($post_id);
3805
3806	if ( empty($post) )
3807	return;
3808
3809	if ( 'future' != $post->post_status )
3810	return;
3811
3812	$time = strtotime( $post->post_date_gmt . ' GMT' );
3813
3814	// Uh oh, someone jumped the gun!
3815	if ( $time > time() ) {
3816	wp_clear_scheduled_hook( 'publish_future_post', array( $post_id ) ); // clear anything else in the system
3817	wp_schedule_single_event( $time, 'publish_future_post', array( $post_id ) );
3818	return;
3819	}
3820
3821	// wp_publish_post() returns no meaningful value.
3822	wp_publish_post( $post_id );
3823	}
3824
3825	/**
3826	* Computes a unique slug for the post, when given the desired slug and some post details.
3827	*
3828	* @since 2.8.0
3829	*
3830	* @global wpdb $wpdb WordPress database abstraction object.
3831	* @global WP_Rewrite $wp_rewrite
3832	*
3833	* @param string $slug The desired slug (post_name).
3834	* @param int $post_ID Post ID.
3835	* @param string $post_status No uniqueness checks are made if the post is still draft or pending.
3836	* @param string $post_type Post type.
3837	* @param int $post_parent Post parent ID.
3838	* @return string Unique slug for the post, based on $post_name (with a -1, -2, etc. suffix)
3839	*/
3840	function wp_unique_post_slug( $slug, $post_ID, $post_status, $post_type, $post_parent ) {
3841	if ( in_array( $post_status, array( 'draft', 'pending', 'auto-draft' ) ) \|\| ( 'inherit' == $post_status && 'revision' == $post_type ) \|\| 'user_request' === $post_type )
3842	return $slug;
3843
3844	global $wpdb, $wp_rewrite;
3845
3846	$original_slug = $slug;
3847
3848	$feeds = $wp_rewrite->feeds;
3849	if ( ! is_array( $feeds ) )
3850	$feeds = array();
3851
3852	if ( 'attachment' == $post_type ) {
3853	// Attachment slugs must be unique across all types.
3854	$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1";
3855	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) );
3856
3857	/**
3858	* Filters whether the post slug would make a bad attachment slug.
3859	*
3860	* @since 3.1.0
3861	*
3862	* @param bool $bad_slug Whether the slug would be bad as an attachment slug.
3863	* @param string $slug The post slug.
3864	*/
3865	if ( $post_name_check \|\| in_array( $slug, $feeds ) \|\| 'embed' === $slug \|\| apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) {
3866	$suffix = 2;
3867	do {
3868	$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
3869	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) );
3870	$suffix++;
3871	} while ( $post_name_check );
3872	$slug = $alt_post_name;
3873	}
3874	} elseif ( is_post_type_hierarchical( $post_type ) ) {
3875	if ( 'nav_menu_item' == $post_type )
3876	return $slug;
3877
3878	/*
3879	* Page slugs must be unique within their own trees. Pages are in a separate
3880	* namespace than posts so page slugs are allowed to overlap post slugs.
3881	*/
3882	$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type IN ( %s, 'attachment' ) AND ID != %d AND post_parent = %d LIMIT 1";
3883	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID, $post_parent ) );
3884
3885	/**
3886	* Filters whether the post slug would make a bad hierarchical post slug.
3887	*
3888	* @since 3.1.0
3889	*
3890	* @param bool $bad_slug Whether the post slug would be bad in a hierarchical post context.
3891	* @param string $slug The post slug.
3892	* @param string $post_type Post type.
3893	* @param int $post_parent Post parent ID.
3894	*/
3895	if ( $post_name_check \|\| in_array( $slug, $feeds ) \|\| 'embed' === $slug \|\| preg_match( "@^($wp_rewrite->pagination_base)?\d+$@", $slug ) \|\| apply_filters( 'wp_unique_post_slug_is_bad_hierarchical_slug', false, $slug, $post_type, $post_parent ) ) {
3896	$suffix = 2;
3897	do {
3898	$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
3899	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID, $post_parent ) );
3900	$suffix++;
3901	} while ( $post_name_check );
3902	$slug = $alt_post_name;
3903	}
3904	} else {
3905	// Post slugs must be unique across all posts.
3906	$check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND post_type = %s AND ID != %d LIMIT 1";
3907	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_type, $post_ID ) );
3908
3909	// Prevent new post slugs that could result in URLs that conflict with date archives.
3910	$post = get_post( $post_ID );
3911	$conflicts_with_date_archive = false;
3912	if ( 'post' === $post_type && ( ! $post \|\| $post->post_name !== $slug ) && preg_match( '/^[0-9]+$/', $slug ) && $slug_num = intval( $slug ) ) {
3913	$permastructs = array_values( array_filter( explode( '/', get_option( 'permalink_structure' ) ) ) );
3914	$postname_index = array_search( '%postname%', $permastructs );
3915
3916	/*
3917	* Potential date clashes are as follows:
3918	*
3919	* - Any integer in the first permastruct position could be a year.
3920	* - An integer between 1 and 12 that follows 'year' conflicts with 'monthnum'.
3921	* - An integer between 1 and 31 that follows 'monthnum' conflicts with 'day'.
3922	*/
3923	if ( 0 === $postname_index \|\|
3924	( $postname_index && '%year%' === $permastructs[ $postname_index - 1 ] && 13 > $slug_num ) \|\|
3925	( $postname_index && '%monthnum%' === $permastructs[ $postname_index - 1 ] && 32 > $slug_num )
3926	) {
3927	$conflicts_with_date_archive = true;
3928	}
3929	}
3930
3931	/**
3932	* Filters whether the post slug would be bad as a flat slug.
3933	*
3934	* @since 3.1.0
3935	*
3936	* @param bool $bad_slug Whether the post slug would be bad as a flat slug.
3937	* @param string $slug The post slug.
3938	* @param string $post_type Post type.
3939	*/
3940	if ( $post_name_check \|\| in_array( $slug, $feeds ) \|\| 'embed' === $slug \|\| $conflicts_with_date_archive \|\| apply_filters( 'wp_unique_post_slug_is_bad_flat_slug', false, $slug, $post_type ) ) {
3941	$suffix = 2;
3942	do {
3943	$alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix";
3944	$post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_type, $post_ID ) );
3945	$suffix++;
3946	} while ( $post_name_check );
3947	$slug = $alt_post_name;
3948	}
3949	}
3950
3951	/**
3952	* Filters the unique post slug.
3953	*
3954	* @since 3.3.0
3955	*
3956	* @param string $slug The post slug.
3957	* @param int $post_ID Post ID.
3958	* @param string $post_status The post status.
3959	* @param string $post_type Post type.
3960	* @param int $post_parent Post parent ID
3961	* @param string $original_slug The original post slug.
3962	*/
3963	return apply_filters( 'wp_unique_post_slug', $slug, $post_ID, $post_status, $post_type, $post_parent, $original_slug );
3964	}
3965
3966	/**
3967	* Truncate a post slug.
3968	*
3969	* @since 3.6.0
3970	* @access private
3971	*
3972	* @see utf8_uri_encode()
3973	*
3974	* @param string $slug The slug to truncate.
3975	* @param int $length Optional. Max length of the slug. Default 200 (characters).
3976	* @return string The truncated slug.
3977	*/
3978	function _truncate_post_slug( $slug, $length = 200 ) {
3979	if ( strlen( $slug ) > $length ) {
3980	$decoded_slug = urldecode( $slug );
3981	if ( $decoded_slug === $slug )
3982	$slug = substr( $slug, 0, $length );
3983	else
3984	$slug = utf8_uri_encode( $decoded_slug, $length );
3985	}
3986
3987	return rtrim( $slug, '-' );
3988	}
3989
3990	/**
3991	* Add tags to a post.
3992	*
3993	* @see wp_set_post_tags()
3994	*
3995	* @since 2.3.0
3996	*
3997	* @param int $post_id Optional. The Post ID. Does not default to the ID of the global $post.
