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Ticket #35201: formatting.php

File formatting.php, 158.2 KB (added by njbebop, 10 years ago)
Updated formatting.php file

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1	<?php
2	/**
3	* Main WordPress Formatting API.
4	*
5	* Handles many functions for formatting output.
6	*
7	* @package WordPress
8	*/
9
10	/**
11	* Replaces common plain text characters into formatted entities
12	*
13	* As an example,
14	*
15	* 'cause today's effort makes it worth tomorrow's "holiday" ...
16	*
17	* Becomes:
18	*
19	* ’cause today’s effort makes it worth tomorrow’s “holiday” …
20	*
21	* Code within certain html blocks are skipped.
22	*
23	* Do not use this function before the 'init' action hook; everything will break.
24	*
25	* @since 0.71
26	*
27	* @global array $wp_cockneyreplace Array of formatted entities for certain common phrases
28	* @global array $shortcode_tags
29	* @staticvar array $static_characters
30	* @staticvar array $static_replacements
31	* @staticvar array $dynamic_characters
32	* @staticvar array $dynamic_replacements
33	* @staticvar array $default_no_texturize_tags
34	* @staticvar array $default_no_texturize_shortcodes
35	* @staticvar bool $run_texturize
36	*
37	* @param string $text The text to be formatted
38	* @param bool $reset Set to true for unit testing. Translated patterns will reset.
39	* @return string The string replaced with html entities
40	*/
41	function wptexturize( $text, $reset = false ) {
42	global $wp_cockneyreplace, $shortcode_tags;
43	static $static_characters = null,
44	$static_replacements = null,
45	$dynamic_characters = null,
46	$dynamic_replacements = null,
47	$default_no_texturize_tags = null,
48	$default_no_texturize_shortcodes = null,
49	$run_texturize = true,
50	$apos = null,
51	$prime = null,
52	$double_prime = null,
53	$opening_quote = null,
54	$closing_quote = null,
55	$opening_single_quote = null,
56	$closing_single_quote = null,
57	$open_q_flag = '<!--oq-->',
58	$open_sq_flag = '<!--osq-->',
59	$apos_flag = '<!--apos-->';
60
61	// If there's nothing to do, just stop.
62	if ( empty( $text ) \|\| false === $run_texturize ) {
63	return $text;
64	}
65
66	// Set up static variables. Run once only.
67	if ( $reset \|\| ! isset( $static_characters ) ) {
68	/**
69	* Filter whether to skip running wptexturize().
70	*
71	* Passing false to the filter will effectively short-circuit wptexturize().
72	* returning the original text passed to the function instead.
73	*
74	* The filter runs only once, the first time wptexturize() is called.
75	*
76	* @since 4.0.0
77	*
78	* @see wptexturize()
79	*
80	* @param bool $run_texturize Whether to short-circuit wptexturize().
81	*/
82	$run_texturize = apply_filters( 'run_wptexturize', $run_texturize );
83	if ( false === $run_texturize ) {
84	return $text;
85	}
86
87	/* translators: opening curly double quote */
88	$opening_quote = _x( '“', 'opening curly double quote' );
89	/* translators: closing curly double quote */
90	$closing_quote = _x( '”', 'closing curly double quote' );
91
92	/* translators: apostrophe, for example in 'cause or can't */
93	$apos = _x( '’', 'apostrophe' );
94
95	/* translators: prime, for example in 9' (nine feet) */
96	$prime = _x( '′', 'prime' );
97	/* translators: double prime, for example in 9" (nine inches) */
98	$double_prime = _x( '″', 'double prime' );
99
100	/* translators: opening curly single quote */
101	$opening_single_quote = _x( '‘', 'opening curly single quote' );
102	/* translators: closing curly single quote */
103	$closing_single_quote = _x( '’', 'closing curly single quote' );
104
105	/* translators: en dash */
106	$en_dash = _x( '–', 'en dash' );
107	/* translators: em dash */
108	$em_dash = _x( '—', 'em dash' );
109
110	$default_no_texturize_tags = array('pre', 'code', 'kbd', 'style', 'script', 'tt');
111	$default_no_texturize_shortcodes = array('code');
112
113	// if a plugin has provided an autocorrect array, use it
114	if ( isset($wp_cockneyreplace) ) {
115	$cockney = array_keys( $wp_cockneyreplace );
116	$cockneyreplace = array_values( $wp_cockneyreplace );
117	} else {
118	/* translators: This is a comma-separated list of words that defy the syntax of quotations in normal use,
119	* for example... 'We do not have enough words yet' ... is a typical quoted phrase. But when we write
120	* lines of code 'til we have enough of 'em, then we need to insert apostrophes instead of quotes.
121	*/
122	$cockney = explode( ',', _x( "'tain't,'twere,'twas,'tis,'twill,'til,'bout,'nuff,'round,'cause,'em",
123	'Comma-separated list of words to texturize in your language' ) );
124
125	$cockneyreplace = explode( ',', _x( '’tain’t,’twere,’twas,’tis,’twill,’til,’bout,’nuff,’round,’cause,’em',
126	'Comma-separated list of replacement words in your language' ) );
127	}
128
129	$static_characters = array_merge( array( '...', '``', '\'\'', ' (tm)' ), $cockney );
130	$static_replacements = array_merge( array( '…', $opening_quote, $closing_quote, ' ™' ), $cockneyreplace );
131
132
133	// Pattern-based replacements of characters.
134	// Sort the remaining patterns into several arrays for performance tuning.
135	$dynamic_characters = array( 'apos' => array(), 'quote' => array(), 'dash' => array() );
136	$dynamic_replacements = array( 'apos' => array(), 'quote' => array(), 'dash' => array() );
137	$dynamic = array();
138	$spaces = wp_spaces_regexp();
139
140	// '99' and '99" are ambiguous among other patterns; assume it's an abbreviated year at the end of a quotation.
141	if ( "'" !== $apos \|\| "'" !== $closing_single_quote ) {
142	$dynamic[ '/\'(\d\d)\'(?=\Z\|[.,:;!?)}\-\]]\|>\|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_single_quote;
143	}
144	if ( "'" !== $apos \|\| '"' !== $closing_quote ) {
145	$dynamic[ '/\'(\d\d)"(?=\Z\|[.,:;!?)}\-\]]\|>\|' . $spaces . ')/' ] = $apos_flag . '$1' . $closing_quote;
146	}
147
148	// '99 '99s '99's (apostrophe) But never '9 or '99% or '999 or '99.0.
149	if ( "'" !== $apos ) {
150	$dynamic[ '/\'(?=\d\d(?:\Z\|(?![%\d]\|[.,]\d)))/' ] = $apos_flag;
151	}
152
153	// Quoted Numbers like '0.42'
154	if ( "'" !== $opening_single_quote && "'" !== $closing_single_quote ) {
155	$dynamic[ '/(?<=\A\|' . $spaces . ')\'(\d[.,\d]*)\'/' ] = $open_sq_flag . '$1' . $closing_single_quote;
156	}
157
158	// Single quote at start, or preceded by (, {, <, [, ", -, or spaces.
159	if ( "'" !== $opening_single_quote ) {
160	$dynamic[ '/(?<=\A\|[([{"\-]\|<\|' . $spaces . ')\'/' ] = $open_sq_flag;
161	}
162
163	// Apostrophe in a word. No spaces, double apostrophes, or other punctuation.
164	if ( "'" !== $apos ) {
165	$dynamic[ '/(?<!' . $spaces . ')\'(?!\Z\|[.,:;!?"\'(){}[\]\-]\|&[lg]t;\|' . $spaces . ')/' ] = $apos_flag;
166	}
167
168	$dynamic_characters['apos'] = array_keys( $dynamic );
169	$dynamic_replacements['apos'] = array_values( $dynamic );
170	$dynamic = array();
171
172	// Quoted Numbers like "42"
173	if ( '"' !== $opening_quote && '"' !== $closing_quote ) {
174	$dynamic[ '/(?<=\A\|' . $spaces . ')"(\d[.,\d]*)"/' ] = $open_q_flag . '$1' . $closing_quote;
175	}
176
177	// Double quote at start, or preceded by (, {, <, [, -, or spaces, and not followed by spaces.
178	if ( '"' !== $opening_quote ) {
179	$dynamic[ '/(?<=\A\|[([{\-]\|<\|' . $spaces . ')"(?!' . $spaces . ')/' ] = $open_q_flag;
180	}
181
182	$dynamic_characters['quote'] = array_keys( $dynamic );
183	$dynamic_replacements['quote'] = array_values( $dynamic );
184	$dynamic = array();
185
186	// Dashes and spaces
187	$dynamic[ '/---/' ] = $em_dash;
188	$dynamic[ '/(?<=^\|' . $spaces . ')--(?=$\|' . $spaces . ')/' ] = $em_dash;
189	$dynamic[ '/(?<!xn)--/' ] = $en_dash;
190	$dynamic[ '/(?<=^\|' . $spaces . ')-(?=$\|' . $spaces . ')/' ] = $en_dash;
191
192	$dynamic_characters['dash'] = array_keys( $dynamic );
193	$dynamic_replacements['dash'] = array_values( $dynamic );
194	}
195
196	// Must do this every time in case plugins use these filters in a context sensitive manner
197	/**
198	* Filter the list of HTML elements not to texturize.
199	*
200	* @since 2.8.0
201	*
202	* @param array $default_no_texturize_tags An array of HTML element names.
203	*/
204	$no_texturize_tags = apply_filters( 'no_texturize_tags', $default_no_texturize_tags );
205	/**
206	* Filter the list of shortcodes not to texturize.
207	*
208	* @since 2.8.0
209	*
210	* @param array $default_no_texturize_shortcodes An array of shortcode names.
211	*/
212	$no_texturize_shortcodes = apply_filters( 'no_texturize_shortcodes', $default_no_texturize_shortcodes );
213
214	$no_texturize_tags_stack = array();
215	$no_texturize_shortcodes_stack = array();
216
217	// Look for shortcodes and HTML elements.
218
219	preg_match_all( '@\[/?([^<>&/\[\]\x00-\x20]++)@', $text, $matches );
220	$tagnames = array_intersect( array_keys( $shortcode_tags ), $matches[1] );
221	$found_shortcodes = ! empty( $tagnames );
222	$shortcode_regex = $found_shortcodes ? _get_wptexturize_shortcode_regex( $tagnames ) : '';
223	$regex = _get_wptexturize_split_regex( $shortcode_regex );
224
225	$textarr = preg_split( $regex, $text, -1, PREG_SPLIT_DELIM_CAPTURE \| PREG_SPLIT_NO_EMPTY );
226
227	foreach ( $textarr as &$curl ) {
228	// Only call _wptexturize_pushpop_element if $curl is a delimiter.
229	$first = $curl[0];
230	if ( '<' === $first ) {
231	if ( '<!--' === substr( $curl, 0, 4 ) ) {
232	// This is an HTML comment delimiter.
233	continue;
234	} else {
235	// This is an HTML element delimiter.
236	_wptexturize_pushpop_element( $curl, $no_texturize_tags_stack, $no_texturize_tags );
237	}
238
239	} elseif ( '' === trim( $curl ) ) {
240	// This is a newline between delimiters. Performance improves when we check this.
241	continue;
242
243	} elseif ( '[' === $first && $found_shortcodes && 1 === preg_match( '/^' . $shortcode_regex . '$/', $curl ) ) {
244	// This is a shortcode delimiter.
245
246	if ( '[[' !== substr( $curl, 0, 2 ) && ']]' !== substr( $curl, -2 ) ) {
247	// Looks like a normal shortcode.
248	_wptexturize_pushpop_element( $curl, $no_texturize_shortcodes_stack, $no_texturize_shortcodes );
249	} else {
250	// Looks like an escaped shortcode.
251	continue;
252	}
253
254	} elseif ( empty( $no_texturize_shortcodes_stack ) && empty( $no_texturize_tags_stack ) ) {
255	// This is neither a delimiter, nor is this content inside of no_texturize pairs. Do texturize.
256
257	$curl = str_replace( $static_characters, $static_replacements, $curl );
258
259	if ( false !== strpos( $curl, "'" ) ) {
260	$curl = preg_replace( $dynamic_characters['apos'], $dynamic_replacements['apos'], $curl );
261	$curl = wptexturize_primes( $curl, "'", $prime, $open_sq_flag, $closing_single_quote );
262	$curl = str_replace( $apos_flag, $apos, $curl );
263	$curl = str_replace( $open_sq_flag, $opening_single_quote, $curl );
264	}
265	if ( false !== strpos( $curl, '"' ) ) {
266	$curl = preg_replace( $dynamic_characters['quote'], $dynamic_replacements['quote'], $curl );
267	$curl = wptexturize_primes( $curl, '"', $double_prime, $open_q_flag, $closing_quote );
268	$curl = str_replace( $open_q_flag, $opening_quote, $curl );
269	}
270	if ( false !== strpos( $curl, '-' ) ) {
271	$curl = preg_replace( $dynamic_characters['dash'], $dynamic_replacements['dash'], $curl );
272	}
273
274	// 9x9 (times), but never 0x9999
275	if ( 1 === preg_match( '/(?<=\d)x\d/', $curl ) ) {
276	// Searching for a digit is 10 times more expensive than for the x, so we avoid doing this one!
277	$curl = preg_replace( '/\b(\d(?(?<=0)[\d\.,]+\|[\d\.,]))x(\d[\d\.,])\b/', '$1×$2', $curl );
278	}
279
280	// Replace each & with & unless it already looks like an entity.
281	$curl = preg_replace( '/&(?!#(?:\d+\|x[a-f0-9]+);\|[a-z1-4]{1,8};)/i', '&', $curl );
282	}
283	}
284
285	return implode( '', $textarr );
286	}
287
288	/**
289	* Implements a logic tree to determine whether or not "7'." represents seven feet,
290	* then converts the special char into either a prime char or a closing quote char.
291	*
292	* @since 4.3.0
293	*
294	* @param string $haystack The plain text to be searched.
295	* @param string $needle The character to search for such as ' or ".
296	* @param string $prime The prime char to use for replacement.
297	* @param string $open_quote The opening quote char. Opening quote replacement must be
298	* accomplished already.
299	* @param string $close_quote The closing quote char to use for replacement.
300	* @return string The $haystack value after primes and quotes replacements.
301	*/
302	function wptexturize_primes( $haystack, $needle, $prime, $open_quote, $close_quote ) {
303	$spaces = wp_spaces_regexp();
304	$flag = '<!--wp-prime-or-quote-->';
305	$quote_pattern = "/$needle(?=\\Z\|[.,:;!?)}\\-\\]]\|>\|" . $spaces . ")/";
306	$prime_pattern = "/(?<=\\d)$needle/";
307	$flag_after_digit = "/(?<=\\d)$flag/";
308	$flag_no_digit = "/(?<!\\d)$flag/";
309
310	$sentences = explode( $open_quote, $haystack );
311
312	foreach ( $sentences as $key => &$sentence ) {
313	if ( false === strpos( $sentence, $needle ) ) {
314	continue;
315	} elseif ( 0 !== $key && 0 === substr_count( $sentence, $close_quote ) ) {
316	$sentence = preg_replace( $quote_pattern, $flag, $sentence, -1, $count );
317	if ( $count > 1 ) {
318	// This sentence appears to have multiple closing quotes. Attempt Vulcan logic.
319	$sentence = preg_replace( $flag_no_digit, $close_quote, $sentence, -1, $count2 );
320	if ( 0 === $count2 ) {
321	// Try looking for a quote followed by a period.
322	$count2 = substr_count( $sentence, "$flag." );
323	if ( $count2 > 0 ) {
324	// Assume the rightmost quote-period match is the end of quotation.
325	$pos = strrpos( $sentence, "$flag." );
326	} else {
327	// When all else fails, make the rightmost candidate a closing quote.
328	// This is most likely to be problematic in the context of bug #18549.
329	$pos = strrpos( $sentence, $flag );
330	}
331	$sentence = substr_replace( $sentence, $close_quote, $pos, strlen( $flag ) );
332	}
333	// Use conventional replacement on any remaining primes and quotes.
334	$sentence = preg_replace( $prime_pattern, $prime, $sentence );
335	$sentence = preg_replace( $flag_after_digit, $prime, $sentence );
336	$sentence = str_replace( $flag, $close_quote, $sentence );
337	} elseif ( 1 == $count ) {
338	// Found only one closing quote candidate, so give it priority over primes.
339	$sentence = str_replace( $flag, $close_quote, $sentence );
340	$sentence = preg_replace( $prime_pattern, $prime, $sentence );
341	} else {
342	// No closing quotes found. Just run primes pattern.