3998	* @param string\|array $tags Optional. An array of tags to set for the post, or a string of tags
3999	* separated by commas. Default empty.
4000	* @return array\|false\|WP_Error Array of affected term IDs. WP_Error or false on failure.
4001	*/
4002	function wp_add_post_tags( $post_id = 0, $tags = '' ) {
4003	return wp_set_post_tags($post_id, $tags, true);
4004	}
4005
4006	/**
4007	* Set the tags for a post.
4008	*
4009	* @since 2.3.0
4010	*
4011	* @see wp_set_object_terms()
4012	*
4013	* @param int $post_id Optional. The Post ID. Does not default to the ID of the global $post.
4014	* @param string\|array $tags Optional. An array of tags to set for the post, or a string of tags
4015	* separated by commas. Default empty.
4016	* @param bool $append Optional. If true, don't delete existing tags, just add on. If false,
4017	* replace the tags with the new tags. Default false.
4018	* @return array\|false\|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
4019	*/
4020	function wp_set_post_tags( $post_id = 0, $tags = '', $append = false ) {
4021	return wp_set_post_terms( $post_id, $tags, 'post_tag', $append);
4022	}
4023
4024	/**
4025	* Set the terms for a post.
4026	*
4027	* @since 2.8.0
4028	*
4029	* @see wp_set_object_terms()
4030	*
4031	* @param int $post_id Optional. The Post ID. Does not default to the ID of the global $post.
4032	* @param string\|array $tags Optional. An array of terms to set for the post, or a string of terms
4033	* separated by commas. Default empty.
4034	* @param string $taxonomy Optional. Taxonomy name. Default 'post_tag'.
4035	* @param bool $append Optional. If true, don't delete existing terms, just add on. If false,
4036	* replace the terms with the new terms. Default false.
4037	* @return array\|false\|WP_Error Array of term taxonomy IDs of affected terms. WP_Error or false on failure.
4038	*/
4039	function wp_set_post_terms( $post_id = 0, $tags = '', $taxonomy = 'post_tag', $append = false ) {
4040	$post_id = (int) $post_id;
4041
4042	if ( !$post_id )
4043	return false;
4044
4045	if ( empty($tags) )
4046	$tags = array();
4047
4048	if ( ! is_array( $tags ) ) {
4049	$comma = _x( ',', 'tag delimiter' );
4050	if ( ',' !== $comma )
4051	$tags = str_replace( $comma, ',', $tags );
4052	$tags = explode( ',', trim( $tags, " \n\t\r\0\x0B," ) );
4053	}
4054
4055	/*
4056	* Hierarchical taxonomies must always pass IDs rather than names so that
4057	* children with the same names but different parents aren't confused.
4058	*/
4059	if ( is_taxonomy_hierarchical( $taxonomy ) ) {
4060	$tags = array_unique( array_map( 'intval', $tags ) );
4061	}
4062
4063	return wp_set_object_terms( $post_id, $tags, $taxonomy, $append );
4064	}
4065
4066	/**
4067	* Set categories for a post.
4068	*
4069	* If the post categories parameter is not set, then the default category is
4070	* going used.
4071	*
4072	* @since 2.1.0
4073	*
4074	* @param int $post_ID Optional. The Post ID. Does not default to the ID
4075	* of the global $post. Default 0.
4076	* @param array\|int $post_categories Optional. List of categories or ID of category.
4077	* Default empty array.
4078	* @param bool $append If true, don't delete existing categories, just add on.
4079	* If false, replace the categories with the new categories.
4080	* @return array\|false\|WP_Error Array of term taxonomy IDs of affected categories. WP_Error or false on failure.
4081	*/
4082	function wp_set_post_categories( $post_ID = 0, $post_categories = array(), $append = false ) {
4083	$post_ID = (int) $post_ID;
4084	$post_type = get_post_type( $post_ID );
4085	$post_status = get_post_status( $post_ID );
4086	// If $post_categories isn't already an array, make it one:
4087	$post_categories = (array) $post_categories;
4088	if ( empty( $post_categories ) ) {
4089	if ( 'post' == $post_type && 'auto-draft' != $post_status ) {
4090	$post_categories = array( get_option('default_category') );
4091	$append = false;
4092	} else {
4093	$post_categories = array();
4094	}
4095	} elseif ( 1 == count( $post_categories ) && '' == reset( $post_categories ) ) {
4096	return true;
4097	}
4098
4099	return wp_set_post_terms( $post_ID, $post_categories, 'category', $append );
4100	}
4101
4102	/**
4103	* Fires actions related to the transitioning of a post's status.
4104	*
4105	* When a post is saved, the post status is "transitioned" from one status to another,
4106	* though this does not always mean the status has actually changed before and after
4107	* the save. This function fires a number of action hooks related to that transition:
4108	* the generic {@see 'transition_post_status'} action, as well as the dynamic hooks
4109	* {@see '$old_status_to_$new_status'} and {@see '$new_status_$post->post_type'}. Note
4110	* that the function does not transition the post object in the database.
4111	*
4112	* For instance: When publishing a post for the first time, the post status may transition
4113	* from 'draft' – or some other status – to 'publish'. However, if a post is already
4114	* published and is simply being updated, the "old" and "new" statuses may both be 'publish'
4115	* before and after the transition.
4116	*
4117	* @since 2.3.0
4118	*
4119	* @param string $new_status Transition to this post status.
4120	* @param string $old_status Previous post status.
4121	* @param WP_Post $post Post data.
4122	*/
4123	function wp_transition_post_status( $new_status, $old_status, $post ) {
4124	/**
4125	* Fires when a post is transitioned from one status to another.
4126	*
4127	* @since 2.3.0
4128	*
4129	* @param string $new_status New post status.
4130	* @param string $old_status Old post status.
4131	* @param WP_Post $post Post object.
4132	*/
4133	do_action( 'transition_post_status', $new_status, $old_status, $post );
4134
4135	/**
4136	* Fires when a post is transitioned from one status to another.
4137	*
4138	* The dynamic portions of the hook name, `$new_status` and `$old status`,
4139	* refer to the old and new post statuses, respectively.
4140	*
4141	* @since 2.3.0
4142	*
4143	* @param WP_Post $post Post object.
4144	*/
4145	do_action( "{$old_status}_to_{$new_status}", $post );
4146
4147	/**
4148	* Fires when a post is transitioned from one status to another.
4149	*
4150	* The dynamic portions of the hook name, `$new_status` and `$post->post_type`,
4151	* refer to the new post status and post type, respectively.
4152	*
4153	* Please note: When this action is hooked using a particular post status (like
4154	* 'publish', as `publish_{$post->post_type}`), it will fire both when a post is
4155	* first transitioned to that status from something else, as well as upon
4156	* subsequent post updates (old and new status are both the same).
4157	*
4158	* Therefore, if you are looking to only fire a callback when a post is first
4159	* transitioned to a status, use the {@see 'transition_post_status'} hook instead.
4160	*
4161	* @since 2.3.0
4162	*
4163	* @param int $post_id Post ID.
4164	* @param WP_Post $post Post object.
4165	*/
4166	do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
4167	}
4168
4169	//
4170	// Comment, trackback, and pingback functions.
4171	//
4172
4173	/**
4174	* Add a URL to those already pinged.
4175	*
4176	* @since 1.5.0
4177	* @since 4.7.0 $post_id can be a WP_Post object.
4178	* @since 4.7.0 $uri can be an array of URIs.
4179	*
4180	* @global wpdb $wpdb WordPress database abstraction object.
4181	*
4182	* @param int\|WP_Post $post_id Post object or ID.
4183	* @param string\|array $uri Ping URI or array of URIs.
4184	* @return int\|false How many rows were updated.
4185	*/
4186	function add_ping( $post_id, $uri ) {
4187	global $wpdb;
4188
4189	$post = get_post( $post_id );
4190	if ( ! $post ) {
4191	return false;
4192	}
4193
4194	$pung = trim( $post->pinged );
4195	$pung = preg_split( '/\s/', $pung );
4196
4197	if ( is_array( $uri ) ) {
4198	$pung = array_merge( $pung, $uri );
4199	}
4200	else {
4201	$pung[] = $uri;
4202	}
4203	$new = implode("\n", $pung);
4204
4205	/**
4206	* Filters the new ping URL to add for the given post.
4207	*
4208	* @since 2.0.0
4209	*
4210	* @param string $new New ping URL to add.
4211	*/
4212	$new = apply_filters( 'add_ping', $new );
4213
4214	$return = $wpdb->update( $wpdb->posts, array( 'pinged' => $new ), array( 'ID' => $post->ID ) );
4215	clean_post_cache( $post->ID );
4216	return $return;
4217	}
4218
4219	/**
4220	* Retrieve enclosures already enclosed for a post.
4221	*
4222	* @since 1.5.0
4223	*
4224	* @param int $post_id Post ID.
4225	* @return array List of enclosures.
4226	*/
4227	function get_enclosed( $post_id ) {
4228	$custom_fields = get_post_custom( $post_id );
4229	$pung = array();
4230	if ( !is_array( $custom_fields ) )
4231	return $pung;
4232
4233	foreach ( $custom_fields as $key => $val ) {
4234	if ( 'enclosure' != $key \|\| !is_array( $val ) )
4235	continue;
4236	foreach ( $val as $enc ) {
4237	$enclosure = explode( "\n", $enc );
4238	$pung[] = trim( $enclosure[ 0 ] );
4239	}
4240	}
4241
4242	/**
4243	* Filters the list of enclosures already enclosed for the given post.
4244	*
4245	* @since 2.0.0
4246	*
4247	* @param array $pung Array of enclosures for the given post.
4248	* @param int $post_id Post ID.
4249	*/
4250	return apply_filters( 'get_enclosed', $pung, $post_id );
4251	}
4252
4253	/**
4254	* Retrieve URLs already pinged for a post.
4255	*
4256	* @since 1.5.0
4257	*
4258	* @since 4.7.0 $post_id can be a WP_Post object.
4259	*
4260	* @param int\|WP_Post $post_id Post ID or object.
4261	* @return array
4262	*/
4263	function get_pung( $post_id ) {
4264	$post = get_post( $post_id );
4265	if ( ! $post ) {
4266	return false;
4267	}
4268
4269	$pung = trim( $post->pinged );
4270	$pung = preg_split( '/\s/', $pung );
4271
4272	/**
4273	* Filters the list of already-pinged URLs for the given post.
4274	*
4275	* @since 2.0.0
4276	*
4277	* @param array $pung Array of URLs already pinged for the given post.
4278	*/
4279	return apply_filters( 'get_pung', $pung );
4280	}
4281
4282	/**
4283	* Retrieve URLs that need to be pinged.
4284	*
4285	* @since 1.5.0
4286	* @since 4.7.0 $post_id can be a WP_Post object.
4287	*
4288	* @param int\|WP_Post $post_id Post Object or ID
4289	* @return array
4290	*/
4291	function get_to_ping( $post_id ) {
4292	$post = get_post( $post_id );
4293
4294	if ( ! $post ) {
4295	return false;
4296	}
4297
4298	$to_ping = sanitize_trackback_urls( $post->to_ping );
4299	$to_ping = preg_split('/\s/', $to_ping, -1, PREG_SPLIT_NO_EMPTY);
4300
4301	/**
4302	* Filters the list of URLs yet to ping for the given post.
4303	*
4304	* @since 2.0.0
4305	*
4306	* @param array $to_ping List of URLs yet to ping.
4307	*/
4308	return apply_filters( 'get_to_ping', $to_ping );
4309	}
4310
4311	/**
4312	* Do trackbacks for a list of URLs.
4313	*
4314	* @since 1.0.0
4315	*
4316	* @param string $tb_list Comma separated list of URLs.
4317	* @param int $post_id Post ID.
4318	*/
4319	function trackback_url_list( $tb_list, $post_id ) {
4320	if ( ! empty( $tb_list ) ) {
4321	// Get post data.
4322	$postdata = get_post( $post_id, ARRAY_A );
4323
4324	// Form an excerpt.
4325	$excerpt = strip_tags( $postdata['post_excerpt'] ? $postdata['post_excerpt'] : $postdata['post_content'] );
4326
4327	if ( strlen( $excerpt ) > 255 ) {
4328	$excerpt = substr( $excerpt, 0, 252 ) . '…';
4329	}
4330
4331	$trackback_urls = explode( ',', $tb_list );
4332	foreach ( (array) $trackback_urls as $tb_url ) {
4333	$tb_url = trim( $tb_url );
4334	trackback( $tb_url, wp_unslash( $postdata['post_title'] ), $excerpt, $post_id );
4335	}
4336	}
4337	}
4338
4339	//
4340	// Page functions
4341	//
4342
4343	/**
4344	* Get a list of page IDs.
4345	*
4346	* @since 2.0.0
4347	*
4348	* @global wpdb $wpdb WordPress database abstraction object.
4349	*
4350	* @return array List of page IDs.
4351	*/
4352	function get_all_page_ids() {
4353	global $wpdb;
4354
4355	$page_ids = wp_cache_get('all_page_ids', 'posts');
4356	if ( ! is_array( $page_ids ) ) {
4357	$page_ids = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE post_type = 'page'");
4358	wp_cache_add('all_page_ids', $page_ids, 'posts');
4359	}
4360
4361	return $page_ids;
4362	}
4363
4364	/**
4365	* Retrieves page data given a page ID or page object.
4366	*
4367	* Use get_post() instead of get_page().
4368	*
4369	* @since 1.5.1
4370	* @deprecated 3.5.0 Use get_post()
4371	*
4372	* @param mixed $page Page object or page ID. Passed by reference.
4373	* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
4374	* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
4375	* @param string $filter Optional. How the return value should be filtered. Accepts 'raw',
4376	* 'edit', 'db', 'display'. Default 'raw'.
4377	* @return WP_Post\|array\|null WP_Post (or array) on success, or null on failure.
4378	*/
4379	function get_page( $page, $output = OBJECT, $filter = 'raw') {
4380	return get_post( $page, $output, $filter );
4381	}
4382
4383	/**
4384	* Retrieves a page given its path.
4385	*
4386	* @since 2.1.0
4387	*
4388	* @global wpdb $wpdb WordPress database abstraction object.
4389	*
4390	* @param string $page_path Page path.
4391	* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
4392	* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
4393	* @param string\|array $post_type Optional. Post type or array of post types. Default 'page'.
4394	* @return WP_Post\|array\|null WP_Post (or array) on success, or null on failure.
4395	*/
4396	function get_page_by_path( $page_path, $output = OBJECT, $post_type = 'page' ) {
4397	global $wpdb;
4398
4399	$last_changed = wp_cache_get_last_changed( 'posts' );
4400
4401	$hash = md5( $page_path . serialize( $post_type ) );
4402	$cache_key = "get_page_by_path:$hash:$last_changed";
4403	$cached = wp_cache_get( $cache_key, 'posts' );
4404	if ( false !== $cached ) {
4405	// Special case: '0' is a bad `$page_path`.