343	$sentence = preg_replace( $prime_pattern, $prime, $sentence );
344	}
345	} else {
346	$sentence = preg_replace( $prime_pattern, $prime, $sentence );
347	$sentence = preg_replace( $quote_pattern, $close_quote, $sentence );
348	}
349	if ( '"' == $needle && false !== strpos( $sentence, '"' ) ) {
350	$sentence = str_replace( '"', $close_quote, $sentence );
351	}
352	}
353
354	return implode( $open_quote, $sentences );
355	}
356
357	/**
358	* Search for disabled element tags. Push element to stack on tag open and pop
359	* on tag close.
360	*
361	* Assumes first char of $text is tag opening and last char is tag closing.
362	* Assumes second char of $text is optionally '/' to indicate closing as in </html>.
363	*
364	* @since 2.9.0
365	* @access private
366	*
367	* @param string $text Text to check. Must be a tag like `<html>` or `[shortcode]`.
368	* @param array $stack List of open tag elements.
369	* @param array $disabled_elements The tag names to match against. Spaces are not allowed in tag names.
370	*/
371	function _wptexturize_pushpop_element( $text, &$stack, $disabled_elements ) {
372	// Is it an opening tag or closing tag?
373	if ( '/' !== $text[1] ) {
374	$opening_tag = true;
375	$name_offset = 1;
376	} elseif ( 0 == count( $stack ) ) {
377	// Stack is empty. Just stop.
378	return;
379	} else {
380	$opening_tag = false;
381	$name_offset = 2;
382	}
383
384	// Parse out the tag name.
385	$space = strpos( $text, ' ' );
386	if ( false === $space ) {
387	$space = -1;
388	} else {
389	$space -= $name_offset;
390	}
391	$tag = substr( $text, $name_offset, $space );
392
393	// Handle disabled tags.
394	if ( in_array( $tag, $disabled_elements ) ) {
395	if ( $opening_tag ) {
396	/*
397	* This disables texturize until we find a closing tag of our type
398	* (e.g. <pre>) even if there was invalid nesting before that
399	*
400	* Example: in the case <pre>sadsadasd</code>"baba"</pre>
401	* "baba" won't be texturize
402	*/
403
404	array_push( $stack, $tag );
405	} elseif ( end( $stack ) == $tag ) {
406	array_pop( $stack );
407	}
408	}
409	}
410
411	/**
412	* Replaces double line-breaks with paragraph elements.
413	*
414	* A group of regex replaces used to identify text formatted with newlines and
415	* replace double line-breaks with HTML paragraph tags. The remaining line-breaks
416	* after conversion become <<br />> tags, unless $br is set to '0' or 'false'.
417	*
418	* @since 0.71
419	*
420	* @param string $pee The text which has to be formatted.
421	* @param bool $br Optional. If set, this will convert all remaining line-breaks
422	* after paragraphing. Default true.
423	* @return string Text which has been converted into correct paragraph tags.
424	*/
425	function wpautop( $pee, $br = true ) {
426	$pre_tags = array();
427
428	if ( trim($pee) === '' )
429	return '';
430
431	// Just to make things a little easier, pad the end.
432	$pee = $pee . "\n";
433
434	/*
435	* Pre tags shouldn't be touched by autop.
436	* Replace pre tags with placeholders and bring them back after autop.
437	*/
438	if ( strpos($pee, '<pre') !== false ) {
439	$pee_parts = explode( '</pre>', $pee );
440	$last_pee = array_pop($pee_parts);
441	$pee = '';
442	$i = 0;
443
444	foreach ( $pee_parts as $pee_part ) {
445	$start = strpos($pee_part, '<pre');
446
447	// Malformed html?
448	if ( $start === false ) {
449	$pee .= $pee_part;
450	continue;
451	}
452
453	$name = "<pre wp-pre-tag-$i></pre>";
454	$pre_tags[$name] = substr( $pee_part, $start ) . '</pre>';
455
456	$pee .= substr( $pee_part, 0, $start ) . $name;
457	$i++;
458	}
459
460	$pee .= $last_pee;
461	}
462	// Change multiple <br>s into two line breaks, which will turn into paragraphs.
463	$pee = preg_replace('\|<br\s/?>\s<br\s*/?>\|', "\n\n", $pee);
464
465	$allblocks = '(?:table\|thead\|tfoot\|caption\|col\|colgroup\|tbody\|tr\|td\|th\|div\|dl\|dd\|dt\|ul\|ol\|li\|pre\|form\|map\|area\|blockquote\|address\|math\|style\|p\|h[1-6]\|hr\|fieldset\|legend\|section\|article\|aside\|hgroup\|header\|footer\|nav\|figure\|figcaption\|details\|menu\|summary)';
466
467	// Add a single line break above block-level opening tags.
468	$pee = preg_replace('!(<' . $allblocks . '[\s/>])!', "\n$1", $pee);
469
470	// Add a double line break below block-level closing tags.
471	$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
472
473	// Standardize newline characters to "\n".
474	$pee = str_replace(array("\r\n", "\r"), "\n", $pee);
475
476	// Find newlines in all elements and add placeholders.
477	$pee = wp_replace_in_html_tags( $pee, array( "\n" => " <!-- wpnl --> " ) );
478
479	// Collapse line breaks before and after <option> elements so they don't get autop'd.
480	if ( strpos( $pee, '<option' ) !== false ) {
481	$pee = preg_replace( '\|\s*<option\|', '<option', $pee );
482	$pee = preg_replace( '\|</option>\s*\|', '</option>', $pee );
483	}
484
485	/*
486	* Collapse line breaks inside <object> elements, before <param> and <embed> elements
487	* so they don't get autop'd.
488	*/
489	if ( strpos( $pee, '</object>' ) !== false ) {
490	$pee = preg_replace( '\|(<object[^>]>)\s\|', '$1', $pee );
491	$pee = preg_replace( '\|\s*</object>\|', '</object>', $pee );
492	$pee = preg_replace( '%\s(</?(?:param\|embed)[^>]>)\s*%', '$1', $pee );
493	}
494
495	/*
496	* Collapse line breaks inside <audio> and <video> elements,
497	* before and after <source> and <track> elements.
498	*/
499	if ( strpos( $pee, '<source' ) !== false \|\| strpos( $pee, '<track' ) !== false ) {
500	$pee = preg_replace( '%([<\[](?:audio\|video)[^>\]][>\]])\s%', '$1', $pee );
501	$pee = preg_replace( '%\s*([<\[]/(?:audio\|video)[>\]])%', '$1', $pee );
502	$pee = preg_replace( '%\s(<(?:source\|track)[^>]>)\s*%', '$1', $pee );
503	}
504
505	// Remove more than two contiguous line breaks.
506	$pee = preg_replace("/\n\n+/", "\n\n", $pee);
507
508	// Split up the contents into an array of strings, separated by double line breaks.
509	$pees = preg_split('/\n\s*\n/', $pee, -1, PREG_SPLIT_NO_EMPTY);
510
511	// Reset $pee prior to rebuilding.
512	$pee = '';
513
514	// Rebuild the content as a string, wrapping every bit with a <p>.
515	foreach ( $pees as $tinkle ) {
516	$pee .= '<p>' . trim($tinkle, "\n") . "</p>\n";
517	}
518
519	// Under certain strange conditions it could create a P of entirely whitespace.
520	$pee = preg_replace('\|<p>\s*</p>\|', '', $pee);
521
522	// Add a closing <p> inside <div>, <address>, or <form> tag if missing.
523	$pee = preg_replace('!<p>([^<]+)</(div\|address\|form)>!', "<p>$1</p></$2>", $pee);
524
525	// If an opening or closing block element tag is wrapped in a <p>, unwrap it.
526	$pee = preg_replace('!<p>\s(</?' . $allblocks . '[^>]>)\s*</p>!', "$1", $pee);
527
528	// In some cases <li> may get wrapped in <p>, fix them.
529	$pee = preg_replace("\|<p>(<li.+?)</p>\|", "$1", $pee);
530
531	// If a <blockquote> is wrapped with a <p>, move it inside the <blockquote>.
532	$pee = preg_replace('\|<p><blockquote([^>]*)>\|i', "<blockquote$1><p>", $pee);
533	$pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);
534
535	// If an opening or closing block element tag is preceded by an opening <p> tag, remove it.
536	$pee = preg_replace('!<p>\s(</?' . $allblocks . '[^>]>)!', "$1", $pee);
537
538	// If an opening or closing block element tag is followed by a closing <p> tag, remove it.
539	$pee = preg_replace('!(</?' . $allblocks . '[^>]>)\s</p>!', "$1", $pee);
540
541	// Optionally insert line breaks.
542	if ( $br ) {
543	// Replace newlines that shouldn't be touched with a placeholder.
544	$pee = preg_replace_callback('/<(script\|style).*?<\/\\1>/s', '_autop_newline_preservation_helper', $pee);
545
546	// Normalize <br>
547	$pee = str_replace( array( '<br>', '<br/>' ), '<br />', $pee );
548
549	// Replace any new line characters that aren't preceded by a <br /> with a <br />.
550	$pee = preg_replace('\|(?<!<br />)\s*\n\|', "<br />\n", $pee);
551
552	// Replace newline placeholders with newlines.
553	$pee = str_replace('<WPPreserveNewline />', "\n", $pee);
554	}
555
556	// If a <br /> tag is after an opening or closing block tag, remove it.
557	$pee = preg_replace('!(</?' . $allblocks . '[^>]>)\s<br />!', "$1", $pee);
558
559	// If a <br /> tag is before a subset of opening or closing block tags, remove it.
560	$pee = preg_replace('!<br />(\s</?(?:p\|li\|div\|dl\|dd\|dt\|th\|pre\|td\|ul\|ol)[^>]>)!', '$1', $pee);
561	$pee = preg_replace( "\|\n</p>$\|", '</p>', $pee );
562
563	// Replace placeholder <pre> tags with their original content.
564	if ( !empty($pre_tags) )
565	$pee = str_replace(array_keys($pre_tags), array_values($pre_tags), $pee);
566
567	// Restore newlines in all elements.
568	if ( false !== strpos( $pee, '<!-- wpnl -->' ) ) {
569	$pee = str_replace( array( ' <!-- wpnl --> ', '<!-- wpnl -->' ), "\n", $pee );
570	}
571
572	return $pee;
573	}
574
575	/**
576	* Separate HTML elements and comments from the text.
577	*
578	* @since 4.2.4
579	*
580	* @param string $input The text which has to be formatted.
581	* @return array The formatted text.
582	*/
583	function wp_html_split( $input ) {
584	return preg_split( get_html_split_regex(), $input, -1, PREG_SPLIT_DELIM_CAPTURE );
585	}
586
587	/**
588	* Retrieve the regular expression for an HTML element.
589	*
590	* @since 4.4.0
591	*
592	* @return string The regular expression
593	*/
594	function get_html_split_regex() {
595	static $regex;
596
597	if ( ! isset( $regex ) ) {
598	$comments =
599	'!' // Start of comment, after the <.
600	. '(?:' // Unroll the loop: Consume everything until --> is found.
601	. '-(?!->)' // Dash not followed by end of comment.
602	. '[^\-]*+' // Consume non-dashes.
603	. ')*+' // Loop possessively.
604	. '(?:-->)?'; // End of comment. If not found, match all input.
605
606	$cdata =
607	'!\[CDATA\[' // Start of comment, after the <.
608	. '[^\]]*+' // Consume non-].
609	. '(?:' // Unroll the loop: Consume everything until ]]> is found.
610	. '](?!]>)' // One ] not followed by end of comment.
611	. '[^\]]*+' // Consume non-].
612	. ')*+' // Loop possessively.
613	. '(?:]]>)?'; // End of comment. If not found, match all input.
614
615	$escaped =
616	'(?=' // Is the element escaped?
617	. '!--'
618	. '\|'
619	. '!\[CDATA\['
620	. ')'
621	. '(?(?=!-)' // If yes, which type?
622	. $comments
623	. '\|'
624	. $cdata
625	. ')';
626
627	$regex =
628	'/(' // Capture the entire match.
629	. '<' // Find start of element.
630	. '(?' // Conditional expression follows.
631	. $escaped // Find end of escaped element.
632	. '\|' // ... else ...
633	. '[^>]*>?' // Find end of normal element.
634	. ')'
635	. ')/';
636	}
637
638	return $regex;
639	}
640
641	/**
642	* Retrieve the combined regular expression for HTML and shortcodes.
643	*
644	* @access private
645	* @ignore
646	* @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
647	* @since 4.4.0
648	*
649	* @param string $shortcode_regex The result from _get_wptexturize_shortcode_regex(). Optional.
650	* @return string The regular expression
651	*/
652	function _get_wptexturize_split_regex( $shortcode_regex = '' ) {
653	static $html_regex;
654
655	if ( ! isset( $html_regex ) ) {
656	$comment_regex =
657	'!' // Start of comment, after the <.
658	. '(?:' // Unroll the loop: Consume everything until --> is found.
659	. '-(?!->)' // Dash not followed by end of comment.
660	. '[^\-]*+' // Consume non-dashes.
661	. ')*+' // Loop possessively.
662	. '(?:-->)?'; // End of comment. If not found, match all input.
663
664	$html_regex = // Needs replaced with wp_html_split() per Shortcode API Roadmap.
665	'<' // Find start of element.
666	. '(?(?=!--)' // Is this a comment?
667	. $comment_regex // Find end of comment.
668	. '\|'
669	. '[^>]*>?' // Find end of element. If not found, match all input.
670	. ')';
671	}
672
673	if ( empty( $shortcode_regex ) ) {
674	$regex = '/(' . $html_regex . ')/';
675	} else {
676	$regex = '/(' . $html_regex . '\|' . $shortcode_regex . ')/';
677	}
678
679	return $regex;
680	}
681
682	/**
683	* Retrieve the regular expression for shortcodes.
684	*
685	* @access private
686	* @ignore
687	* @internal This function will be removed in 4.5.0 per Shortcode API Roadmap.
688	* @since 4.4.0
689	*
690	* @param array $tagnames List of shortcodes to find.
691	* @return string The regular expression
692	*/
693	function _get_wptexturize_shortcode_regex( $tagnames ) {
694	$tagregexp = join( '\|', array_map( 'preg_quote', $tagnames ) );
695	$tagregexp = "(?:$tagregexp)(?=[\\s\\]\\/])"; // Excerpt of get_shortcode_regex().
696	$regex =
697	'\[' // Find start of shortcode.
698	. '[\/\[]?' // Shortcodes may begin with [/ or [[
699	. $tagregexp // Only match registered shortcodes, because performance.
700	. '(?:'
701	. '[^\[\]<>]+' // Shortcodes do not contain other shortcodes. Quantifier critical.
702	. '\|'
703	. '<[^\[\]>]*>' // HTML elements permitted. Prevents matching ] before >.
704	. ')*+' // Possessive critical.
705	. '\]' // Find end of shortcode.
706	. '\]?'; // Shortcodes may end with ]]
707
708	return $regex;
709	}
710
711	/**
712	* Replace characters or phrases within HTML elements only.
713	*
714	* @since 4.2.3
715	*
716	* @param string $haystack The text which has to be formatted.
717	* @param array $replace_pairs In the form array('from' => 'to', ...).
718	* @return string The formatted text.
719	*/
720	function wp_replace_in_html_tags( $haystack, $replace_pairs ) {
721	// Find all elements.
722	$textarr = wp_html_split( $haystack );
723	$changed = false;
724
725	// Optimize when searching for one item.
726	if ( 1 === count( $replace_pairs ) ) {
727	// Extract $needle and $replace.
728	foreach ( $replace_pairs as $needle => $replace );
729
730	// Loop through delimiters (elements) only.
731	for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
732	if ( false !== strpos( $textarr[$i], $needle ) ) {
733	$textarr[$i] = str_replace( $needle, $replace, $textarr[$i] );
734	$changed = true;
735	}
736	}
737	} else {
738	// Extract all $needles.
739	$needles = array_keys( $replace_pairs );
740
741	// Loop through delimiters (elements) only.
742	for ( $i = 1, $c = count( $textarr ); $i < $c; $i += 2 ) {
743	foreach ( $needles as $needle ) {
744	if ( false !== strpos( $textarr[$i], $needle ) ) {
745	$textarr[$i] = strtr( $textarr[$i], $replace_pairs );
746	$changed = true;
747	// After one strtr() break out of the foreach loop and look at next element.
748	break;
749	}
750	}
751	}
752	}
753
754	if ( $changed ) {
755	$haystack = implode( $textarr );
756	}
757
758	return $haystack;
759	}
760
761	/**
762	* Newline preservation help function for wpautop
763	*
764	* @since 3.1.0
765	* @access private
766	*
767	* @param array $matches preg_replace_callback matches array
768	* @return string
769	*/
770	function _autop_newline_preservation_helper( $matches ) {
771	return str_replace( "\n", "<WPPreserveNewline />", $matches[0] );
772	}
773
774	/**
775	* Don't auto-p wrap shortcodes that stand alone
776	*
777	* Ensures that shortcodes are not wrapped in `<p>...</p>`.