4406	if ( '0' === $cached \|\| 0 === $cached ) {
4407	return;
4408	} else {
4409	return get_post( $cached, $output );
4410	}
4411	}
4412
4413	$page_path = rawurlencode(urldecode($page_path));
4414	$page_path = str_replace('%2F', '/', $page_path);
4415	$page_path = str_replace('%20', ' ', $page_path);
4416	$parts = explode( '/', trim( $page_path, '/' ) );
4417	$parts = array_map( 'sanitize_title_for_query', $parts );
4418	$escaped_parts = esc_sql( $parts );
4419
4420	$in_string = "'" . implode( "','", $escaped_parts ) . "'";
4421
4422	if ( is_array( $post_type ) ) {
4423	$post_types = $post_type;
4424	} else {
4425	$post_types = array( $post_type, 'attachment' );
4426	}
4427
4428	$post_types = esc_sql( $post_types );
4429	$post_type_in_string = "'" . implode( "','", $post_types ) . "'";
4430	$sql = "
4431	SELECT ID, post_name, post_parent, post_type
4432	FROM $wpdb->posts
4433	WHERE post_name IN ($in_string)
4434	AND post_type IN ($post_type_in_string)
4435	";
4436
4437	$pages = $wpdb->get_results( $sql, OBJECT_K );
4438
4439	$revparts = array_reverse( $parts );
4440
4441	$foundid = 0;
4442	foreach ( (array) $pages as $page ) {
4443	if ( $page->post_name == $revparts[0] ) {
4444	$count = 0;
4445	$p = $page;
4446
4447	/*
4448	* Loop through the given path parts from right to left,
4449	* ensuring each matches the post ancestry.
4450	*/
4451	while ( $p->post_parent != 0 && isset( $pages[ $p->post_parent ] ) ) {
4452	$count++;
4453	$parent = $pages[ $p->post_parent ];
4454	if ( ! isset( $revparts[ $count ] ) \|\| $parent->post_name != $revparts[ $count ] )
4455	break;
4456	$p = $parent;
4457	}
4458
4459	if ( $p->post_parent == 0 && $count+1 == count( $revparts ) && $p->post_name == $revparts[ $count ] ) {
4460	$foundid = $page->ID;
4461	if ( $page->post_type == $post_type )
4462	break;
4463	}
4464	}
4465	}
4466
4467	// We cache misses as well as hits.
4468	wp_cache_set( $cache_key, $foundid, 'posts' );
4469
4470	if ( $foundid ) {
4471	return get_post( $foundid, $output );
4472	}
4473	}
4474
4475	/**
4476	* Retrieve a page given its title.
4477	*
4478	* @since 2.1.0
4479	*
4480	* @global wpdb $wpdb WordPress database abstraction object.
4481	*
4482	* @param string $page_title Page title
4483	* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which correspond to
4484	* a WP_Post object, an associative array, or a numeric array, respectively. Default OBJECT.
4485	* @param string\|array $post_type Optional. Post type or array of post types. Default 'page'.
4486	* @return WP_Post\|array\|null WP_Post (or array) on success, or null on failure.
4487	*/
4488	function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
4489	global $wpdb;
4490
4491	if ( is_array( $post_type ) ) {
4492	$post_type = esc_sql( $post_type );
4493	$post_type_in_string = "'" . implode( "','", $post_type ) . "'";
4494	$sql = $wpdb->prepare( "
4495	SELECT ID
4496	FROM $wpdb->posts
4497	WHERE post_title = %s
4498	AND post_type IN ($post_type_in_string)
4499	", $page_title );
4500	} else {
4501	$sql = $wpdb->prepare( "
4502	SELECT ID
4503	FROM $wpdb->posts
4504	WHERE post_title = %s
4505	AND post_type = %s
4506	", $page_title, $post_type );
4507	}
4508
4509	$page = $wpdb->get_var( $sql );
4510
4511	if ( $page ) {
4512	return get_post( $page, $output );
4513	}
4514	}
4515
4516	/**
4517	* Identify descendants of a given page ID in a list of page objects.
4518	*
4519	* Descendants are identified from the `$pages` array passed to the function. No database queries are performed.
4520	*
4521	* @since 1.5.1
4522	*
4523	* @param int $page_id Page ID.
4524	* @param array $pages List of page objects from which descendants should be identified.
4525	* @return array List of page children.
4526	*/
4527	function get_page_children( $page_id, $pages ) {
4528	// Build a hash of ID -> children.
4529	$children = array();
4530	foreach ( (array) $pages as $page ) {
4531	$children[ intval( $page->post_parent ) ][] = $page;
4532	}
4533
4534	$page_list = array();
4535
4536	// Start the search by looking at immediate children.
4537	if ( isset( $children[ $page_id ] ) ) {
4538	// Always start at the end of the stack in order to preserve original `$pages` order.
4539	$to_look = array_reverse( $children[ $page_id ] );
4540
4541	while ( $to_look ) {
4542	$p = array_pop( $to_look );
4543	$page_list[] = $p;
4544	if ( isset( $children[ $p->ID ] ) ) {
4545	foreach ( array_reverse( $children[ $p->ID ] ) as $child ) {
4546	// Append to the `$to_look` stack to descend the tree.
4547	$to_look[] = $child;
4548	}
4549	}
4550	}
4551	}
4552
4553	return $page_list;
4554	}
4555
4556	/**
4557	* Order the pages with children under parents in a flat list.
4558	*
4559	* It uses auxiliary structure to hold parent-children relationships and
4560	* runs in O(N) complexity
4561	*
4562	* @since 2.0.0
4563	*
4564	* @param array $pages Posts array (passed by reference).
4565	* @param int $page_id Optional. Parent page ID. Default 0.
4566	* @return array A list arranged by hierarchy. Children immediately follow their parents.
4567	*/
4568	function get_page_hierarchy( &$pages, $page_id = 0 ) {
4569	if ( empty( $pages ) ) {
4570	return array();
4571	}
4572
4573	$children = array();
4574	foreach ( (array) $pages as $p ) {
4575	$parent_id = intval( $p->post_parent );
4576	$children[ $parent_id ][] = $p;
4577	}
4578
4579	$result = array();
4580	_page_traverse_name( $page_id, $children, $result );
4581
4582	return $result;
4583	}
4584
4585	/**
4586	* Traverse and return all the nested children post names of a root page.
4587	*
4588	* $children contains parent-children relations
4589	*
4590	* @since 2.9.0
4591	*
4592	* @see _page_traverse_name()
4593	*
4594	* @param int $page_id Page ID.
4595	* @param array $children Parent-children relations (passed by reference).
4596	* @param array $result Result (passed by reference).
4597	*/
4598	function _page_traverse_name( $page_id, &$children, &$result ){
4599	if ( isset( $children[ $page_id ] ) ){
4600	foreach ( (array)$children[ $page_id ] as $child ) {
4601	$result[ $child->ID ] = $child->post_name;
4602	_page_traverse_name( $child->ID, $children, $result );
4603	}
4604	}
4605	}
4606
4607	/**
4608	* Build the URI path for a page.
4609	*
4610	* Sub pages will be in the "directory" under the parent page post name.
4611	*
4612	* @since 1.5.0
4613	* @since 4.6.0 Converted the `$page` parameter to optional.
4614	*
4615	* @param WP_Post\|object\|int $page Optional. Page ID or WP_Post object. Default is global $post.
4616	* @return string\|false Page URI, false on error.
4617	*/
4618	function get_page_uri( $page = 0 ) {
4619	if ( ! $page instanceof WP_Post ) {
4620	$page = get_post( $page );
4621	}
4622
4623	if ( ! $page )
4624	return false;
4625
4626	$uri = $page->post_name;
4627
4628	foreach ( $page->ancestors as $parent ) {
4629	$parent = get_post( $parent );
4630	if ( $parent && $parent->post_name ) {
4631	$uri = $parent->post_name . '/' . $uri;
4632	}
4633	}
4634
4635	/**
4636	* Filters the URI for a page.
4637	*
4638	* @since 4.4.0
4639	*
4640	* @param string $uri Page URI.
4641	* @param WP_Post $page Page object.
4642	*/
4643	return apply_filters( 'get_page_uri', $uri, $page );
4644	}
4645
4646	/**
4647	* Retrieve a list of pages (or hierarchical post type items).
4648	*
4649	* @global wpdb $wpdb WordPress database abstraction object.
4650	*
4651	* @since 1.5.0
4652	*
4653	* @param array\|string $args {
4654	* Optional. Array or string of arguments to retrieve pages.
4655	*
4656	* @type int $child_of Page ID to return child and grandchild pages of. Note: The value
4657	* of `$hierarchical` has no bearing on whether `$child_of` returns
4658	* hierarchical results. Default 0, or no restriction.
4659	* @type string $sort_order How to sort retrieved pages. Accepts 'ASC', 'DESC'. Default 'ASC'.
4660	* @type string $sort_column What columns to sort pages by, comma-separated. Accepts 'post_author',
4661	* 'post_date', 'post_title', 'post_name', 'post_modified', 'menu_order',
4662	* 'post_modified_gmt', 'post_parent', 'ID', 'rand', 'comment_count'.
4663	* 'post_' can be omitted for any values that start with it.
4664	* Default 'post_title'.
4665	* @type bool $hierarchical Whether to return pages hierarchically. If false in conjunction with
4666	* `$child_of` also being false, both arguments will be disregarded.
4667	* Default true.
4668	* @type array $exclude Array of page IDs to exclude. Default empty array.
4669	* @type array $include Array of page IDs to include. Cannot be used with `$child_of`,
4670	* `$parent`, `$exclude`, `$meta_key`, `$meta_value`, or `$hierarchical`.
4671	* Default empty array.
4672	* @type string $meta_key Only include pages with this meta key. Default empty.
4673	* @type string $meta_value Only include pages with this meta value. Requires `$meta_key`.
4674	* Default empty.
4675	* @type string $authors A comma-separated list of author IDs. Default empty.
4676	* @type int $parent Page ID to return direct children of. Default -1, or no restriction.
4677	* @type string\|array $exclude_tree Comma-separated string or array of page IDs to exclude.
4678	* Default empty array.
4679	* @type int $number The number of pages to return. Default 0, or all pages.
4680	* @type int $offset The number of pages to skip before returning. Requires `$number`.
4681	* Default 0.
4682	* @type string $post_type The post type to query. Default 'page'.
4683	* @type string\|array $post_status A comma-separated list or array of post statuses to include.
4684	* Default 'publish'.
4685	* }
4686	* @return array\|false List of pages matching defaults or `$args`.
4687	*/
4688	function get_pages( $args = array() ) {
4689	global $wpdb;
4690
4691	$defaults = array(
4692	'child_of' => 0,
4693	'sort_order' => 'ASC',
4694	'sort_column' => 'post_title',
4695	'hierarchical' => 1,
4696	'exclude' => array(),
4697	'include' => array(),
4698	'meta_key' => '',
4699	'meta_value' => '',
4700	'authors' => '',
4701	'parent' => -1,
4702	'exclude_tree' => array(),
4703	'number' => '',
4704	'offset' => 0,
4705	'post_type' => 'page',
4706	'post_status' => 'publish',
4707	);
4708
4709	$r = wp_parse_args( $args, $defaults );
4710
4711	$number = (int) $r['number'];
4712	$offset = (int) $r['offset'];
4713	$child_of = (int) $r['child_of'];
4714	$hierarchical = $r['hierarchical'];
4715	$exclude = $r['exclude'];
4716	$meta_key = $r['meta_key'];
4717	$meta_value = $r['meta_value'];
4718	$parent = $r['parent'];
4719	$post_status = $r['post_status'];
4720
4721	// Make sure the post type is hierarchical.
4722	$hierarchical_post_types = get_post_types( array( 'hierarchical' => true ) );
4723	if ( ! in_array( $r['post_type'], $hierarchical_post_types ) ) {
4724	return false;
4725	}
4726
4727	if ( $parent > 0 && ! $child_of ) {
4728	$hierarchical = false;
4729	}
4730
4731	// Make sure we have a valid post status.
4732	if ( ! is_array( $post_status ) ) {
4733	$post_status = explode( ',', $post_status );
4734	}
4735	if ( array_diff( $post_status, get_post_stati() ) ) {
4736	return false;
4737	}
4738
4739	// $args can be whatever, only use the args defined in defaults to compute the key.
4740	$key = md5( serialize( wp_array_slice_assoc( $r, array_keys( $defaults ) ) ) );
4741	$last_changed = wp_cache_get_last_changed( 'posts' );
4742
4743	$cache_key = "get_pages:$key:$last_changed";
4744	if ( $cache = wp_cache_get( $cache_key, 'posts' ) ) {
4745	// Convert to WP_Post instances.
4746	$pages = array_map( 'get_post', $cache );
4747	/** This filter is documented in wp-includes/post.php */
4748	$pages = apply_filters( 'get_pages', $pages, $r );
4749	return $pages;
4750	}
4751
4752	$inclusions = '';
4753	if ( ! empty( $r['include'] ) ) {
4754	$child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include
4755	$parent = -1;
4756	$exclude = '';
4757	$meta_key = '';
4758	$meta_value = '';
4759	$hierarchical = false;
4760	$incpages = wp_parse_id_list( $r['include'] );
4761	if ( ! empty( $incpages ) ) {
4762	$inclusions = ' AND ID IN (' . implode( ',', $incpages ) . ')';
4763	}
4764	}
4765
4766	$exclusions = '';
4767	if ( ! empty( $exclude ) ) {
4768	$expages = wp_parse_id_list( $exclude );
4769	if ( ! empty( $expages ) ) {
4770	$exclusions = ' AND ID NOT IN (' . implode( ',', $expages ) . ')';
4771	}
4772	}
4773
4774	$author_query = '';
4775	if ( ! empty( $r['authors'] ) ) {
4776	$post_authors = preg_split( '/[\s,]+/', $r['authors'] );
4777
4778	if ( ! empty( $post_authors ) ) {
4779	foreach ( $post_authors as $post_author ) {
4780	//Do we have an author id or an author login?