778	*
779	* @since 2.9.0
780	*
781	* @global array $shortcode_tags
782	*
783	* @param string $pee The content.
784	* @return string The filtered content.
785	*/
786	function shortcode_unautop( $pee ) {
787	global $shortcode_tags;
788
789	if ( empty( $shortcode_tags ) \|\| !is_array( $shortcode_tags ) ) {
790	return $pee;
791	}
792
793	$tagregexp = join( '\|', array_map( 'preg_quote', array_keys( $shortcode_tags ) ) );
794	$spaces = wp_spaces_regexp();
795
796	$pattern =
797	'/'
798	. '<p>' // Opening paragraph
799	. '(?:' . $spaces . ')*+' // Optional leading whitespace
800	. '(' // 1: The shortcode
801	. '\\[' // Opening bracket
802	. "($tagregexp)" // 2: Shortcode name
803	. '(?![\\w-])' // Not followed by word character or hyphen
804	// Unroll the loop: Inside the opening shortcode tag
805	. '[^\\]\\/]*' // Not a closing bracket or forward slash
806	. '(?:'
807	. '\\/(?!\\])' // A forward slash not followed by a closing bracket
808	. '[^\\]\\/]*' // Not a closing bracket or forward slash
809	. ')*?'
810	. '(?:'
811	. '\\/\\]' // Self closing tag and closing bracket
812	. '\|'
813	. '\\]' // Closing bracket
814	. '(?:' // Unroll the loop: Optionally, anything between the opening and closing shortcode tags
815	. '[^\\[]*+' // Not an opening bracket
816	. '(?:'
817	. '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
818	. '[^\\[]*+' // Not an opening bracket
819	. ')*+'
820	. '\\[\\/\\2\\]' // Closing shortcode tag
821	. ')?'
822	. ')'
823	. ')'
824	. '(?:' . $spaces . ')*+' // optional trailing whitespace
825	. '<\\/p>' // closing paragraph
826	. '/';
827
828	return preg_replace( $pattern, '$1', $pee );
829	}
830
831	/**
832	* Checks to see if a string is utf8 encoded.
833	*
834	* NOTE: This function checks for 5-Byte sequences, UTF8
835	* has Bytes Sequences with a maximum length of 4.
836	*
837	* @author bmorel at ssi dot fr (modified)
838	* @since 1.2.1
839	*
840	* @param string $str The string to be checked
841	* @return bool True if $str fits a UTF-8 model, false otherwise.
842	*/
843	function seems_utf8( $str ) {
844	mbstring_binary_safe_encoding();
845	$length = strlen($str);
846	reset_mbstring_encoding();
847	for ($i=0; $i < $length; $i++) {
848	$c = ord($str[$i]);
849	if ($c < 0x80) $n = 0; // 0bbbbbbb
850	elseif (($c & 0xE0) == 0xC0) $n=1; // 110bbbbb
851	elseif (($c & 0xF0) == 0xE0) $n=2; // 1110bbbb
852	elseif (($c & 0xF8) == 0xF0) $n=3; // 11110bbb
853	elseif (($c & 0xFC) == 0xF8) $n=4; // 111110bb
854	elseif (($c & 0xFE) == 0xFC) $n=5; // 1111110b
855	else return false; // Does not match any model
856	for ($j=0; $j<$n; $j++) { // n bytes matching 10bbbbbb follow ?
857	if ((++$i == $length) \|\| ((ord($str[$i]) & 0xC0) != 0x80))
858	return false;
859	}
860	}
861	return true;
862	}
863
864	/**
865	* Converts a number of special characters into their HTML entities.
866	*
867	* Specifically deals with: &, <, >, ", and '.
868	*
869	* $quote_style can be set to ENT_COMPAT to encode " to
870	* ", or ENT_QUOTES to do both. Default is ENT_NOQUOTES where no quotes are encoded.
871	*
872	* @since 1.2.2
873	* @access private
874	*
875	* @staticvar string $_charset
876	*
877	* @param string $string The text which is to be encoded.
878	* @param int\|string $quote_style Optional. Converts double quotes if set to ENT_COMPAT,
879	* both single and double if set to ENT_QUOTES or none if set to ENT_NOQUOTES.
880	* Also compatible with old values; converting single quotes if set to 'single',
881	* double if set to 'double' or both if otherwise set.
882	* Default is ENT_NOQUOTES.
883	* @param string $charset Optional. The character encoding of the string. Default is false.
884	* @param bool $double_encode Optional. Whether to encode existing html entities. Default is false.
885	* @return string The encoded text with HTML entities.
886	*/
887	function _wp_specialchars( $string, $quote_style = ENT_NOQUOTES, $charset = false, $double_encode = false ) {
888	$string = (string) $string;
889
890	if ( 0 === strlen( $string ) )
891	return '';
892
893	// Don't bother if there are no specialchars - saves some processing
894	if ( ! preg_match( '/[&<>"\']/', $string ) )
895	return $string;
896
897	// Account for the previous behaviour of the function when the $quote_style is not an accepted value
898	if ( empty( $quote_style ) )
899	$quote_style = ENT_NOQUOTES;
900	elseif ( ! in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) )
901	$quote_style = ENT_QUOTES;
902
903	// Store the site charset as a static to avoid multiple calls to wp_load_alloptions()
904	if ( ! $charset ) {
905	static $_charset = null;
906	if ( ! isset( $_charset ) ) {
907	$alloptions = wp_load_alloptions();
908	$_charset = isset( $alloptions['blog_charset'] ) ? $alloptions['blog_charset'] : '';
909	}
910	$charset = $_charset;
911	}
912
913	if ( in_array( $charset, array( 'utf8', 'utf-8', 'UTF8' ) ) )
914	$charset = 'UTF-8';
915
916	$_quote_style = $quote_style;
917
918	if ( $quote_style === 'double' ) {
919	$quote_style = ENT_COMPAT;
920	$_quote_style = ENT_COMPAT;
921	} elseif ( $quote_style === 'single' ) {
922	$quote_style = ENT_NOQUOTES;
923	}
924
925	if ( ! $double_encode ) {
926	// Guarantee every &entity; is valid, convert &garbage; into &garbage;
927	// This is required for PHP < 5.4.0 because ENT_HTML401 flag is unavailable.
928	$string = wp_kses_normalize_entities( $string );
929	}
930
931	$string = @htmlspecialchars( $string, $quote_style, $charset, $double_encode );
932
933	// Backwards compatibility
934	if ( 'single' === $_quote_style )
935	$string = str_replace( "'", ''', $string );
936
937	return $string;
938	}
939
940	/**
941	* Converts a number of HTML entities into their special characters.
942	*
943	* Specifically deals with: &, <, >, ", and '.
944	*
945	* $quote_style can be set to ENT_COMPAT to decode " entities,
946	* or ENT_QUOTES to do both " and '. Default is ENT_NOQUOTES where no quotes are decoded.
947	*
948	* @since 2.8.0
949	*
950	* @param string $string The text which is to be decoded.
951	* @param string\|int $quote_style Optional. Converts double quotes if set to ENT_COMPAT,
952	* both single and double if set to ENT_QUOTES or
953	* none if set to ENT_NOQUOTES.
954	* Also compatible with old _wp_specialchars() values;
955	* converting single quotes if set to 'single',
956	* double if set to 'double' or both if otherwise set.
957	* Default is ENT_NOQUOTES.
958	* @return string The decoded text without HTML entities.
959	*/
960	function wp_specialchars_decode( $string, $quote_style = ENT_NOQUOTES ) {
961	$string = (string) $string;
962
963	if ( 0 === strlen( $string ) ) {
964	return '';
965	}
966
967	// Don't bother if there are no entities - saves a lot of processing
968	if ( strpos( $string, '&' ) === false ) {
969	return $string;
970	}
971
972	// Match the previous behaviour of _wp_specialchars() when the $quote_style is not an accepted value
973	if ( empty( $quote_style ) ) {
974	$quote_style = ENT_NOQUOTES;
975	} elseif ( !in_array( $quote_style, array( 0, 2, 3, 'single', 'double' ), true ) ) {
976	$quote_style = ENT_QUOTES;
977	}
978
979	// More complete than get_html_translation_table( HTML_SPECIALCHARS )
980	$single = array( ''' => '\'', ''' => '\'' );
981	$single_preg = array( '/&#039;/' => ''', '/&#x027;/i' => ''' );
982	$double = array( '"' => '"', '"' => '"', '"' => '"' );
983	$double_preg = array( '/&#034;/' => '"', '/&#x022;/i' => '"' );
984	$others = array( '<' => '<', '<' => '<', '>' => '>', '>' => '>', '&' => '&', '&' => '&', '&' => '&' );
985	$others_preg = array( '/&#060;/' => '<', '/&#062;/' => '>', '/&#038;/' => '&', '/&#x026;/i' => '&' );
986
987	if ( $quote_style === ENT_QUOTES ) {
988	$translation = array_merge( $single, $double, $others );
989	$translation_preg = array_merge( $single_preg, $double_preg, $others_preg );
990	} elseif ( $quote_style === ENT_COMPAT \|\| $quote_style === 'double' ) {
991	$translation = array_merge( $double, $others );
992	$translation_preg = array_merge( $double_preg, $others_preg );
993	} elseif ( $quote_style === 'single' ) {
994	$translation = array_merge( $single, $others );
995	$translation_preg = array_merge( $single_preg, $others_preg );
996	} elseif ( $quote_style === ENT_NOQUOTES ) {
997	$translation = $others;
998	$translation_preg = $others_preg;
999	}
1000
1001	// Remove zero padding on numeric entities
1002	$string = preg_replace( array_keys( $translation_preg ), array_values( $translation_preg ), $string );
1003
1004	// Replace characters according to translation table
1005	return strtr( $string, $translation );
1006	}
1007
1008	/**
1009	* Checks for invalid UTF8 in a string.
1010	*
1011	* @since 2.8.0
1012	*
1013	* @staticvar bool $is_utf8
1014	* @staticvar bool $utf8_pcre
1015	*
1016	* @param string $string The text which is to be checked.
1017	* @param bool $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
1018	* @return string The checked text.
1019	*/
1020	function wp_check_invalid_utf8( $string, $strip = false ) {
1021	$string = (string) $string;
1022
1023	if ( 0 === strlen( $string ) ) {
1024	return '';
1025	}
1026
1027	// Store the site charset as a static to avoid multiple calls to get_option()
1028	static $is_utf8 = null;
1029	if ( ! isset( $is_utf8 ) ) {
1030	$is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );
1031	}
1032	if ( ! $is_utf8 ) {
1033	return $string;
1034	}
1035
1036	// Check for support for utf8 in the installed PCRE library once and store the result in a static
1037	static $utf8_pcre = null;
1038	if ( ! isset( $utf8_pcre ) ) {
1039	$utf8_pcre = @preg_match( '/^./u', 'a' );
1040	}
1041	// We can't demand utf8 in the PCRE installation, so just return the string in those cases
1042	if ( !$utf8_pcre ) {
1043	return $string;
1044	}
1045
1046	// preg_match fails when it encounters invalid UTF8 in $string
1047	if ( 1 === @preg_match( '/^./us', $string ) ) {
1048	return $string;
1049	}
1050
1051	// Attempt to strip the bad chars if requested (not recommended)
1052	if ( $strip && function_exists( 'iconv' ) ) {
1053	return iconv( 'utf-8', 'utf-8', $string );
1054	}
1055
1056	return '';
1057	}
1058
1059	/**
1060	* Encode the Unicode values to be used in the URI.
1061	*
1062	* @since 1.5.0
1063	*
1064	* @param string $utf8_string
1065	* @param int $length Max length of the string
1066	* @return string String with Unicode encoded for URI.
1067	*/
1068	function utf8_uri_encode( $utf8_string, $length = 0 ) {
1069	$unicode = '';
1070	$values = array();
1071	$num_octets = 1;
1072	$unicode_length = 0;
1073
1074	mbstring_binary_safe_encoding();
1075	$string_length = strlen( $utf8_string );
1076	reset_mbstring_encoding();
1077
1078	for ($i = 0; $i < $string_length; $i++ ) {
1079
1080	$value = ord( $utf8_string[ $i ] );
1081
1082	if ( $value < 128 ) {
1083	if ( $length && ( $unicode_length >= $length ) )
1084	break;
1085	$unicode .= chr($value);
1086	$unicode_length++;
1087	} else {
1088	if ( count( $values ) == 0 ) {
1089	if ( $value < 224 ) {
1090	$num_octets = 2;
1091	} elseif ( $value < 240 ) {
1092	$num_octets = 3;
1093	} else {
1094	$num_octets = 4;
1095	}
1096	}
1097
1098	$values[] = $value;
1099
1100	if ( $length && ( $unicode_length + ($num_octets * 3) ) > $length )
1101	break;
1102	if ( count( $values ) == $num_octets ) {
1103	for ( $j = 0; $j < $num_octets; $j++ ) {
1104	$unicode .= '%' . dechex( $values[ $j ] );
1105	}
1106
1107	$unicode_length += $num_octets * 3;
1108
1109	$values = array();
1110	$num_octets = 1;
1111	}
1112	}
1113	}
1114
1115	return $unicode;
1116	}
1117
1118	/**
1119	* Converts all accent characters to ASCII characters.
1120	*
1121	* If there are no accent characters, then the string given is just returned.
1122	*
1123	* @since 1.2.1
1124	*
1125	* @param string $string Text that might have accent characters
1126	* @return string Filtered string with replaced "nice" characters.
1127	*/
1128	function remove_accents( $string ) {
1129	if ( !preg_match('/[\x80-\xff]/', $string) )
1130	return $string;
1131
1132	if (seems_utf8($string)) {
1133	$chars = array(
1134	// Decompositions for Latin-1 Supplement
1135	chr(194).chr(170) => 'a', chr(194).chr(186) => 'o',
1136	chr(195).chr(128) => 'A', chr(195).chr(129) => 'A',
1137	chr(195).chr(130) => 'A', chr(195).chr(131) => 'A',
1138	chr(195).chr(132) => 'A', chr(195).chr(133) => 'A',
1139	chr(195).chr(134) => 'AE',chr(195).chr(135) => 'C',
1140	chr(195).chr(136) => 'E', chr(195).chr(137) => 'E',
1141	chr(195).chr(138) => 'E', chr(195).chr(139) => 'E',
1142	chr(195).chr(140) => 'I', chr(195).chr(141) => 'I',
1143	chr(195).chr(142) => 'I', chr(195).chr(143) => 'I',
1144	chr(195).chr(144) => 'D', chr(195).chr(145) => 'N',
1145	chr(195).chr(146) => 'O', chr(195).chr(147) => 'O',
1146	chr(195).chr(148) => 'O', chr(195).chr(149) => 'O',
1147	chr(195).chr(150) => 'O', chr(195).chr(153) => 'U',
1148	chr(195).chr(154) => 'U', chr(195).chr(155) => 'U',
1149	chr(195).chr(156) => 'U', chr(195).chr(157) => 'Y',
1150	chr(195).chr(158) => 'TH',chr(195).chr(159) => 's',
1151	chr(195).chr(160) => 'a', chr(195).chr(161) => 'a',
1152	chr(195).chr(162) => 'a', chr(195).chr(163) => 'a',
1153	chr(195).chr(164) => 'a', chr(195).chr(165) => 'a',
1154	chr(195).chr(166) => 'ae',chr(195).chr(167) => 'c',
1155	chr(195).chr(168) => 'e', chr(195).chr(169) => 'e',
1156	chr(195).chr(170) => 'e', chr(195).chr(171) => 'e',
1157	chr(195).chr(172) => 'i', chr(195).chr(173) => 'i',
1158	chr(195).chr(174) => 'i', chr(195).chr(175) => 'i',
1159	chr(195).chr(176) => 'd', chr(195).chr(177) => 'n',
1160	chr(195).chr(178) => 'o', chr(195).chr(179) => 'o',
1161	chr(195).chr(180) => 'o', chr(195).chr(181) => 'o',
1162	chr(195).chr(182) => 'o', chr(195).chr(184) => 'o',
1163	chr(195).chr(185) => 'u', chr(195).chr(186) => 'u',
1164	chr(195).chr(187) => 'u', chr(195).chr(188) => 'u',
1165	chr(195).chr(189) => 'y', chr(195).chr(190) => 'th',
1166	chr(195).chr(191) => 'y', chr(195).chr(152) => 'O',
1167	// Decompositions for Latin Extended-A
1168	chr(196).chr(128) => 'A', chr(196).chr(129) => 'a',
1169	chr(196).chr(130) => 'A', chr(196).chr(131) => 'a',
1170	chr(196).chr(132) => 'A', chr(196).chr(133) => 'a',
1171	chr(196).chr(134) => 'C', chr(196).chr(135) => 'c',
1172	chr(196).chr(136) => 'C', chr(196).chr(137) => 'c',
1173	chr(196).chr(138) => 'C', chr(196).chr(139) => 'c',
1174	chr(196).chr(140) => 'C', chr(196).chr(141) => 'c',
1175	chr(196).chr(142) => 'D', chr(196).chr(143) => 'd',
1176	chr(196).chr(144) => 'D', chr(196).chr(145) => 'd',
1177	chr(196).chr(146) => 'E', chr(196).chr(147) => 'e',
1178	chr(196).chr(148) => 'E', chr(196).chr(149) => 'e',
1179	chr(196).chr(150) => 'E', chr(196).chr(151) => 'e',
1180	chr(196).chr(152) => 'E', chr(196).chr(153) => 'e',
1181	chr(196).chr(154) => 'E', chr(196).chr(155) => 'e',
1182	chr(196).chr(156) => 'G', chr(196).chr(157) => 'g',
1183	chr(196).chr(158) => 'G', chr(196).chr(159) => 'g',
1184	chr(196).chr(160) => 'G', chr(196).chr(161) => 'g',
1185	chr(196).chr(162) => 'G', chr(196).chr(163) => 'g',
1186	chr(196).chr(164) => 'H', chr(196).chr(165) => 'h',
1187	chr(196).chr(166) => 'H', chr(196).chr(167) => 'h',
1188	chr(196).chr(168) => 'I', chr(196).chr(169) => 'i',
1189	chr(196).chr(170) => 'I', chr(196).chr(171) => 'i',
1190	chr(196).chr(172) => 'I', chr(196).chr(173) => 'i',
1191	chr(196).chr(174) => 'I', chr(196).chr(175) => 'i',
1192	chr(196).chr(176) => 'I', chr(196).chr(177) => 'i',
1193	chr(196).chr(178) => 'IJ',chr(196).chr(179) => 'ij',
1194	chr(196).chr(180) => 'J', chr(196).chr(181) => 'j',
1195	chr(196).chr(182) => 'K', chr(196).chr(183) => 'k',
1196	chr(196).chr(184) => 'k', chr(196).chr(185) => 'L',
1197	chr(196).chr(186) => 'l', chr(196).chr(187) => 'L',
1198	chr(196).chr(188) => 'l', chr(196).chr(189) => 'L',
1199	chr(196).chr(190) => 'l', chr(196).chr(191) => 'L',
1200	chr(197).chr(128) => 'l', chr(197).chr(129) => 'L',
1201	chr(197).chr(130) => 'l', chr(197).chr(131) => 'N',
1202	chr(197).chr(132) => 'n', chr(197).chr(133) => 'N',
1203	chr(197).chr(134) => 'n', chr(197).chr(135) => 'N',
1204	chr(197).chr(136) => 'n', chr(197).chr(137) => 'N',
1205	chr(197).chr(138) => 'n', chr(197).chr(139) => 'N',
1206	chr(197).chr(140) => 'O', chr(197).chr(141) => 'o',
1207	chr(197).chr(142) => 'O', chr(197).chr(143) => 'o',
1208	chr(197).chr(144) => 'O', chr(197).chr(145) => 'o',
1209	chr(197).chr(146) => 'OE',chr(197).chr(147) => 'oe',
1210	chr(197).chr(148) => 'R',chr(197).chr(149) => 'r',
1211	chr(197).chr(150) => 'R',chr(197).chr(151) => 'r',
1212	chr(197).chr(152) => 'R',chr(197).chr(153) => 'r',
1213	chr(197).chr(154) => 'S',chr(197).chr(155) => 's',
1214	chr(197).chr(156) => 'S',chr(197).chr(157) => 's',
1215	chr(197).chr(158) => 'S',chr(197).chr(159) => 's',
1216	chr(197).chr(160) => 'S', chr(197).chr(161) => 's',
1217	chr(197).chr(162) => 'T', chr(197).chr(163) => 't',
1218	chr(197).chr(164) => 'T', chr(197).chr(165) => 't',
1219	chr(197).chr(166) => 'T', chr(197).chr(167) => 't',
1220	chr(197).chr(168) => 'U', chr(197).chr(169) => 'u',
1221	chr(197).chr(170) => 'U', chr(197).chr(171) => 'u',
1222	chr(197).chr(172) => 'U', chr(197).chr(173) => 'u',
1223	chr(197).chr(174) => 'U', chr(197).chr(175) => 'u',
1224	chr(197).chr(176) => 'U', chr(197).chr(177) => 'u',
1225	chr(197).chr(178) => 'U', chr(197).chr(179) => 'u',
1226	chr(197).chr(180) => 'W', chr(197).chr(181) => 'w',
1227	chr(197).chr(182) => 'Y', chr(197).chr(183) => 'y',
1228	chr(197).chr(184) => 'Y', chr(197).chr(185) => 'Z',
1229	chr(197).chr(186) => 'z', chr(197).chr(187) => 'Z',
1230	chr(197).chr(188) => 'z', chr(197).chr(189) => 'Z',
1231	chr(197).chr(190) => 'z', chr(197).chr(191) => 's',
1232	// Decompositions for Latin Extended-B
1233	chr(200).chr(152) => 'S', chr(200).chr(153) => 's',
1234	chr(200).chr(154) => 'T', chr(200).chr(155) => 't',
1235	// Euro Sign
1236	chr(226).chr(130).chr(172) => 'E',
1237	// GBP (Pound) Sign
1238	chr(194).chr(163) => '',
1239	// Vowels with diacritic (Vietnamese)
1240	// unmarked
1241	chr(198).chr(160) => 'O', chr(198).chr(161) => 'o',
1242	chr(198).chr(175) => 'U', chr(198).chr(176) => 'u',
1243	// grave accent
1244	chr(225).chr(186).chr(166) => 'A', chr(225).chr(186).chr(167) => 'a',
1245	chr(225).chr(186).chr(176) => 'A', chr(225).chr(186).chr(177) => 'a',
1246	chr(225).chr(187).chr(128) => 'E', chr(225).chr(187).chr(129) => 'e',
1247	chr(225).chr(187).chr(146) => 'O', chr(225).chr(187).chr(147) => 'o',
1248	chr(225).chr(187).chr(156) => 'O', chr(225).chr(187).chr(157) => 'o',
1249	chr(225).chr(187).chr(170) => 'U', chr(225).chr(187).chr(171) => 'u',
1250	chr(225).chr(187).chr(178) => 'Y', chr(225).chr(187).chr(179) => 'y',
1251	// hook
1252	chr(225).chr(186).chr(162) => 'A', chr(225).chr(186).chr(163) => 'a',
1253	chr(225).chr(186).chr(168) => 'A', chr(225).chr(186).chr(169) => 'a',
1254	chr(225).chr(186).chr(178) => 'A', chr(225).chr(186).chr(179) => 'a',
1255	chr(225).chr(186).chr(186) => 'E', chr(225).chr(186).chr(187) => 'e',
1256	chr(225).chr(187).chr(130) => 'E', chr(225).chr(187).chr(131) => 'e',
1257	chr(225).chr(187).chr(136) => 'I', chr(225).chr(187).chr(137) => 'i',
1258	chr(225).chr(187).chr(142) => 'O', chr(225).chr(187).chr(143) => 'o',
1259	chr(225).chr(187).chr(148) => 'O', chr(225).chr(187).chr(149) => 'o',
1260	chr(225).chr(187).chr(158) => 'O', chr(225).chr(187).chr(159) => 'o',
1261	chr(225).chr(187).chr(166) => 'U', chr(225).chr(187).chr(167) => 'u',
1262	chr(225).chr(187).chr(172) => 'U', chr(225).chr(187).chr(173) => 'u',
1263	chr(225).chr(187).chr(182) => 'Y', chr(225).chr(187).chr(183) => 'y',
1264	// tilde
1265	chr(225).chr(186).chr(170) => 'A', chr(225).chr(186).chr(171) => 'a',
1266	chr(225).chr(186).chr(180) => 'A', chr(225).chr(186).chr(181) => 'a',
1267	chr(225).chr(186).chr(188) => 'E', chr(225).chr(186).chr(189) => 'e',
1268	chr(225).chr(187).chr(132) => 'E', chr(225).chr(187).chr(133) => 'e',
1269	chr(225).chr(187).chr(150) => 'O', chr(225).chr(187).chr(151) => 'o',
1270	chr(225).chr(187).chr(160) => 'O', chr(225).chr(187).chr(161) => 'o',
1271	chr(225).chr(187).chr(174) => 'U', chr(225).chr(187).chr(175) => 'u',
1272	chr(225).chr(187).chr(184) => 'Y', chr(225).chr(187).chr(185) => 'y',
1273	// acute accent
1274	chr(225).chr(186).chr(164) => 'A', chr(225).chr(186).chr(165) => 'a',
1275	chr(225).chr(186).chr(174) => 'A', chr(225).chr(186).chr(175) => 'a',
1276	chr(225).chr(186).chr(190) => 'E', chr(225).chr(186).chr(191) => 'e',
1277	chr(225).chr(187).chr(144) => 'O', chr(225).chr(187).chr(145) => 'o',
1278	chr(225).chr(187).chr(154) => 'O', chr(225).chr(187).chr(155) => 'o',
1279	chr(225).chr(187).chr(168) => 'U', chr(225).chr(187).chr(169) => 'u',
1280	// dot below
1281	chr(225).chr(186).chr(160) => 'A', chr(225).chr(186).chr(161) => 'a',
1282	chr(225).chr(186).chr(172) => 'A', chr(225).chr(186).chr(173) => 'a',
1283	chr(225).chr(186).chr(182) => 'A', chr(225).chr(186).chr(183) => 'a',
1284	chr(225).chr(186).chr(184) => 'E', chr(225).chr(186).chr(185) => 'e',
1285	chr(225).chr(187).chr(134) => 'E', chr(225).chr(187).chr(135) => 'e',
1286	chr(225).chr(187).chr(138) => 'I', chr(225).chr(187).chr(139) => 'i',
1287	chr(225).chr(187).chr(140) => 'O', chr(225).chr(187).chr(141) => 'o',
1288	chr(225).chr(187).chr(152) => 'O', chr(225).chr(187).chr(153) => 'o',
1289	chr(225).chr(187).chr(162) => 'O', chr(225).chr(187).chr(163) => 'o',
1290	chr(225).chr(187).chr(164) => 'U', chr(225).chr(187).chr(165) => 'u',
1291	chr(225).chr(187).chr(176) => 'U', chr(225).chr(187).chr(177) => 'u',
1292	chr(225).chr(187).chr(180) => 'Y', chr(225).chr(187).chr(181) => 'y',
1293	// Vowels with diacritic (Chinese, Hanyu Pinyin)
1294	chr(201).chr(145) => 'a',
1295	// macron
1296	chr(199).chr(149) => 'U', chr(199).chr(150) => 'u',
1297	// acute accent
1298	chr(199).chr(151) => 'U', chr(199).chr(152) => 'u',
1299	// caron
1300	chr(199).chr(141) => 'A', chr(199).chr(142) => 'a',
1301	chr(199).chr(143) => 'I', chr(199).chr(144) => 'i',
1302	chr(199).chr(145) => 'O', chr(199).chr(146) => 'o',
1303	chr(199).chr(147) => 'U', chr(199).chr(148) => 'u',
1304	chr(199).chr(153) => 'U', chr(199).chr(154) => 'u',
1305	// grave accent
1306	chr(199).chr(155) => 'U', chr(199).chr(156) => 'u',
1307	);
1308
1309	// Used for locale-specific rules
1310	$locale = get_locale();
1311
1312	if ( 'de_DE' == $locale \|\| 'de_DE_formal' == $locale ) {
1313	$chars[ chr(195).chr(132) ] = 'Ae';
1314	$chars[ chr(195).chr(164) ] = 'ae';
1315	$chars[ chr(195).chr(150) ] = 'Oe';
1316	$chars[ chr(195).chr(182) ] = 'oe';
1317	$chars[ chr(195).chr(156) ] = 'Ue';
1318	$chars[ chr(195).chr(188) ] = 'ue';
1319	$chars[ chr(195).chr(159) ] = 'ss';
1320	} elseif ( 'da_DK' === $locale ) {
1321	$chars[ chr(195).chr(134) ] = 'Ae';
1322	$chars[ chr(195).chr(166) ] = 'ae';
1323	$chars[ chr(195).chr(152) ] = 'Oe';
1324	$chars[ chr(195).chr(184) ] = 'oe';
1325	$chars[ chr(195).chr(133) ] = 'Aa';
1326	$chars[ chr(195).chr(165) ] = 'aa';
1327	}
1328
1329	$string = strtr($string, $chars);
1330	} else {
1331	$chars = array();
1332	// Assume ISO-8859-1 if not UTF-8
1333	$chars['in'] = chr(128).chr(131).chr(138).chr(142).chr(154).chr(158)
1334	.chr(159).chr(162).chr(165).chr(181).chr(192).chr(193).chr(194)
1335	.chr(195).chr(196).chr(197).chr(199).chr(200).chr(201).chr(202)
1336	.chr(203).chr(204).chr(205).chr(206).chr(207).chr(209).chr(210)
1337	.chr(211).chr(212).chr(213).chr(214).chr(216).chr(217).chr(218)
1338	.chr(219).chr(220).chr(221).chr(224).chr(225).chr(226).chr(227)
1339	.chr(228).chr(229).chr(231).chr(232).chr(233).chr(234).chr(235)
1340	.chr(236).chr(237).chr(238).chr(239).chr(241).chr(242).chr(243)
1341	.chr(244).chr(245).chr(246).chr(248).chr(249).chr(250).chr(251)
1342	.chr(252).chr(253).chr(255);
1343
1344	$chars['out'] = "EfSZszYcYuAAAAAACEEEEIIIINOOOOOOUUUUYaaaaaaceeeeiiiinoooooouuuuyy";
1345
1346	$string = strtr($string, $chars['in'], $chars['out']);
1347	$double_chars = array();
1348	$double_chars['in'] = array(chr(140), chr(156), chr(198), chr(208), chr(222), chr(223), chr(230), chr(240), chr(254));
1349	$double_chars['out'] = array('OE', 'oe', 'AE', 'DH', 'TH', 'ss', 'ae', 'dh', 'th');
1350	$string = str_replace($double_chars['in'], $double_chars['out'], $string);
1351	}
1352
1353	return $string;
1354	}
1355
1356	/**
1357	* Sanitizes a filename, replacing whitespace with dashes.
1358	*
1359	* Removes special characters that are illegal in filenames on certain
1360	* operating systems and special characters requiring special escaping
1361	* to manipulate at the command line. Replaces spaces and consecutive
1362	* dashes with a single dash. Trims period, dash and underscore from beginning
1363	* and end of filename.
1364	*
1365	* @since 2.1.0
1366	*
1367	* @param string $filename The filename to be sanitized
1368	* @return string The sanitized filename
1369	*/
1370	function sanitize_file_name( $filename ) {
1371	$filename_raw = $filename;
1372	$special_chars = array("?", "[", "]", "/", "\\", "=", "<", ">", ":", ";", ",", "'", "\"", "&", "$", "#", "*", "(", ")", "\|", "~", "`", "!", "{", "}", "%", "+", chr(0));
1373	/**
1374	* Filter the list of characters to remove from a filename.
1375	*
1376	* @since 2.8.0
1377	*
1378	* @param array $special_chars Characters to remove.
1379	* @param string $filename_raw Filename as it was passed into sanitize_file_name().
1380	*/
1381	$special_chars = apply_filters( 'sanitize_file_name_chars', $special_chars, $filename_raw );
1382	$filename = preg_replace( "#\x{00a0}#siu", ' ', $filename );
1383	$filename = str_replace( $special_chars, '', $filename );
1384	$filename = str_replace( array( '%20', '+' ), '-', $filename );
1385	$filename = preg_replace( '/[\r\n\t -]+/', '-', $filename );
1386	$filename = trim( $filename, '.-_' );
1387
1388	// Split the filename into a base and extension[s]
1389	$parts = explode('.', $filename);
1390
1391	// Return if only one extension
1392	if ( count( $parts ) <= 2 ) {
1393	/**
1394	* Filter a sanitized filename string.
1395	*
1396	* @since 2.8.0
1397	*
1398	* @param string $filename Sanitized filename.