4781	if ( 0 == intval($post_author) ) {
4782	$post_author = get_user_by('login', $post_author);
4783	if ( empty( $post_author ) ) {
4784	continue;
4785	}
4786	if ( empty( $post_author->ID ) ) {
4787	continue;
4788	}
4789	$post_author = $post_author->ID;
4790	}
4791
4792	if ( '' == $author_query ) {
4793	$author_query = $wpdb->prepare(' post_author = %d ', $post_author);
4794	} else {
4795	$author_query .= $wpdb->prepare(' OR post_author = %d ', $post_author);
4796	}
4797	}
4798	if ( '' != $author_query ) {
4799	$author_query = " AND ($author_query)";
4800	}
4801	}
4802	}
4803
4804	$join = '';
4805	$where = "$exclusions $inclusions ";
4806	if ( '' !== $meta_key \|\| '' !== $meta_value ) {
4807	$join = " LEFT JOIN $wpdb->postmeta ON ( $wpdb->posts.ID = $wpdb->postmeta.post_id )";
4808
4809	// meta_key and meta_value might be slashed
4810	$meta_key = wp_unslash($meta_key);
4811	$meta_value = wp_unslash($meta_value);
4812	if ( '' !== $meta_key ) {
4813	$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_key = %s", $meta_key);
4814	}
4815	if ( '' !== $meta_value ) {
4816	$where .= $wpdb->prepare(" AND $wpdb->postmeta.meta_value = %s", $meta_value);
4817	}
4818
4819	}
4820
4821	if ( is_array( $parent ) ) {
4822	$post_parent__in = implode( ',', array_map( 'absint', (array) $parent ) );
4823	if ( ! empty( $post_parent__in ) ) {
4824	$where .= " AND post_parent IN ($post_parent__in)";
4825	}
4826	} elseif ( $parent >= 0 ) {
4827	$where .= $wpdb->prepare(' AND post_parent = %d ', $parent);
4828	}
4829
4830	if ( 1 == count( $post_status ) ) {
4831	$where_post_type = $wpdb->prepare( "post_type = %s AND post_status = %s", $r['post_type'], reset( $post_status ) );
4832	} else {
4833	$post_status = implode( "', '", $post_status );
4834	$where_post_type = $wpdb->prepare( "post_type = %s AND post_status IN ('$post_status')", $r['post_type'] );
4835	}
4836
4837	$orderby_array = array();
4838	$allowed_keys = array( 'author', 'post_author', 'date', 'post_date', 'title', 'post_title', 'name', 'post_name', 'modified',
4839	'post_modified', 'modified_gmt', 'post_modified_gmt', 'menu_order', 'parent', 'post_parent',
4840	'ID', 'rand', 'comment_count' );
4841
4842	foreach ( explode( ',', $r['sort_column'] ) as $orderby ) {
4843	$orderby = trim( $orderby );
4844	if ( ! in_array( $orderby, $allowed_keys ) ) {
4845	continue;
4846	}
4847
4848	switch ( $orderby ) {
4849	case 'menu_order':
4850	break;
4851	case 'ID':
4852	$orderby = "$wpdb->posts.ID";
4853	break;
4854	case 'rand':
4855	$orderby = 'RAND()';
4856	break;
4857	case 'comment_count':
4858	$orderby = "$wpdb->posts.comment_count";
4859	break;
4860	default:
4861	if ( 0 === strpos( $orderby, 'post_' ) ) {
4862	$orderby = "$wpdb->posts." . $orderby;
4863	} else {
4864	$orderby = "$wpdb->posts.post_" . $orderby;
4865	}
4866	}
4867
4868	$orderby_array[] = $orderby;
4869
4870	}
4871	$sort_column = ! empty( $orderby_array ) ? implode( ',', $orderby_array ) : "$wpdb->posts.post_title";
4872
4873	$sort_order = strtoupper( $r['sort_order'] );
4874	if ( '' !== $sort_order && ! in_array( $sort_order, array( 'ASC', 'DESC' ) ) ) {
4875	$sort_order = 'ASC';
4876	}
4877
4878	$query = "SELECT * FROM $wpdb->posts $join WHERE ($where_post_type) $where ";
4879	$query .= $author_query;
4880	$query .= " ORDER BY " . $sort_column . " " . $sort_order ;
4881
4882	if ( ! empty( $number ) ) {
4883	$query .= ' LIMIT ' . $offset . ',' . $number;
4884	}
4885
4886	$pages = $wpdb->get_results($query);
4887
4888	if ( empty($pages) ) {
4889	/** This filter is documented in wp-includes/post.php */
4890	$pages = apply_filters( 'get_pages', array(), $r );
4891	return $pages;
4892	}
4893
4894	// Sanitize before caching so it'll only get done once.
4895	$num_pages = count($pages);
4896	for ($i = 0; $i < $num_pages; $i++) {
4897	$pages[$i] = sanitize_post($pages[$i], 'raw');
4898	}
4899
4900	// Update cache.
4901	update_post_cache( $pages );
4902
4903	if ( $child_of \|\| $hierarchical ) {
4904	$pages = get_page_children($child_of, $pages);
4905	}
4906
4907	if ( ! empty( $r['exclude_tree'] ) ) {
4908	$exclude = wp_parse_id_list( $r['exclude_tree'] );
4909	foreach ( $exclude as $id ) {
4910	$children = get_page_children( $id, $pages );
4911	foreach ( $children as $child ) {
4912	$exclude[] = $child->ID;
4913	}
4914	}
4915
4916	$num_pages = count( $pages );
4917	for ( $i = 0; $i < $num_pages; $i++ ) {
4918	if ( in_array( $pages[$i]->ID, $exclude ) ) {
4919	unset( $pages[$i] );
4920	}
4921	}
4922	}
4923
4924	$page_structure = array();
4925	foreach ( $pages as $page ) {
4926	$page_structure[] = $page->ID;
4927	}
4928
4929	wp_cache_set( $cache_key, $page_structure, 'posts' );
4930
4931	// Convert to WP_Post instances
4932	$pages = array_map( 'get_post', $pages );
4933
4934	/**
4935	* Filters the retrieved list of pages.
4936	*
4937	* @since 2.1.0
4938	*
4939	* @param array $pages List of pages to retrieve.
4940	* @param array $r Array of get_pages() arguments.
4941	*/
4942	return apply_filters( 'get_pages', $pages, $r );
4943	}
4944
4945	//
4946	// Attachment functions
4947	//
4948
4949	/**
4950	* Check if the attachment URI is local one and is really an attachment.
4951	*
4952	* @since 2.0.0
4953	*
4954	* @param string $url URL to check
4955	* @return bool True on success, false on failure.
4956	*/
4957	function is_local_attachment($url) {
4958	if (strpos($url, home_url()) === false)
4959	return false;
4960	if (strpos($url, home_url('/?attachment_id=')) !== false)
4961	return true;
4962	if ( $id = url_to_postid($url) ) {
4963	$post = get_post($id);
4964	if ( 'attachment' == $post->post_type )
4965	return true;
4966	}
4967	return false;
4968	}
4969
4970	/**
4971	* Insert an attachment.
4972	*
4973	* If you set the 'ID' in the $args parameter, it will mean that you are
4974	* updating and attempt to update the attachment. You can also set the
4975	* attachment name or title by setting the key 'post_name' or 'post_title'.
4976	*
4977	* You can set the dates for the attachment manually by setting the 'post_date'
4978	* and 'post_date_gmt' keys' values.
4979	*
4980	* By default, the comments will use the default settings for whether the
4981	* comments are allowed. You can close them manually or keep them open by
4982	* setting the value for the 'comment_status' key.
4983	*
4984	* @since 2.0.0
4985	* @since 4.7.0 Added the `$wp_error` parameter to allow a WP_Error to be returned on failure.
4986	*
4987	* @see wp_insert_post()
4988	*
4989	* @param string\|array $args Arguments for inserting an attachment.
4990	* @param string $file Optional. Filename.
4991	* @param int $parent Optional. Parent post ID.
4992	* @param bool $wp_error Optional. Whether to return a WP_Error on failure. Default false.
4993	* @return int\|WP_Error The attachment ID on success. The value 0 or WP_Error on failure.
4994	*/
4995	function wp_insert_attachment( $args, $file = false, $parent = 0, $wp_error = false ) {
4996	$defaults = array(
4997	'file' => $file,
4998	'post_parent' => 0
4999	);
5000
5001	$data = wp_parse_args( $args, $defaults );
5002
5003	if ( ! empty( $parent ) ) {
5004	$data['post_parent'] = $parent;
5005	}
5006
5007	$data['post_type'] = 'attachment';
5008
5009	return wp_insert_post( $data, $wp_error );
5010	}
5011
5012	/**
5013	* Trash or delete an attachment.
5014	*
5015	* When an attachment is permanently deleted, the file will also be removed.
5016	* Deletion removes all post meta fields, taxonomy, comments, etc. associated
5017	* with the attachment (except the main post).
5018	*
5019	* The attachment is moved to the trash instead of permanently deleted unless trash
5020	* for media is disabled, item is already in the trash, or $force_delete is true.
5021	*
5022	* @since 2.0.0
5023	*
5024	* @global wpdb $wpdb WordPress database abstraction object.
5025	*
5026	* @param int $post_id Attachment ID.
5027	* @param bool $force_delete Optional. Whether to bypass trash and force deletion.
5028	* Default false.
5029	* @return WP_Post\|false\|null Post data on success, false or null on failure.
5030	*/
5031	function wp_delete_attachment( $post_id, $force_delete = false ) {
5032	global $wpdb;
5033
5034	$post = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->posts WHERE ID = %d", $post_id ) );
5035
5036	if ( ! $post ) {
5037	return $post;
5038	}
5039
5040	$post = get_post( $post );
5041
5042	if ( 'attachment' !== $post->post_type ) {
5043	return false;
5044	}
5045
5046	if ( ! $force_delete && EMPTY_TRASH_DAYS && MEDIA_TRASH && 'trash' !== $post->post_status ) {
5047	return wp_trash_post( $post_id );
5048	}
5049
5050	delete_post_meta($post_id, '_wp_trash_meta_status');
5051	delete_post_meta($post_id, '_wp_trash_meta_time');
5052
5053	$meta = wp_get_attachment_metadata( $post_id );
5054	$backup_sizes = get_post_meta( $post->ID, '_wp_attachment_backup_sizes', true );
5055	$file = get_attached_file( $post_id );
5056
5057	if ( is_multisite() )
5058	delete_transient( 'dirsize_cache' );
5059
5060	/**
5061	* Fires before an attachment is deleted, at the start of wp_delete_attachment().