1399	* @param string $filename_raw The filename prior to sanitization.
1400	*/
1401	return apply_filters( 'sanitize_file_name', $filename, $filename_raw );
1402	}
1403
1404	// Process multiple extensions
1405	$filename = array_shift($parts);
1406	$extension = array_pop($parts);
1407	$mimes = get_allowed_mime_types();
1408
1409	/*
1410	* Loop over any intermediate extensions. Postfix them with a trailing underscore
1411	* if they are a 2 - 5 character long alpha string not in the extension whitelist.
1412	*/
1413	foreach ( (array) $parts as $part) {
1414	$filename .= '.' . $part;
1415
1416	if ( preg_match("/^[a-zA-Z]{2,5}\d?$/", $part) ) {
1417	$allowed = false;
1418	foreach ( $mimes as $ext_preg => $mime_match ) {
1419	$ext_preg = '!^(' . $ext_preg . ')$!i';
1420	if ( preg_match( $ext_preg, $part ) ) {
1421	$allowed = true;
1422	break;
1423	}
1424	}
1425	if ( !$allowed )
1426	$filename .= '_';
1427	}
1428	}
1429	$filename .= '.' . $extension;
1430	/** This filter is documented in wp-includes/formatting.php */
1431	return apply_filters('sanitize_file_name', $filename, $filename_raw);
1432	}
1433
1434	/**
1435	* Sanitizes a username, stripping out unsafe characters.
1436	*
1437	* Removes tags, octets, entities, and if strict is enabled, will only keep
1438	* alphanumeric, _, space, ., -, @. After sanitizing, it passes the username,
1439	* raw username (the username in the parameter), and the value of $strict as
1440	* parameters for the 'sanitize_user' filter.
1441	*
1442	* @since 2.0.0
1443	*
1444	* @param string $username The username to be sanitized.
1445	* @param bool $strict If set limits $username to specific characters. Default false.
1446	* @return string The sanitized username, after passing through filters.
1447	*/
1448	function sanitize_user( $username, $strict = false ) {
1449	$raw_username = $username;
1450	$username = wp_strip_all_tags( $username );
1451	$username = remove_accents( $username );
1452	// Kill octets
1453	$username = preg_replace( '\|%([a-fA-F0-9][a-fA-F0-9])\|', '', $username );
1454	$username = preg_replace( '/&.+?;/', '', $username ); // Kill entities
1455
1456	// If strict, reduce to ASCII for max portability.
1457	if ( $strict )
1458	$username = preg_replace( '\|[^a-z0-9 _.\-@]\|i', '', $username );
1459
1460	$username = trim( $username );
1461	// Consolidate contiguous whitespace
1462	$username = preg_replace( '\|\s+\|', ' ', $username );
1463
1464	/**
1465	* Filter a sanitized username string.
1466	*
1467	* @since 2.0.1
1468	*
1469	* @param string $username Sanitized username.
1470	* @param string $raw_username The username prior to sanitization.
1471	* @param bool $strict Whether to limit the sanitization to specific characters. Default false.
1472	*/
1473	return apply_filters( 'sanitize_user', $username, $raw_username, $strict );
1474	}
1475
1476	/**
1477	* Sanitizes a string key.
1478	*
1479	* Keys are used as internal identifiers. Lowercase alphanumeric characters, dashes and underscores are allowed.
1480	*
1481	* @since 3.0.0
1482	*
1483	* @param string $key String key
1484	* @return string Sanitized key
1485	*/
1486	function sanitize_key( $key ) {
1487	$raw_key = $key;
1488	$key = strtolower( $key );
1489	$key = preg_replace( '/[^a-z0-9_\-]/', '', $key );
1490
1491	/**
1492	* Filter a sanitized key string.
1493	*
1494	* @since 3.0.0
1495	*
1496	* @param string $key Sanitized key.
1497	* @param string $raw_key The key prior to sanitization.
1498	*/
1499	return apply_filters( 'sanitize_key', $key, $raw_key );
1500	}
1501
1502	/**
1503	* Sanitizes a title, or returns a fallback title.
1504	*
1505	* Specifically, HTML and PHP tags are stripped. Further actions can be added
1506	* via the plugin API. If $title is empty and $fallback_title is set, the latter
1507	* will be used.
1508	*
1509	* @since 1.0.0
1510	*
1511	* @param string $title The string to be sanitized.
1512	* @param string $fallback_title Optional. A title to use if $title is empty.
1513	* @param string $context Optional. The operation for which the string is sanitized
1514	* @return string The sanitized string.
1515	*/
1516	function sanitize_title( $title, $fallback_title = '', $context = 'save' ) {
1517	$raw_title = $title;
1518
1519	if ( 'save' == $context )
1520	$title = remove_accents($title);
1521
1522	/**
1523	* Filter a sanitized title string.
1524	*
1525	* @since 1.2.0
1526	*
1527	* @param string $title Sanitized title.
1528	* @param string $raw_title The title prior to sanitization.
1529	* @param string $context The context for which the title is being sanitized.
1530	*/
1531	$title = apply_filters( 'sanitize_title', $title, $raw_title, $context );
1532
1533	if ( '' === $title \|\| false === $title )
1534	$title = $fallback_title;
1535
1536	return $title;
1537	}
1538
1539	/**
1540	* Sanitizes a title with the 'query' context.
1541	*
1542	* Used for querying the database for a value from URL.
1543	*
1544	* @since 3.1.0
1545	*
1546	* @param string $title The string to be sanitized.
1547	* @return string The sanitized string.
1548	*/
1549	function sanitize_title_for_query( $title ) {
1550	return sanitize_title( $title, '', 'query' );
1551	}
1552
1553	/**
1554	* Sanitizes a title, replacing whitespace and a few other characters with dashes.
1555	*
1556	* Limits the output to alphanumeric characters, underscore (_) and dash (-).
1557	* Whitespace becomes a dash.
1558	*
1559	* @since 1.2.0
1560	*
1561	* @param string $title The title to be sanitized.
1562	* @param string $raw_title Optional. Not used.
1563	* @param string $context Optional. The operation for which the string is sanitized.
1564	* @return string The sanitized title.
1565	*/
1566	function sanitize_title_with_dashes( $title, $raw_title = '', $context = 'display' ) {
1567	$title = strip_tags($title);
1568	// Preserve escaped octets.
1569	$title = preg_replace('\|%([a-fA-F0-9][a-fA-F0-9])\|', '---$1---', $title);
1570	// Remove percent signs that are not part of an octet.
1571	$title = str_replace('%', '', $title);
1572	// Restore octets.
1573	$title = preg_replace('\|---([a-fA-F0-9][a-fA-F0-9])---\|', '%$1', $title);
1574
1575	if (seems_utf8($title)) {
1576	if (function_exists('mb_strtolower')) {
1577	$title = mb_strtolower($title, 'UTF-8');
1578	}
1579	$title = utf8_uri_encode($title, 200);
1580	}
1581
1582	$title = strtolower($title);
1583	$title = preg_replace('/&.+?;/', '', $title); // kill entities
1584	$title = str_replace('.', '-', $title);
1585
1586	if ( 'save' == $context ) {
1587	// Convert nbsp, ndash and mdash to hyphens
1588	$title = str_replace( array( '%c2%a0', '%e2%80%93', '%e2%80%94' ), '-', $title );
1589
1590	// Strip these characters entirely
1591	$title = str_replace( array(
1592	// iexcl and iquest
1593	'%c2%a1', '%c2%bf',
1594	// angle quotes
1595	'%c2%ab', '%c2%bb', '%e2%80%b9', '%e2%80%ba',
1596	// curly quotes
1597	'%e2%80%98', '%e2%80%99', '%e2%80%9c', '%e2%80%9d',
1598	'%e2%80%9a', '%e2%80%9b', '%e2%80%9e', '%e2%80%9f',
1599	// copy, reg, deg, hellip and trade
1600	'%c2%a9', '%c2%ae', '%c2%b0', '%e2%80%a6', '%e2%84%a2',
1601	// acute accents
1602	'%c2%b4', '%cb%8a', '%cc%81', '%cd%81',
1603	// grave accent, macron, caron
1604	'%cc%80', '%cc%84', '%cc%8c',
1605	), '', $title );
1606
1607	// Convert times to x
1608	$title = str_replace( '%c3%97', 'x', $title );
1609	}
1610
1611	$title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
1612	$title = preg_replace('/\s+/', '-', $title);
1613	$title = preg_replace('\|-+\|', '-', $title);
1614	$title = trim($title, '-');
1615
1616	return $title;
1617	}
1618
1619	/**
1620	* Ensures a string is a valid SQL 'order by' clause.
1621	*
1622	* Accepts one or more columns, with or without a sort order (ASC / DESC).
1623	* e.g. 'column_1', 'column_1, column_2', 'column_1 ASC, column_2 DESC' etc.
1624	*
1625	* Also accepts 'RAND()'.
1626	*
1627	* @since 2.5.1
1628	*
1629	* @param string $orderby Order by clause to be validated.
1630	* @return string\|false Returns $orderby if valid, false otherwise.
1631	*/
1632	function sanitize_sql_orderby( $orderby ) {
1633	if ( preg_match( '/^\s(([a-z0-9_]+\|`[a-z0-9_]+`)(\s+(ASC\|DESC))?\s(,\s(?=[a-z0-9_`])\|$))+$/i', $orderby ) \|\| preg_match( '/^\sRAND$\s$\s$/i', $orderby ) ) {
1634	return $orderby;
1635	}
1636	return false;
1637	}
1638
1639	/**
1640	* Sanitizes an HTML classname to ensure it only contains valid characters.
1641	*
1642	* Strips the string down to A-Z,a-z,0-9,_,-. If this results in an empty
1643	* string then it will return the alternative value supplied.
1644	*
1645	* @todo Expand to support the full range of CDATA that a class attribute can contain.
1646	*
1647	* @since 2.8.0
1648	*
1649	* @param string $class The classname to be sanitized
1650	* @param string $fallback Optional. The value to return if the sanitization ends up as an empty string.
1651	* Defaults to an empty string.
1652	* @return string The sanitized value
1653	*/
1654	function sanitize_html_class( $class, $fallback = '' ) {
1655	//Strip out any % encoded octets
1656	$sanitized = preg_replace( '\|%[a-fA-F0-9][a-fA-F0-9]\|', '', $class );
1657
1658	//Limit to A-Z,a-z,0-9,_,-
1659	$sanitized = preg_replace( '/[^A-Za-z0-9_-]/', '', $sanitized );
1660
1661	if ( '' == $sanitized && $fallback ) {
1662	return sanitize_html_class( $fallback );
1663	}
1664	/**
1665	* Filter a sanitized HTML class string.
1666	*
1667	* @since 2.8.0
1668	*
1669	* @param string $sanitized The sanitized HTML class.
1670	* @param string $class HTML class before sanitization.
1671	* @param string $fallback The fallback string.
1672	*/
1673	return apply_filters( 'sanitize_html_class', $sanitized, $class, $fallback );
1674	}
1675
1676	/**
1677	* Converts lone & characters into `&` (a.k.a. `&`)
1678	*
1679	* @since 0.71
1680	*
1681	* @param string $content String of characters to be converted.
1682	* @param string $deprecated Not used.
1683	* @return string Converted string.
1684	*/
1685	function convert_chars( $content, $deprecated = '' ) {
1686	if ( ! empty( $deprecated ) ) {
1687	_deprecated_argument( __FUNCTION__, '0.71' );
1688	}
1689
1690	if ( strpos( $content, '&' ) !== false ) {
1691	$content = preg_replace( '/&([^#])(?![a-z1-4]{1,8};)/i', '&$1', $content );
1692	}
1693
1694	return $content;
1695	}
1696
1697	/**
1698	* Converts invalid Unicode references range to valid range.
1699	*
1700	* @since 4.3.0
1701	*
1702	* @param string $content String with entities that need converting.
1703	* @return string Converted string.
1704	*/
1705	function convert_invalid_entities( $content ) {
1706	$wp_htmltranswinuni = array(
1707	'' => '€', // the Euro sign
1708	'' => '',
1709	'' => '‚', // these are Windows CP1252 specific characters
1710	'' => 'ƒ', // they would look weird on non-Windows browsers
1711	'' => '„',
1712	'' => '…',
1713	'' => '†',
1714	'' => '‡',
1715	'' => 'ˆ',
1716	'' => '‰',
1717	'' => 'Š',
1718	'' => '‹',
1719	'' => 'Œ',
1720	'' => '',
1721	'' => 'Ž',
1722	'' => '',
1723	'' => '',
1724	'' => '‘',
1725	'' => '’',
1726	'' => '“',
1727	'' => '”',
1728	'' => '•',
1729	'' => '–',
1730	'' => '—',
1731	'' => '˜',
1732	'' => '™',
1733	'' => 'š',
1734	'' => '›',
1735	'' => 'œ',
1736	'' => '',
1737	'' => 'ž',
1738	'' => 'Ÿ'
1739	);
1740
1741	if ( strpos( $content, '&#1' ) !== false ) {
1742	$content = strtr( $content, $wp_htmltranswinuni );
1743	}
1744
1745	return $content;
1746	}
1747
1748	/**
1749	* Balances tags if forced to, or if the 'use_balanceTags' option is set to true.
1750	*
1751	* @since 0.71
1752	*
1753	* @param string $text Text to be balanced
1754	* @param bool $force If true, forces balancing, ignoring the value of the option. Default false.
1755	* @return string Balanced text
1756	*/
1757	function balanceTags( $text, $force = false ) {
1758	if ( $force \|\| get_option('use_balanceTags') == 1 ) {
1759	return force_balance_tags( $text );
1760	} else {
1761	return $text;
1762	}
1763	}
1764
1765	/**
1766	* Balances tags of string using a modified stack.
1767	*
1768	* @since 2.0.4
1769	*
1770	* @author Leonard Lin <leonard@acm.org>
1771	* @license GPL
1772	* @copyright November 4, 2001
1773	* @version 1.1
1774	* @todo Make better - change loop condition to $text in 1.2
1775	* @internal Modified by Scott Reilly (coffee2code) 02 Aug 2004
1776	* 1.1 Fixed handling of append/stack pop order of end text
1777	* Added Cleaning Hooks
1778	* 1.0 First Version
1779	*
1780	* @param string $text Text to be balanced.
1781	* @return string Balanced text.
1782	*/
1783	function force_balance_tags( $text ) {
1784	$tagstack = array();
1785	$stacksize = 0;
1786	$tagqueue = '';
1787	$newtext = '';
1788	// Known single-entity/self-closing tags
1789	$single_tags = array( 'area', 'base', 'basefont', 'br', 'col', 'command', 'embed', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param', 'source' );
1790	// Tags that can be immediately nested within themselves
1791	$nestable_tags = array( 'blockquote', 'div', 'object', 'q', 'span' );
1792
1793	// WP bug fix for comments - in case you REALLY meant to type '< !--'
1794	$text = str_replace('< !--', '< !--', $text);
1795	// WP bug fix for LOVE <3 (and other situations with '<' before a number)
1796	$text = preg_replace('#<([0-9]{1})#', '<$1', $text);
1797
1798	while ( preg_match("/<(\/?[\w:])\s([^>]*)>/", $text, $regex) ) {
1799	$newtext .= $tagqueue;
1800
1801	$i = strpos($text, $regex[0]);
1802	$l = strlen($regex[0]);
1803
1804	// clear the shifter
1805	$tagqueue = '';
1806	// Pop or Push
1807	if ( isset($regex[1][0]) && '/' == $regex[1][0] ) { // End Tag
1808	$tag = strtolower(substr($regex[1],1));
1809	// if too many closing tags
1810	if ( $stacksize <= 0 ) {
1811	$tag = '';
1812	// or close to be safe $tag = '/' . $tag;
1813	}
1814	// if stacktop value = tag close value then pop
1815	elseif ( $tagstack[$stacksize - 1] == $tag ) { // found closing tag
1816	$tag = '</' . $tag . '>'; // Close Tag
1817	// Pop
1818	array_pop( $tagstack );
1819	$stacksize--;
1820	} else { // closing tag not at top, search for it
1821	for ( $j = $stacksize-1; $j >= 0; $j-- ) {
1822	if ( $tagstack[$j] == $tag ) {
1823	// add tag to tagqueue
1824	for ( $k = $stacksize-1; $k >= $j; $k--) {
1825	$tagqueue .= '</' . array_pop( $tagstack ) . '>';
1826	$stacksize--;
1827	}
1828	break;
1829	}
1830	}
1831	$tag = '';
1832	}
1833	} else { // Begin Tag
1834	$tag = strtolower($regex[1]);
1835
1836	// Tag Cleaning
1837
1838	// If it's an empty tag "< >", do nothing
1839	if ( '' == $tag ) {
1840	// do nothing
1841	}
1842	// ElseIf it presents itself as a self-closing tag...