5062	*
5063	* @since 2.0.0
5064	*
5065	* @param int $post_id Attachment ID.
5066	*/
5067	do_action( 'delete_attachment', $post_id );
5068
5069	wp_delete_object_term_relationships($post_id, array('category', 'post_tag'));
5070	wp_delete_object_term_relationships($post_id, get_object_taxonomies($post->post_type));
5071
5072	// Delete all for any posts.
5073	delete_metadata( 'post', null, '_thumbnail_id', $post_id, true );
5074
5075	wp_defer_comment_counting( true );
5076
5077	$comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id ));
5078	foreach ( $comment_ids as $comment_id ) {
5079	wp_delete_comment( $comment_id, true );
5080	}
5081
5082	wp_defer_comment_counting( false );
5083
5084	$post_meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE post_id = %d ", $post_id ));
5085	foreach ( $post_meta_ids as $mid )
5086	delete_metadata_by_mid( 'post', $mid );
5087
5088	/** This action is documented in wp-includes/post.php */
5089	do_action( 'delete_post', $post_id );
5090	$result = $wpdb->delete( $wpdb->posts, array( 'ID' => $post_id ) );
5091	if ( ! $result ) {
5092	return false;
5093	}
5094	/** This action is documented in wp-includes/post.php */
5095	do_action( 'deleted_post', $post_id );
5096
5097	wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file );
5098
5099	clean_post_cache( $post );
5100
5101	return $post;
5102	}
5103
5104	/**
5105	* Deletes all files that belong to the given attachment.
5106	*
5107	* @since 4.9.7
5108	*
5109	* @param int $post_id Attachment ID.
5110	* @param array $meta The attachment's meta data.
5111	* @param array $backup_sizes The meta data for the attachment's backup images.
5112	* @param string $file Absolute path to the attachment's file.
5113	* @return bool True on success, false on failure.
5114	*/
5115	function wp_delete_attachment_files( $post_id, $meta, $backup_sizes, $file ) {
5116	global $wpdb;
5117
5118	$uploadpath = wp_get_upload_dir();
5119	$deleted = true;
5120
5121	if ( ! empty( $meta['thumb'] ) ) {
5122	// Don't delete the thumb if another attachment uses it.
5123	if ( ! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%' . $wpdb->esc_like( $meta['thumb'] ) . '%', $post_id ) ) ) {
5124	$thumbfile = str_replace( basename( $file ), $meta['thumb'], $file );
5125	if ( ! empty( $thumbfile ) ) {
5126	$thumbfile = path_join( $uploadpath['basedir'], $thumbfile );
5127	$thumbdir = path_join( $uploadpath['basedir'], dirname( $file ) );
5128
5129	if ( ! wp_delete_file_from_directory( $thumbfile, $thumbdir ) ) {
5130	$deleted = false;
5131	}
5132	}
5133	}
5134	}
5135
5136	// Remove intermediate and backup images if there are any.
5137	if ( isset( $meta['sizes'] ) && is_array( $meta['sizes'] ) ) {
5138	$intermediate_dir = path_join( $uploadpath['basedir'], dirname( $file ) );
5139	foreach ( $meta['sizes'] as $size => $sizeinfo ) {
5140	$intermediate_file = str_replace( basename( $file ), $sizeinfo['file'], $file );
5141	if ( ! empty( $intermediate_file ) ) {
5142	$intermediate_file = path_join( $uploadpath['basedir'], $intermediate_file );
5143
5144	if ( ! wp_delete_file_from_directory( $intermediate_file, $intermediate_dir ) ) {
5145	$deleted = false;
5146	}
5147	}
5148	}
5149	}
5150
5151	if ( is_array( $backup_sizes ) ) {
5152	$del_dir = path_join( $uploadpath['basedir'], dirname( $meta['file'] ) );
5153	foreach ( $backup_sizes as $size ) {
5154	$del_file = path_join( dirname( $meta['file'] ), $size['file'] );
5155	if ( ! empty( $del_file ) ) {
5156	$del_file = path_join( $uploadpath['basedir'], $del_file );
5157
5158	if ( ! wp_delete_file_from_directory( $del_file, $del_dir ) ) {
5159	$deleted = false;
5160	}
5161	}
5162	}
5163	}
5164
5165	if ( ! wp_delete_file_from_directory( $file, $uploadpath['basedir'] ) ) {
5166	$deleted = false;
5167	}
5168
5169	return $deleted;
5170	}
5171
5172	/**
5173	* Retrieve attachment meta field for attachment ID.
5174	*
5175	* @since 2.1.0
5176	*
5177	* @param int $attachment_id Attachment post ID. Defaults to global $post.
5178	* @param bool $unfiltered Optional. If true, filters are not run. Default false.
5179	* @return mixed Attachment meta field. False on failure.
5180	*/
5181	function wp_get_attachment_metadata( $attachment_id = 0, $unfiltered = false ) {
5182	$attachment_id = (int) $attachment_id;
5183	if ( ! $post = get_post( $attachment_id ) ) {
5184	return false;
5185	}
5186
5187	$data = get_post_meta( $post->ID, '_wp_attachment_metadata', true );
5188
5189	if ( $unfiltered )
5190	return $data;
5191
5192	/**
5193	* Filters the attachment meta data.
5194	*
5195	* @since 2.1.0
5196	*
5197	* @param array\|bool $data Array of meta data for the given attachment, or false
5198	* if the object does not exist.
5199	* @param int $attachment_id Attachment post ID.
5200	*/
5201	return apply_filters( 'wp_get_attachment_metadata', $data, $post->ID );
5202	}
5203
5204	/**
5205	* Update metadata for an attachment.
5206	*
5207	* @since 2.1.0
5208	*
5209	* @param int $attachment_id Attachment post ID.
5210	* @param array $data Attachment meta data.
5211	* @return int\|bool False if $post is invalid.
5212	*/
5213	function wp_update_attachment_metadata( $attachment_id, $data ) {
5214	$attachment_id = (int) $attachment_id;
5215	if ( ! $post = get_post( $attachment_id ) ) {
5216	return false;
5217	}
5218
5219	/**
5220	* Filters the updated attachment meta data.
5221	*
5222	* @since 2.1.0
5223	*
5224	* @param array $data Array of updated attachment meta data.
5225	* @param int $attachment_id Attachment post ID.
5226	*/
5227	if ( $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ) )
5228	return update_post_meta( $post->ID, '_wp_attachment_metadata', $data );
5229	else
5230	return delete_post_meta( $post->ID, '_wp_attachment_metadata' );
5231	}
5232
5233	/**
5234	* Retrieve the URL for an attachment.
5235	*
5236	* @since 2.1.0
5237	*
5238	* @global string $pagenow
5239	*
5240	* @param int $attachment_id Optional. Attachment post ID. Defaults to global $post.
5241	* @return string\|false Attachment URL, otherwise false.
5242	*/
5243	function wp_get_attachment_url( $attachment_id = 0 ) {
5244	$attachment_id = (int) $attachment_id;
5245	if ( ! $post = get_post( $attachment_id ) ) {
5246	return false;
5247	}
5248
5249	if ( 'attachment' != $post->post_type )
5250	return false;
5251
5252	$url = '';
5253	// Get attached file.
5254	if ( $file = get_post_meta( $post->ID, '_wp_attached_file', true ) ) {
5255	// Get upload directory.