1843	elseif ( substr( $regex[2], -1 ) == '/' ) {
1844	// ...but it isn't a known single-entity self-closing tag, then don't let it be treated as such and
1845	// immediately close it with a closing tag (the tag will encapsulate no text as a result)
1846	if ( ! in_array( $tag, $single_tags ) )
1847	$regex[2] = trim( substr( $regex[2], 0, -1 ) ) . "></$tag";
1848	}
1849	// ElseIf it's a known single-entity tag but it doesn't close itself, do so
1850	elseif ( in_array($tag, $single_tags) ) {
1851	$regex[2] .= '/';
1852	}
1853	// Else it's not a single-entity tag
1854	else {
1855	// If the top of the stack is the same as the tag we want to push, close previous tag
1856	if ( $stacksize > 0 && !in_array($tag, $nestable_tags) && $tagstack[$stacksize - 1] == $tag ) {
1857	$tagqueue = '</' . array_pop( $tagstack ) . '>';
1858	$stacksize--;
1859	}
1860	$stacksize = array_push( $tagstack, $tag );
1861	}
1862
1863	// Attributes
1864	$attributes = $regex[2];
1865	if ( ! empty( $attributes ) && $attributes[0] != '>' )
1866	$attributes = ' ' . $attributes;
1867
1868	$tag = '<' . $tag . $attributes . '>';
1869	//If already queuing a close tag, then put this tag on, too
1870	if ( !empty($tagqueue) ) {
1871	$tagqueue .= $tag;
1872	$tag = '';
1873	}
1874	}
1875	$newtext .= substr($text, 0, $i) . $tag;
1876	$text = substr($text, $i + $l);
1877	}
1878
1879	// Clear Tag Queue
1880	$newtext .= $tagqueue;
1881
1882	// Add Remaining text
1883	$newtext .= $text;
1884
1885	// Empty Stack
1886	while( $x = array_pop($tagstack) )
1887	$newtext .= '</' . $x . '>'; // Add remaining tags to close
1888
1889	// WP fix for the bug with HTML comments
1890	$newtext = str_replace("< !--","<!--",$newtext);
1891	$newtext = str_replace("< !--","< !--",$newtext);
1892
1893	return $newtext;
1894	}
1895
1896	/**
1897	* Acts on text which is about to be edited.
1898	*
1899	* The $content is run through esc_textarea(), which uses htmlspecialchars()
1900	* to convert special characters to HTML entities. If $richedit is set to true,
1901	* it is simply a holder for the 'format_to_edit' filter.
1902	*
1903	* @since 0.71
1904	* @since 4.4.0 The `$richedit` parameter was renamed to `$rich_text` for clarity.
1905	*
1906	* @param string $content The text about to be edited.
1907	* @param bool $rich_text Optional. Whether `$content` should be considered rich text,
1908	* in which case it would not be passed through esc_textarea().
1909	* Default false.
1910	* @return string The text after the filter (and possibly htmlspecialchars()) has been run.
1911	*/
1912	function format_to_edit( $content, $rich_text = false ) {
1913	/**
1914	* Filter the text to be formatted for editing.
1915	*
1916	* @since 1.2.0
1917	*
1918	* @param string $content The text, prior to formatting for editing.
1919	*/
1920	$content = apply_filters( 'format_to_edit', $content );
1921	if ( ! $rich_text )
1922	$content = esc_textarea( $content );
1923	return $content;
1924	}
1925
1926	/**
1927	* Add leading zeros when necessary.
1928	*
1929	* If you set the threshold to '4' and the number is '10', then you will get
1930	* back '0010'. If you set the threshold to '4' and the number is '5000', then you
1931	* will get back '5000'.
1932	*
1933	* Uses sprintf to append the amount of zeros based on the $threshold parameter
1934	* and the size of the number. If the number is large enough, then no zeros will
1935	* be appended.
1936	*
1937	* @since 0.71
1938	*
1939	* @param int $number Number to append zeros to if not greater than threshold.
1940	* @param int $threshold Digit places number needs to be to not have zeros added.
1941	* @return string Adds leading zeros to number if needed.
1942	*/
1943	function zeroise( $number, $threshold ) {
1944	return sprintf( '%0' . $threshold . 's', $number );
1945	}
1946
1947	/**
1948	* Adds backslashes before letters and before a number at the start of a string.
1949	*
1950	* @since 0.71
1951	*
1952	* @param string $string Value to which backslashes will be added.
1953	* @return string String with backslashes inserted.
1954	*/
1955	function backslashit( $string ) {
1956	if ( isset( $string[0] ) && $string[0] >= '0' && $string[0] <= '9' )
1957	$string = '\\\\' . $string;
1958	return addcslashes( $string, 'A..Za..z' );
1959	}
1960
1961	/**
1962	* Appends a trailing slash.
1963	*
1964	* Will remove trailing forward and backslashes if it exists already before adding
1965	* a trailing forward slash. This prevents double slashing a string or path.
1966	*
1967	* The primary use of this is for paths and thus should be used for paths. It is
1968	* not restricted to paths and offers no specific path support.
1969	*
1970	* @since 1.2.0
1971	*
1972	* @param string $string What to add the trailing slash to.
1973	* @return string String with trailing slash added.
1974	*/
1975	function trailingslashit( $string ) {
1976	return untrailingslashit( $string ) . '/';
1977	}
1978
1979	/**
1980	* Removes trailing forward slashes and backslashes if they exist.
1981	*
1982	* The primary use of this is for paths and thus should be used for paths. It is
1983	* not restricted to paths and offers no specific path support.
1984	*
1985	* @since 2.2.0
1986	*
1987	* @param string $string What to remove the trailing slashes from.
1988	* @return string String without the trailing slashes.
1989	*/
1990	function untrailingslashit( $string ) {
1991	return rtrim( $string, '/\\' );
1992	}
1993
1994	/**
1995	* Adds slashes to escape strings.
1996	*
1997	* Slashes will first be removed if magic_quotes_gpc is set, see {@link
1998	* http://www.php.net/magic_quotes} for more details.
1999	*
2000	* @since 0.71
2001	*
2002	* @param string $gpc The string returned from HTTP request data.
2003	* @return string Returns a string escaped with slashes.
2004	*/
2005	function addslashes_gpc($gpc) {
2006	if ( get_magic_quotes_gpc() )
2007	$gpc = stripslashes($gpc);
2008
2009	return wp_slash($gpc);
2010	}
2011
2012	/**
2013	* Navigates through an array, object, or scalar, and removes slashes from the values.
2014	*
2015	* @since 2.0.0
2016	*
2017	* @param mixed $value The value to be stripped.
2018	* @return mixed Stripped value.
2019	*/
2020	function stripslashes_deep( $value ) {
2021	return map_deep( $value, 'stripslashes_from_strings_only' );
2022	}
2023
2024	/**
2025	* Callback function for `stripslashes_deep()` which strips slashes from strings.
2026	*
2027	* @since 4.4.0
2028	*
2029	* @param mixed $value The array or string to be stripped.
2030	* @return mixed $value The stripped value.
2031	*/
2032	function stripslashes_from_strings_only( $value ) {
2033	return is_string( $value ) ? stripslashes( $value ) : $value;
2034	}
2035
2036	/**
2037	* Navigates through an array, object, or scalar, and encodes the values to be used in a URL.
2038	*
2039	* @since 2.2.0
2040	*
2041	* @param mixed $value The array or string to be encoded.
2042	* @return mixed $value The encoded value.
2043	*/
2044	function urlencode_deep( $value ) {
2045	return map_deep( $value, 'urlencode' );
2046	}
2047
2048	/**
2049	* Navigates through an array, object, or scalar, and raw-encodes the values to be used in a URL.
2050	*
2051	* @since 3.4.0
2052	*
2053	* @param mixed $value The array or string to be encoded.
2054	* @return mixed $value The encoded value.
2055	*/
2056	function rawurlencode_deep( $value ) {
2057	return map_deep( $value, 'rawurlencode' );
2058	}
2059
2060	/**
2061	* Navigates through an array, object, or scalar, and decodes URL-encoded values
2062	*
2063	* @since 4.4.0
2064	*
2065	* @param mixed $value The array or string to be decoded.
2066	* @return mixed $value The decoded value.
2067	*/
2068	function urldecode_deep( $value ) {
2069	return map_deep( $value, 'urldecode' );
2070	}
2071
2072	/**
2073	* Converts email addresses characters to HTML entities to block spam bots.
2074	*
2075	* @since 0.71
2076	*
2077	* @param string $email_address Email address.
2078	* @param int $hex_encoding Optional. Set to 1 to enable hex encoding.
2079	* @return string Converted email address.
2080	*/
2081	function antispambot( $email_address, $hex_encoding = 0 ) {
2082	$email_no_spam_address = '';
2083	for ( $i = 0, $len = strlen( $email_address ); $i < $len; $i++ ) {
2084	$j = rand( 0, 1 + $hex_encoding );
2085	if ( $j == 0 ) {
2086	$email_no_spam_address .= '&#' . ord( $email_address[$i] ) . ';';
2087	} elseif ( $j == 1 ) {
2088	$email_no_spam_address .= $email_address[$i];
2089	} elseif ( $j == 2 ) {
2090	$email_no_spam_address .= '%' . zeroise( dechex( ord( $email_address[$i] ) ), 2 );
2091	}
2092	}
2093
2094	return str_replace( '@', '@', $email_no_spam_address );
2095	}
2096
2097	/**
2098	* Callback to convert URI match to HTML A element.
2099	*
2100	* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
2101	* make_clickable()}.
2102	*
2103	* @since 2.3.2
2104	* @access private
2105	*
2106	* @param array $matches Single Regex Match.
2107	* @return string HTML A element with URI address.
2108	*/
2109	function _make_url_clickable_cb( $matches ) {
2110	$url = $matches[2];
2111
2112	if ( ')' == $matches[3] && strpos( $url, '(' ) ) {
2113	// If the trailing character is a closing parethesis, and the URL has an opening parenthesis in it, add the closing parenthesis to the URL.
2114	// Then we can let the parenthesis balancer do its thing below.
2115	$url .= $matches[3];
2116	$suffix = '';
2117	} else {
2118	$suffix = $matches[3];
2119	}
2120
2121	// Include parentheses in the URL only if paired
2122	while ( substr_count( $url, '(' ) < substr_count( $url, ')' ) ) {
2123	$suffix = strrchr( $url, ')' ) . $suffix;
2124	$url = substr( $url, 0, strrpos( $url, ')' ) );
2125	}
2126
2127	$url = esc_url($url);
2128	if ( empty($url) )
2129	return $matches[0];
2130
2131	return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $suffix;
2132	}
2133
2134	/**
2135	* Callback to convert URL match to HTML A element.
2136	*
2137	* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
2138	* make_clickable()}.
2139	*
2140	* @since 2.3.2
2141	* @access private
2142	*
2143	* @param array $matches Single Regex Match.
2144	* @return string HTML A element with URL address.
2145	*/
2146	function _make_web_ftp_clickable_cb( $matches ) {
2147	$ret = '';
2148	$dest = $matches[2];
2149	$dest = 'http://' . $dest;
2150
2151	// removed trailing [.,;:)] from URL
2152	if ( in_array( substr($dest, -1), array('.', ',', ';', ':', ')') ) === true ) {
2153	$ret = substr($dest, -1);
2154	$dest = substr($dest, 0, strlen($dest)-1);
2155	}
2156
2157	$dest = esc_url($dest);
2158	if ( empty($dest) )
2159	return $matches[0];
2160
2161	return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>$ret";
2162	}
2163
2164	/**
2165	* Callback to convert email address match to HTML A element.
2166	*
2167	* This function was backported from 2.5.0 to 2.3.2. Regex callback for {@link
2168	* make_clickable()}.
2169	*
2170	* @since 2.3.2
2171	* @access private
2172	*
2173	* @param array $matches Single Regex Match.
2174	* @return string HTML A element with email address.
2175	*/
2176	function _make_email_clickable_cb( $matches ) {
2177	$email = $matches[2] . '@' . $matches[3];
2178	return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
2179	}
2180
2181	/**
2182	* Convert plaintext URI to HTML links.
2183	*
2184	* Converts URI, www and ftp, and email addresses. Finishes by fixing links
2185	* within links.
2186	*
2187	* @since 0.71
2188	*
2189	* @param string $text Content to convert URIs.
2190	* @return string Content with converted URIs.
2191	*/
2192	function make_clickable( $text ) {
2193	$r = '';
2194	$textarr = preg_split( '/(<[^<>]+>)/', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // split out HTML tags
2195	$nested_code_pre = 0; // Keep track of how many levels link is nested inside <pre> or <code>
2196	foreach ( $textarr as $piece ) {
2197
2198	if ( preg_match( '\|^<code[\s>]\|i', $piece ) \|\| preg_match( '\|^<pre[\s>]\|i', $piece ) )
2199	$nested_code_pre++;
2200	elseif ( ( '</code>' === strtolower( $piece ) \|\| '</pre>' === strtolower( $piece ) ) && $nested_code_pre )
2201	$nested_code_pre--;
2202
2203	if ( $nested_code_pre \|\| empty( $piece ) \|\| ( $piece[0] === '<' && ! preg_match( '\|^<\s*[\w]{1,20}+://\|', $piece ) ) ) {
2204	$r .= $piece;
2205	continue;
2206	}
2207
2208	// Long strings might contain expensive edge cases ...
2209	if ( 10000 < strlen( $piece ) ) {
2210	// ... break it up
2211	foreach ( _split_str_by_whitespace( $piece, 2100 ) as $chunk ) { // 2100: Extra room for scheme and leading and trailing paretheses
2212	if ( 2101 < strlen( $chunk ) ) {
2213	$r .= $chunk; // Too big, no whitespace: bail.
2214	} else {
2215	$r .= make_clickable( $chunk );
2216	}
2217	}
2218	} else {
2219	$ret = " $piece "; // Pad with whitespace to simplify the regexes
2220
2221	$url_clickable = '~
2222	([\\s(<.,;:!?]) # 1: Leading whitespace, or punctuation
2223	( # 2: URL
2224	[\\w]{1,20}+:// # Scheme and hier-part prefix
2225	(?=\S{1,2000}\s) # Limit to URLs less than about 2000 characters long
2226	[\\w\\x80-\\xff#%\\~/@\\[\\](+=&$-]+ # Non-punctuation URL character
2227	(?: # Unroll the Loop: Only allow puctuation URL character if followed by a non-punctuation URL character
2228	[\'.,;:!?)] # Punctuation URL character
2229	[\\w\\x80-\\xff#%\\~/@\\[\\]*(+=&$-]++ # Non-punctuation URL character
2230	)*
2231	)
2232	(\)?) # 3: Trailing closing parenthesis (for parethesis balancing post processing)
2233	~xS'; // The regex is a non-anchored pattern and does not have a single fixed starting character.
2234	// Tell PCRE to spend more time optimizing since, when used on a page load, it will probably be used several times.
2235
2236	$ret = preg_replace_callback( $url_clickable, '_make_url_clickable_cb', $ret );
2237
2238	$ret = preg_replace_callback( '#([\s>])((www\|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]+)#is', '_make_web_ftp_clickable_cb', $ret );
2239	$ret = preg_replace_callback( '#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret );
2240
2241	$ret = substr( $ret, 1, -1 ); // Remove our whitespace padding.
2242	$r .= $ret;
2243	}
2244	}
2245
2246	// Cleanup of accidental links within links
2247	return preg_replace( '#(<a([ \r\n\t]+[^>]+?>\|>))<a [^>]+?>([^>]+?)</a></a>#i', "$1$3</a>", $r );
2248	}
2249
2250	/**
2251	* Breaks a string into chunks by splitting at whitespace characters.
2252	* The length of each returned chunk is as close to the specified length goal as possible,
2253	* with the caveat that each chunk includes its trailing delimiter.
2254	* Chunks longer than the goal are guaranteed to not have any inner whitespace.
2255	*
2256	* Joining the returned chunks with empty delimiters reconstructs the input string losslessly.
2257	*
2258	* Input string must have no null characters (or eventual transformations on output chunks must not care about null characters)
2259	*
2260	* _split_str_by_whitespace( "1234 67890 1234 67890a cd 1234 890 123456789 1234567890a 45678 1 3 5 7 90 ", 10 ) ==
2261	* array (
2262	* 0 => '1234 67890 ', // 11 characters: Perfect split
2263	* 1 => '1234 ', // 5 characters: '1234 67890a' was too long
2264	* 2 => '67890a cd ', // 10 characters: '67890a cd 1234' was too long
2265	* 3 => '1234 890 ', // 11 characters: Perfect split
2266	* 4 => '123456789 ', // 10 characters: '123456789 1234567890a' was too long
2267	* 5 => '1234567890a ', // 12 characters: Too long, but no inner whitespace on which to split
2268	* 6 => ' 45678 ', // 11 characters: Perfect split
2269	* 7 => '1 3 5 7 90 ', // 11 characters: End of $string
2270	* );
2271	*
2272	* @since 3.4.0
2273	* @access private
2274	*
2275	* @param string $string The string to split.
2276	* @param int $goal The desired chunk length.
2277	* @return array Numeric array of chunks.
2278	*/
2279	function _split_str_by_whitespace( $string, $goal ) {
2280	$chunks = array();
2281
2282	$string_nullspace = strtr( $string, "\r\n\t\v\f ", "\000\000\000\000\000\000" );
2283
2284	while ( $goal < strlen( $string_nullspace ) ) {
2285	$pos = strrpos( substr( $string_nullspace, 0, $goal + 1 ), "\000" );
2286
2287	if ( false === $pos ) {
2288	$pos = strpos( $string_nullspace, "\000", $goal + 1 );
2289	if ( false === $pos ) {
2290	break;
2291	}
2292	}
2293
2294	$chunks[] = substr( $string, 0, $pos + 1 );
2295	$string = substr( $string, $pos + 1 );
2296	$string_nullspace = substr( $string_nullspace, $pos + 1 );
2297	}
2298
2299	if ( $string ) {
2300	$chunks[] = $string;
2301	}
2302
2303	return $chunks;
2304	}
2305
2306	/**
2307	* Adds rel nofollow string to all HTML A elements in content.
2308	*
2309	* @since 1.5.0
2310	*
2311	* @param string $text Content that may contain HTML A elements.
2312	* @return string Converted content.
2313	*/
2314	function wp_rel_nofollow( $text ) {
2315	// This is a pre save filter, so text is already escaped.
2316	$text = stripslashes($text);
2317	$text = preg_replace_callback('\|<a (.+?)>\|i', 'wp_rel_nofollow_callback', $text);
2318	return wp_slash( $text );
2319	}
2320
2321	/**
2322	* Callback to add rel=nofollow string to HTML A element.
2323	*
2324	* Will remove already existing rel="nofollow" and rel='nofollow' from the
2325	* string to prevent from invalidating (X)HTML.
2326	*
2327	* @since 2.3.0
2328	*
2329	* @param array $matches Single Match
2330	* @return string HTML A Element with rel nofollow.
2331	*/
2332	function wp_rel_nofollow_callback( $matches ) {
2333	$text = $matches[1];
2334	$atts = shortcode_parse_atts( $matches[1] );
2335	$rel = 'nofollow';
2336	if ( ! empty( $atts['rel'] ) ) {
2337	$parts = array_map( 'trim', explode( ' ', $atts['rel'] ) );
2338	if ( false === array_search( 'nofollow', $parts ) ) {
2339	$parts[] = 'nofollow';
2340	}
2341	$rel = implode( ' ', $parts );
2342	unset( $atts['rel'] );
2343
2344	$html = '';
2345	foreach ( $atts as $name => $value ) {
2346	$html .= "{$name}=\"$value\" ";
2347	}
2348	$text = trim( $html );
2349	}
2350	return "<a $text rel=\"$rel\">";
2351	}
2352
2353	/**
2354	* Convert one smiley code to the icon graphic file equivalent.
2355	*
2356	* Callback handler for {@link convert_smilies()}.
2357	* Looks up one smiley code in the $wpsmiliestrans global array and returns an
2358	* `<img>` string for that smiley.
2359	*
2360	* @since 2.8.0
2361	*
2362	* @global array $wpsmiliestrans
2363	*
2364	* @param array $matches Single match. Smiley code to convert to image.
2365	* @return string Image string for smiley.
2366	*/
2367	function translate_smiley( $matches ) {
2368	global $wpsmiliestrans;
2369
2370	if ( count( $matches ) == 0 )
2371	return '';
2372
2373	$smiley = trim( reset( $matches ) );
2374	$img = $wpsmiliestrans[ $smiley ];
2375
2376	$matches = array();
2377	$ext = preg_match( '/\.([^.]+)$/', $img, $matches ) ? strtolower( $matches[1] ) : false;
2378	$image_exts = array( 'jpg', 'jpeg', 'jpe', 'gif', 'png' );
2379
2380	// Don't convert smilies that aren't images - they're probably emoji.
2381	if ( ! in_array( $ext, $image_exts ) ) {
2382	return $img;
2383	}
2384
2385	/**
2386	* Filter the Smiley image URL before it's used in the image element.
2387	*
2388	* @since 2.9.0
2389	*
2390	* @param string $smiley_url URL for the smiley image.
2391	* @param string $img Filename for the smiley image.
2392	* @param string $site_url Site URL, as returned by site_url().
2393	*/
2394	$src_url = apply_filters( 'smilies_src', includes_url( "images/smilies/$img" ), $img, site_url() );
2395
2396	return sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', esc_url( $src_url ), esc_attr( $smiley ) );
2397	}
2398
2399	/**
2400	* Convert text equivalent of smilies to images.
2401	*
2402	* Will only convert smilies if the option 'use_smilies' is true and the global
2403	* used in the function isn't empty.
2404	*
2405	* @since 0.71
2406	*
2407	* @global string\|array $wp_smiliessearch
2408	*
2409	* @param string $text Content to convert smilies from text.
2410	* @return string Converted content with text smilies replaced with images.
2411	*/
2412	function convert_smilies( $text ) {
2413	global $wp_smiliessearch;
2414	$output = '';
2415	if ( get_option( 'use_smilies' ) && ! empty( $wp_smiliessearch ) ) {
2416	// HTML loop taken from texturize function, could possible be consolidated
2417	$textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE ); // capture the tags as well as in between
2418	$stop = count( $textarr );// loop stuff
2419
2420	// Ignore proessing of specific tags
2421	$tags_to_ignore = 'code\|pre\|style\|script\|textarea';
2422	$ignore_block_element = '';
2423
2424	for ( $i = 0; $i < $stop; $i++ ) {
2425	$content = $textarr[$i];
2426
2427	// If we're in an ignore block, wait until we find its closing tag
2428	if ( '' == $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')>/', $content, $matches ) ) {
2429	$ignore_block_element = $matches[1];
2430	}
2431
2432	// If it's not a tag and not in ignore block
2433	if ( '' == $ignore_block_element && strlen( $content ) > 0 && '<' != $content[0] ) {
2434	$content = preg_replace_callback( $wp_smiliessearch, 'translate_smiley', $content );
2435	}
2436
2437	// did we exit ignore block
2438	if ( '' != $ignore_block_element && '</' . $ignore_block_element . '>' == $content ) {
2439	$ignore_block_element = '';
2440	}
2441
2442	$output .= $content;
2443	}
2444	} else {
2445	// return default text.
2446	$output = $text;
2447	}
2448	return $output;
2449	}
2450
2451	/**
2452	* Verifies that an email is valid.
2453	*
2454	* Does not grok i18n domains. Not RFC compliant.
2455	*
2456	* @since 0.71
2457	*
2458	* @param string $email Email address to verify.
2459	* @param bool $deprecated Deprecated.
2460	* @return string\|bool Either false or the valid email address.
2461	*/
2462	function is_email( $email, $deprecated = false ) {
2463	$email=trim($email);
2464	if ( ! empty( $deprecated ) )
2465	_deprecated_argument( __FUNCTION__, '3.0' );
2466
2467	// Test for the minimum length the email can be
2468	if ( strlen( $email ) < 3 ) {
2469	/**
2470	* Filter whether an email address is valid.
2471	*
2472	* This filter is evaluated under several different contexts, such as 'email_too_short',
2473	* 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
2474	* 'domain_no_periods', 'sub_hyphen_limits', 'sub_invalid_chars', or no specific context.
2475	*
2476	* @since 2.8.0
2477	*
2478	* @param bool $is_email Whether the email address has passed the is_email() checks. Default false.
2479	* @param string $email The email address being checked.
2480	* @param string $context Context under which the email was tested.
2481	*/
2482	return apply_filters( 'is_email', false, $email, 'email_too_short' );
2483	}
2484
2485	// Test for an @ character after the first position
2486	if ( strpos( $email, '@', 1 ) === false ) {
2487	/** This filter is documented in wp-includes/formatting.php */
2488	return apply_filters( 'is_email', false, $email, 'email_no_at' );
2489	}
2490
2491	// Split out the local and domain parts
2492	list( $local, $domain ) = explode( '@', $email, 2 );
2493
2494	// LOCAL PART
2495	// Test for invalid characters
2496	if ( !preg_match( '/^[a-zA-Z0-9!#$%&\'*+\/=?^_`{\|}~\.-]+$/', $local ) ) {
2497	/** This filter is documented in wp-includes/formatting.php */
2498	return apply_filters( 'is_email', false, $email, 'local_invalid_chars' );
2499	}
2500
2501	// DOMAIN PART
2502	// Test for sequences of periods
2503	if ( preg_match( '/\.{2,}/', $domain ) ) {
2504	/** This filter is documented in wp-includes/formatting.php */
2505	return apply_filters( 'is_email', false, $email, 'domain_period_sequence' );
2506	}
2507
2508	// Test for leading and trailing periods and whitespace
2509	if ( trim( $domain, " \t\n\r\0\x0B." ) !== $domain ) {
2510	/** This filter is documented in wp-includes/formatting.php */
2511	return apply_filters( 'is_email', false, $email, 'domain_period_limits' );
2512	}
2513
2514	// Split the domain into subs
2515	$subs = explode( '.', $domain );
2516
2517	// Assume the domain will have at least two subs
2518	if ( 2 > count( $subs ) ) {
2519	/** This filter is documented in wp-includes/formatting.php */
2520	return apply_filters( 'is_email', false, $email, 'domain_no_periods' );
2521	}
2522
2523	// Loop through each sub
2524	foreach ( $subs as $sub ) {
2525	// Test for leading and trailing hyphens and whitespace
2526	if ( trim( $sub, " \t\n\r\0\x0B-" ) !== $sub ) {
2527	/** This filter is documented in wp-includes/formatting.php */
2528	return apply_filters( 'is_email', false, $email, 'sub_hyphen_limits' );
2529	}
2530
2531	// Test for invalid characters
2532	if ( !preg_match('/^[a-z0-9-]+$/i', $sub ) ) {
2533	/** This filter is documented in wp-includes/formatting.php */
2534	return apply_filters( 'is_email', false, $email, 'sub_invalid_chars' );
2535	}
2536	}
2537
2538	// Congratulations your email made it!
2539	/** This filter is documented in wp-includes/formatting.php */
2540	return apply_filters( 'is_email', $email, $email, null );
2541	}
2542
2543	/**
2544	* Convert to ASCII from email subjects.
2545	*
2546	* @since 1.2.0
2547	*
2548	* @param string $string Subject line
2549	* @return string Converted string to ASCII
2550	*/
2551	function wp_iso_descrambler( $string ) {
2552	/* this may only work with iso-8859-1, I'm afraid */
2553	if (!preg_match('#\=\?(.+)\?Q\?(.+)\?\=#i', $string, $matches)) {
2554	return $string;
2555	} else {
2556	$subject = str_replace('_', ' ', $matches[2]);
2557	return preg_replace_callback( '#\=([0-9a-f]{2})#i', '_wp_iso_convert', $subject );
2558	}
2559	}
2560
2561	/**
2562	* Helper function to convert hex encoded chars to ASCII
2563	*
2564	* @since 3.1.0
2565	* @access private
2566	*
2567	* @param array $match The preg_replace_callback matches array
2568	* @return string Converted chars
2569	*/
2570	function _wp_iso_convert( $match ) {
2571	return chr( hexdec( strtolower( $match[1] ) ) );
2572	}
2573
2574	/**
2575	* Returns a date in the GMT equivalent.
2576	*
2577	* Requires and returns a date in the Y-m-d H:i:s format. If there is a
2578	* timezone_string available, the date is assumed to be in that timezone,
2579	* otherwise it simply subtracts the value of the 'gmt_offset' option. Return
2580	* format can be overridden using the $format parameter.
2581	*
2582	* @since 1.2.0
2583	*
2584	* @param string $string The date to be converted.
2585	* @param string $format The format string for the returned date (default is Y-m-d H:i:s)
2586	* @return string GMT version of the date provided.
2587	*/
2588	function get_gmt_from_date( $string, $format = 'Y-m-d H:i:s' ) {
2589	$tz = get_option( 'timezone_string' );
2590	if ( $tz ) {
2591	$datetime = date_create( $string, new DateTimeZone( $tz ) );
2592	if ( ! $datetime ) {
2593	return gmdate( $format, 0 );
2594	}
2595	$datetime->setTimezone( new DateTimeZone( 'UTC' ) );
2596	$string_gmt = $datetime->format( $format );
2597	} else {
2598	if ( ! preg_match( '#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches ) ) {
2599	$datetime = strtotime( $string );
2600	if ( false === $datetime ) {
2601	return gmdate( $format, 0 );
2602	}
2603	return gmdate( $format, $datetime );
2604	}
2605	$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
2606	$string_gmt = gmdate( $format, $string_time - get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
2607	}
2608	return $string_gmt;
2609	}
2610
2611	/**
2612	* Converts a GMT date into the correct format for the blog.
2613	*
2614	* Requires and returns a date in the Y-m-d H:i:s format. If there is a
2615	* timezone_string available, the returned date is in that timezone, otherwise
2616	* it simply adds the value of gmt_offset. Return format can be overridden
2617	* using the $format parameter
2618	*
2619	* @since 1.2.0
2620	*
2621	* @param string $string The date to be converted.
2622	* @param string $format The format string for the returned date (default is Y-m-d H:i:s)
2623	* @return string Formatted date relative to the timezone / GMT offset.
2624	*/
2625	function get_date_from_gmt( $string, $format = 'Y-m-d H:i:s' ) {
2626	$tz = get_option( 'timezone_string' );
2627	if ( $tz ) {
2628	$datetime = date_create( $string, new DateTimeZone( 'UTC' ) );
2629	if ( ! $datetime )
2630	return date( $format, 0 );
2631	$datetime->setTimezone( new DateTimeZone( $tz ) );
2632	$string_localtime = $datetime->format( $format );
2633	} else {
2634	if ( ! preg_match('#([0-9]{1,4})-([0-9]{1,2})-([0-9]{1,2}) ([0-9]{1,2}):([0-9]{1,2}):([0-9]{1,2})#', $string, $matches) )
2635	return date( $format, 0 );
2636	$string_time = gmmktime( $matches[4], $matches[5], $matches[6], $matches[2], $matches[3], $matches[1] );
2637	$string_localtime = gmdate( $format, $string_time + get_option( 'gmt_offset' ) * HOUR_IN_SECONDS );
2638	}
2639	return $string_localtime;
2640	}
2641
2642	/**
2643	* Computes an offset in seconds from an iso8601 timezone.
2644	*
2645	* @since 1.5.0
2646	*
2647	* @param string $timezone Either 'Z' for 0 offset or '±hhmm'.
2648	* @return int\|float The offset in seconds.
2649	*/
2650	function iso8601_timezone_to_offset( $timezone ) {
2651	// $timezone is either 'Z' or '[+\|-]hhmm'
2652	if ($timezone == 'Z') {
2653	$offset = 0;
2654	} else {
2655	$sign = (substr($timezone, 0, 1) == '+') ? 1 : -1;
2656	$hours = intval(substr($timezone, 1, 2));
2657	$minutes = intval(substr($timezone, 3, 4)) / 60;
2658	$offset = $sign * HOUR_IN_SECONDS * ($hours + $minutes);
2659	}
2660	return $offset;
2661	}
2662
2663	/**
2664	* Converts an iso8601 date to MySQL DateTime format used by post_date[_gmt].
2665	*
2666	* @since 1.5.0
2667	*
2668	* @param string $date_string Date and time in ISO 8601 format {@link http://en.wikipedia.org/wiki/ISO_8601}.
2669	* @param string $timezone Optional. If set to GMT returns the time minus gmt_offset. Default is 'user'.
2670	* @return string The date and time in MySQL DateTime format - Y-m-d H:i:s.
2671	*/
2672	function iso8601_to_datetime( $date_string, $timezone = 'user' ) {
2673	$timezone = strtolower($timezone);
2674
2675	if ($timezone == 'gmt') {
2676
2677	preg_match('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z\|[\+\|\-][0-9]{2,4}){0,1}#', $date_string, $date_bits);
2678
2679	if (!empty($date_bits[7])) { // we have a timezone, so let's compute an offset
2680	$offset = iso8601_timezone_to_offset($date_bits[7]);
2681	} else { // we don't have a timezone, so we assume user local timezone (not server's!)