5256	if ( ( $uploads = wp_get_upload_dir() ) && false === $uploads['error'] ) {
5257	// Check that the upload base exists in the file location.
5258	if ( 0 === strpos( $file, $uploads['basedir'] ) ) {
5259	// Replace file location with url location.
5260	$url = str_replace($uploads['basedir'], $uploads['baseurl'], $file);
5261	} elseif ( false !== strpos($file, 'wp-content/uploads') ) {
5262	// Get the directory name relative to the basedir (back compat for pre-2.7 uploads)
5263	$url = trailingslashit( $uploads['baseurl'] . '/' . _wp_get_attachment_relative_path( $file ) ) . basename( $file );
5264	} else {
5265	// It's a newly-uploaded file, therefore $file is relative to the basedir.
5266	$url = $uploads['baseurl'] . "/$file";
5267	}
5268	}
5269	}
5270
5271	/*
5272	* If any of the above options failed, Fallback on the GUID as used pre-2.7,
5273	* not recommended to rely upon this.
5274	*/
5275	if ( empty($url) ) {
5276	$url = get_the_guid( $post->ID );
5277	}
5278
5279	// On SSL front end, URLs should be HTTPS.
5280	if ( is_ssl() && ! is_admin() && 'wp-login.php' !== $GLOBALS['pagenow'] ) {
5281	$url = set_url_scheme( $url );
5282	}
5283
5284	/**
5285	* Filters the attachment URL.
5286	*
5287	* @since 2.1.0
5288	*
5289	* @param string $url URL for the given attachment.
5290	* @param int $attachment_id Attachment post ID.
5291	*/
5292	$url = apply_filters( 'wp_get_attachment_url', $url, $post->ID );
5293
5294	if ( empty( $url ) )
5295	return false;
5296
5297	return $url;
5298	}
5299
5300	/**
5301	* Retrieves the caption for an attachment.
5302	*
5303	* @since 4.6.0
5304	*
5305	* @param int $post_id Optional. Attachment ID. Default is the ID of the global `$post`.
5306	* @return string\|false False on failure. Attachment caption on success.
5307	*/
5308	function wp_get_attachment_caption( $post_id = 0 ) {
5309	$post_id = (int) $post_id;
5310	if ( ! $post = get_post( $post_id ) ) {
5311	return false;
5312	}
5313
5314	if ( 'attachment' !== $post->post_type ) {
5315	return false;
5316	}
5317
5318	$caption = $post->post_excerpt;
5319
5320	/**
5321	* Filters the attachment caption.
5322	*
5323	* @since 4.6.0
5324	*
5325	* @param string $caption Caption for the given attachment.
5326	* @param int $post_id Attachment ID.
5327	*/
5328	return apply_filters( 'wp_get_attachment_caption', $caption, $post->ID );
5329	}
5330
5331	/**
5332	* Retrieve thumbnail for an attachment.
5333	*
5334	* @since 2.1.0
5335	*
5336	* @param int $post_id Optional. Attachment ID. Default 0.
5337	* @return string\|false False on failure. Thumbnail file path on success.
5338	*/
5339	function wp_get_attachment_thumb_file( $post_id = 0 ) {
5340	$post_id = (int) $post_id;
5341	if ( !$post = get_post( $post_id ) )
5342	return false;
5343	if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
5344	return false;
5345
5346	$file = get_attached_file( $post->ID );
5347
5348	if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
5349	/**
5350	* Filters the attachment thumbnail file path.
5351	*
5352	* @since 2.1.0
5353	*
5354	* @param string $thumbfile File path to the attachment thumbnail.
5355	* @param int $post_id Attachment ID.
5356	*/
5357	return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
5358	}
5359	return false;
5360	}
5361
5362	/**
5363	* Retrieve URL for an attachment thumbnail.
5364	*
5365	* @since 2.1.0
5366	*
5367	* @param int $post_id Optional. Attachment ID. Default 0.
5368	* @return string\|false False on failure. Thumbnail URL on success.
5369	*/
5370	function wp_get_attachment_thumb_url( $post_id = 0 ) {
5371	$post_id = (int) $post_id;
5372	if ( !$post = get_post( $post_id ) )
5373	return false;
5374	if ( !$url = wp_get_attachment_url( $post->ID ) )
5375	return false;
5376
5377	$sized = image_downsize( $post_id, 'thumbnail' );
5378	if ( $sized )
5379	return $sized[0];
5380
5381	if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) )
5382	return false;
5383
5384	$url = str_replace(basename($url), basename($thumb), $url);
5385
5386	/**
5387	* Filters the attachment thumbnail URL.
5388	*
5389	* @since 2.1.0
5390	*
5391	* @param string $url URL for the attachment thumbnail.
5392	* @param int $post_id Attachment ID.
5393	*/
5394	return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID );
5395	}
5396
5397	/**
5398	* Verifies an attachment is of a given type.
5399	*
5400	* @since 4.2.0
5401	*
5402	* @param string $type Attachment type. Accepts 'image', 'audio', or 'video'.
5403	* @param int\|WP_Post $post Optional. Attachment ID or object. Default is global $post.
5404	* @return bool True if one of the accepted types, false otherwise.
5405	*/
5406	function wp_attachment_is( $type, $post = null ) {
5407	if ( ! $post = get_post( $post ) ) {
5408	return false;
5409	}
5410
5411	if ( ! $file = get_attached_file( $post->ID ) ) {
5412	return false;
5413	}
5414
5415	if ( 0 === strpos( $post->post_mime_type, $type . '/' ) ) {
5416	return true;
5417	}
5418
5419	$check = wp_check_filetype( $file );
5420	if ( empty( $check['ext'] ) ) {
5421	return false;
5422	}
5423
5424	$ext = $check['ext'];
5425
5426	if ( 'import' !== $post->post_mime_type ) {
5427	return $type === $ext;
5428	}
5429
5430	switch ( $type ) {
5431	case 'image':
5432	$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
5433	return in_array( $ext, $image_exts );
5434
5435	case 'audio':
5436	return in_array( $ext, wp_get_audio_extensions() );
5437
5438	case 'video':
5439	return in_array( $ext, wp_get_video_extensions() );
5440
5441	default:
5442	return $type === $ext;
5443	}
5444	}
5445
5446	/**
5447	* Checks if the attachment is an image.
5448	*
5449	* @since 2.1.0
5450	* @since 4.2.0 Modified into wrapper for wp_attachment_is() and
5451	* allowed WP_Post object to be passed.
5452	*
5453	* @param int\|WP_Post $post Optional. Attachment ID or object. Default is global $post.
5454	* @return bool Whether the attachment is an image.
5455	*/
5456	function wp_attachment_is_image( $post = null ) {
5457	return wp_attachment_is( 'image', $post );
5458	}
5459
5460	/**
5461	* Retrieve the icon for a MIME type.
5462	*
5463	* @since 2.1.0
5464	*
5465	* @param string\|int $mime MIME type or attachment ID.
5466	* @return string\|false Icon, false otherwise.
5467	*/
5468	function wp_mime_type_icon( $mime = 0 ) {
5469	if ( !is_numeric($mime) )
5470	$icon = wp_cache_get("mime_type_icon_$mime");
5471
5472	$post_id = 0;
5473	if ( empty($icon) ) {
5474	$post_mimes = array();
5475	if ( is_numeric($mime) ) {
5476	$mime = (int) $mime;
5477	if ( $post = get_post( $mime ) ) {
5478	$post_id = (int) $post->ID;
5479	$file = get_attached_file( $post_id );
5480	$ext = preg_replace('/^.+?\.([^.]+)$/', '$1', $file);
5481	if ( !empty($ext) ) {
5482	$post_mimes[] = $ext;
5483	if ( $ext_type = wp_ext2type( $ext ) )
5484	$post_mimes[] = $ext_type;
5485	}
5486	$mime = $post->post_mime_type;
5487	} else {
5488	$mime = 0;
5489

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Ticket #44952: post.php