2682	$offset = HOUR_IN_SECONDS * get_option('gmt_offset');
2683	}
2684
2685	$timestamp = gmmktime($date_bits[4], $date_bits[5], $date_bits[6], $date_bits[2], $date_bits[3], $date_bits[1]);
2686	$timestamp -= $offset;
2687
2688	return gmdate('Y-m-d H:i:s', $timestamp);
2689
2690	} elseif ($timezone == 'user') {
2691	return preg_replace('#([0-9]{4})([0-9]{2})([0-9]{2})T([0-9]{2}):([0-9]{2}):([0-9]{2})(Z\|[\+\|\-][0-9]{2,4}){0,1}#', '$1-$2-$3 $4:$5:$6', $date_string);
2692	}
2693	}
2694
2695	/**
2696	* Adds a element attributes to open links in new windows.
2697	*
2698	* Comment text in popup windows should be filtered through this. Right now it's
2699	* a moderately dumb function, ideally it would detect whether a target or rel
2700	* attribute was already there and adjust its actions accordingly.
2701	*
2702	* @since 0.71
2703	*
2704	* @param string $text Content to replace links to open in a new window.
2705	* @return string Content that has filtered links.
2706	*/
2707	function popuplinks( $text ) {
2708	$text = preg_replace('/<a (.+?)>/i', "<a $1 target='_blank' rel='external'>", $text);
2709	return $text;
2710	}
2711
2712	/**
2713	* Strips out all characters that are not allowable in an email.
2714	*
2715	* @since 1.5.0
2716	*
2717	* @param string $email Email address to filter.
2718	* @return string Filtered email address.
2719	*/
2720	function sanitize_email( $email ) {
2721	// Test for the minimum length the email can be
2722	if ( strlen( $email ) < 3 ) {
2723	/**
2724	* Filter a sanitized email address.
2725	*
2726	* This filter is evaluated under several contexts, including 'email_too_short',
2727	* 'email_no_at', 'local_invalid_chars', 'domain_period_sequence', 'domain_period_limits',
2728	* 'domain_no_periods', 'domain_no_valid_subs', or no context.
2729	*
2730	* @since 2.8.0
2731	*
2732	* @param string $email The sanitized email address.
2733	* @param string $email The email address, as provided to sanitize_email().
2734	* @param string $message A message to pass to the user.
2735	*/
2736	return apply_filters( 'sanitize_email', '', $email, 'email_too_short' );
2737	}
2738
2739	// Test for an @ character after the first position
2740	if ( strpos( $email, '@', 1 ) === false ) {
2741	/** This filter is documented in wp-includes/formatting.php */
2742	return apply_filters( 'sanitize_email', '', $email, 'email_no_at' );
2743	}
2744
2745	// Split out the local and domain parts
2746	list( $local, $domain ) = explode( '@', $email, 2 );
2747
2748	// LOCAL PART
2749	// Test for invalid characters
2750	$local = preg_replace( '/[^a-zA-Z0-9!#$%&\'*+\/=?^_`{\|}~\.-]/', '', $local );
2751	if ( '' === $local ) {
2752	/** This filter is documented in wp-includes/formatting.php */
2753	return apply_filters( 'sanitize_email', '', $email, 'local_invalid_chars' );
2754	}
2755
2756	// DOMAIN PART
2757	// Test for sequences of periods
2758	$domain = preg_replace( '/\.{2,}/', '', $domain );
2759	if ( '' === $domain ) {
2760	/** This filter is documented in wp-includes/formatting.php */
2761	return apply_filters( 'sanitize_email', '', $email, 'domain_period_sequence' );
2762	}
2763
2764	// Test for leading and trailing periods and whitespace
2765	$domain = trim( $domain, " \t\n\r\0\x0B." );
2766	if ( '' === $domain ) {
2767	/** This filter is documented in wp-includes/formatting.php */
2768	return apply_filters( 'sanitize_email', '', $email, 'domain_period_limits' );
2769	}
2770
2771	// Split the domain into subs
2772	$subs = explode( '.', $domain );
2773
2774	// Assume the domain will have at least two subs
2775	if ( 2 > count( $subs ) ) {
2776	/** This filter is documented in wp-includes/formatting.php */
2777	return apply_filters( 'sanitize_email', '', $email, 'domain_no_periods' );
2778	}
2779
2780	// Create an array that will contain valid subs
2781	$new_subs = array();
2782
2783	// Loop through each sub
2784	foreach ( $subs as $sub ) {
2785	// Test for leading and trailing hyphens
2786	$sub = trim( $sub, " \t\n\r\0\x0B-" );
2787
2788	// Test for invalid characters
2789	$sub = preg_replace( '/[^a-z0-9-]+/i', '', $sub );
2790
2791	// If there's anything left, add it to the valid subs
2792	if ( '' !== $sub ) {
2793	$new_subs[] = $sub;
2794	}
2795	}
2796
2797	// If there aren't 2 or more valid subs
2798	if ( 2 > count( $new_subs ) ) {
2799	/** This filter is documented in wp-includes/formatting.php */
2800	return apply_filters( 'sanitize_email', '', $email, 'domain_no_valid_subs' );
2801	}
2802
2803	// Join valid subs into the new domain
2804	$domain = join( '.', $new_subs );
2805
2806	// Put the email back together
2807	$email = $local . '@' . $domain;
2808
2809	// Congratulations your email made it!
2810	/** This filter is documented in wp-includes/formatting.php */
2811	return apply_filters( 'sanitize_email', $email, $email, null );
2812	}
2813
2814	/**
2815	* Determines the difference between two timestamps.
2816	*
2817	* The difference is returned in a human readable format such as "1 hour",
2818	* "5 mins", "2 days".
2819	*
2820	* @since 1.5.0
2821	*
2822	* @param int $from Unix timestamp from which the difference begins.
2823	* @param int $to Optional. Unix timestamp to end the time difference. Default becomes time() if not set.
2824	* @return string Human readable time difference.
2825	*/
2826	function human_time_diff( $from, $to = '' ) {
2827	if ( empty( $to ) ) {
2828	$to = time();
2829	}
2830
2831	$diff = (int) abs( $to - $from );
2832
2833	if ( $diff < HOUR_IN_SECONDS ) {
2834	$mins = round( $diff / MINUTE_IN_SECONDS );
2835	if ( $mins <= 1 )
2836	$mins = 1;
2837	/* translators: min=minute */
2838	$since = sprintf( _n( '%s min', '%s mins', $mins ), $mins );
2839	} elseif ( $diff < DAY_IN_SECONDS && $diff >= HOUR_IN_SECONDS ) {
2840	$hours = round( $diff / HOUR_IN_SECONDS );
2841	if ( $hours <= 1 )
2842	$hours = 1;
2843	$since = sprintf( _n( '%s hour', '%s hours', $hours ), $hours );
2844	} elseif ( $diff < WEEK_IN_SECONDS && $diff >= DAY_IN_SECONDS ) {
2845	$days = round( $diff / DAY_IN_SECONDS );
2846	if ( $days <= 1 )
2847	$days = 1;
2848	$since = sprintf( _n( '%s day', '%s days', $days ), $days );
2849	} elseif ( $diff < MONTH_IN_SECONDS && $diff >= WEEK_IN_SECONDS ) {
2850	$weeks = round( $diff / WEEK_IN_SECONDS );
2851	if ( $weeks <= 1 )
2852	$weeks = 1;
2853	$since = sprintf( _n( '%s week', '%s weeks', $weeks ), $weeks );
2854	} elseif ( $diff < YEAR_IN_SECONDS && $diff >= MONTH_IN_SECONDS ) {
2855	$months = round( $diff / MONTH_IN_SECONDS );
2856	if ( $months <= 1 )
2857	$months = 1;
2858	$since = sprintf( _n( '%s month', '%s months', $months ), $months );
2859	} elseif ( $diff >= YEAR_IN_SECONDS ) {
2860	$years = round( $diff / YEAR_IN_SECONDS );
2861	if ( $years <= 1 )
2862	$years = 1;
2863	$since = sprintf( _n( '%s year', '%s years', $years ), $years );
2864	}
2865
2866	/**
2867	* Filter the human readable difference between two timestamps.
2868	*
2869	* @since 4.0.0
2870	*
2871	* @param string $since The difference in human readable text.
2872	* @param int $diff The difference in seconds.
2873	* @param int $from Unix timestamp from which the difference begins.
2874	* @param int $to Unix timestamp to end the time difference.
2875	*/
2876	return apply_filters( 'human_time_diff', $since, $diff, $from, $to );
2877	}
2878
2879	/**
2880	* Generates an excerpt from the content, if needed.
2881	*
2882	* The excerpt word amount will be 55 words and if the amount is greater than
2883	* that, then the string ' […]' will be appended to the excerpt. If the string
2884	* is less than 55 words, then the content will be returned as is.
2885	*
2886	* The 55 word limit can be modified by plugins/themes using the excerpt_length filter
2887	* The ' […]' string can be modified by plugins/themes using the excerpt_more filter
2888	*
2889	* @since 1.5.0
2890	*
2891	* @param string $text Optional. The excerpt. If set to empty, an excerpt is generated.
2892	* @return string The excerpt.
2893	*/
2894	function wp_trim_excerpt( $text = '' ) {
2895	$raw_excerpt = $text;
2896	if ( '' == $text ) {
2897	$text = get_the_content('');
2898
2899	$text = strip_shortcodes( $text );
2900
2901	/** This filter is documented in wp-includes/post-template.php */
2902	$text = apply_filters( 'the_content', $text );
2903	$text = str_replace(']]>', ']]>', $text);
2904
2905	/**
2906	* Filter the number of words in an excerpt.
2907	*
2908	* @since 2.7.0
2909	*
2910	* @param int $number The number of words. Default 55.
2911	*/
2912	$excerpt_length = apply_filters( 'excerpt_length', 55 );
2913	/**
2914	* Filter the string in the "more" link displayed after a trimmed excerpt.
2915	*
2916	* @since 2.9.0
2917	*
2918	* @param string $more_string The string shown within the more link.
2919	*/
2920	$excerpt_more = apply_filters( 'excerpt_more', ' ' . '[…]' );
2921	$text = wp_trim_words( $text, $excerpt_length, $excerpt_more );
2922	}
2923	/**
2924	* Filter the trimmed excerpt string.
2925	*
2926	* @since 2.8.0
2927	*
2928	* @param string $text The trimmed text.
2929	* @param string $raw_excerpt The text prior to trimming.
2930	*/
2931	return apply_filters( 'wp_trim_excerpt', $text, $raw_excerpt );
2932	}
2933
2934	/**
2935	* Trims text to a certain number of words.
2936	*
2937	* This function is localized. For languages that count 'words' by the individual
2938	* character (such as East Asian languages), the $num_words argument will apply
2939	* to the number of individual characters.
2940	*
2941	* @since 3.3.0
2942	*
2943	* @param string $text Text to trim.
2944	* @param int $num_words Number of words. Default 55.
2945	* @param string $more Optional. What to append if $text needs to be trimmed. Default '…'.
2946	* @return string Trimmed text.
2947	*/
2948	function wp_trim_words( $text, $num_words = 55, $more = null ) {
2949	if ( null === $more ) {
2950	$more = __( '…' );
2951	}
2952
2953	$original_text = $text;
2954	$text = wp_strip_all_tags( $text );
2955
2956	/*
2957	* translators: If your word count is based on single characters (e.g. East Asian characters),
2958	* enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
2959	* Do not translate into your own language.
2960	*/
2961	if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
2962	$text = trim( preg_replace( "/[\n\r\t ]+/", ' ', $text ), ' ' );
2963	preg_match_all( '/./u', $text, $words_array );
2964	$words_array = array_slice( $words_array[0], 0, $num_words + 1 );
2965	$sep = '';
2966	} else {
2967	$words_array = preg_split( "/[\n\r\t ]+/", $text, $num_words + 1, PREG_SPLIT_NO_EMPTY );
2968	$sep = ' ';
2969	}
2970
2971	if ( count( $words_array ) > $num_words ) {
2972	array_pop( $words_array );
2973	$text = implode( $sep, $words_array );
2974	$text = $text . $more;
2975	} else {
2976	$text = implode( $sep, $words_array );
2977	}
2978
2979	/**
2980	* Filter the text content after words have been trimmed.
2981	*
2982	* @since 3.3.0
2983	*
2984	* @param string $text The trimmed text.
2985	* @param int $num_words The number of words to trim the text to. Default 5.
2986	* @param string $more An optional string to append to the end of the trimmed text, e.g. ….
2987	* @param string $original_text The text before it was trimmed.
2988	*/
2989	return apply_filters( 'wp_trim_words', $text, $num_words, $more, $original_text );
2990	}
2991
2992	/**
2993	* Converts named entities into numbered entities.
2994	*
2995	* @since 1.5.1
2996	*
2997	* @param string $text The text within which entities will be converted.
2998	* @return string Text with converted entities.
2999	*/
3000	function ent2ncr( $text ) {
3001
3002	/**
3003	* Filter text before named entities are converted into numbered entities.
3004	*
3005	* A non-null string must be returned for the filter to be evaluated.
3006	*
3007	* @since 3.3.0
3008	*
3009	* @param null $converted_text The text to be converted. Default null.
3010	* @param string $text The text prior to entity conversion.
3011	*/
3012	$filtered = apply_filters( 'pre_ent2ncr', null, $text );
3013	if ( null !== $filtered )
3014	return $filtered;
3015
3016	$to_ncr = array(
3017	'"' => '"',
3018	'&' => '&',
3019	'<' => '<',
3020	'>' => '>',
3021	'\|' => '\|',
3022	' ' => ' ',
3023	'¡' => '¡',
3024	'¢' => '¢',
3025	'£' => '£',
3026	'¤' => '¤',
3027	'¥' => '¥',
3028	'¦' => '¦',
3029	'&brkbar;' => '¦',
3030	'§' => '§',
3031	'¨' => '¨',
3032	'&die;' => '¨',
3033	'©' => '©',
3034	'ª' => 'ª',
3035	'«' => '«',
3036	'¬' => '¬',
3037	'' => '',
3038	'®' => '®',
3039	'¯' => '¯',
3040	'&hibar;' => '¯',
3041	'°' => '°',
3042	'±' => '±',
3043	'²' => '²',
3044	'³' => '³',
3045	'´' => '´',
3046	'µ' => 'µ',
3047	'¶' => '¶',
3048	'·' => '·',
3049	'¸' => '¸',
3050	'¹' => '¹',
3051	'º' => 'º',
3052	'»' => '»',
3053	'¼' => '¼',
3054	'½' => '½',
3055	'¾' => '¾',
3056	'¿' => '¿',
3057	'À' => 'À',
3058	'Á' => 'Á',
3059	'Â' => 'Â',
3060	'Ã' => 'Ã',
3061	'Ä' => 'Ä',
3062	'Å' => 'Å',
3063	'Æ' => 'Æ',
3064	'Ç' => 'Ç',
3065	'È' => 'È',
3066	'É' => 'É',
3067	'Ê' => 'Ê',
3068	'Ë' => 'Ë',
3069	'Ì' => 'Ì',
3070	'Í' => 'Í',
3071	'Î' => 'Î',
3072	'Ï' => 'Ï',
3073	'Ð' => 'Ð',
3074	'Ñ' => 'Ñ',
3075	'Ò' => 'Ò',
3076	'Ó' => 'Ó',
3077	'Ô' => 'Ô',
3078	'Õ' => 'Õ',
3079	'Ö' => 'Ö',
3080	'×' => '×',
3081	'Ø' => 'Ø',
3082	'Ù' => 'Ù',
3083	'Ú' => 'Ú',
3084	'Û' => 'Û',
3085	'Ü' => 'Ü',
3086	'Ý' => 'Ý',
3087	'Þ' => 'Þ',
3088	'ß' => 'ß',
3089	'à' => 'à',
3090	'á' => 'á',
3091	'â' => 'â',
3092	'ã' => 'ã',
3093	'ä' => 'ä',
3094	'å' => 'å',
3095	'æ' => 'æ',
3096	'ç' => 'ç',
3097	'è' => 'è',
3098	'é' => 'é',
3099	'ê' => 'ê',
3100	'ë' => 'ë',
3101	'ì' => 'ì',
3102	'í' => 'í',
3103	'î' => 'î',
3104	'ï' => 'ï',
3105	'ð' => 'ð',
3106	'ñ' => 'ñ',
3107	'ò' => 'ò',
3108	'ó' => 'ó',
3109	'ô' => 'ô',
3110	'õ' => 'õ',
3111	'ö' => 'ö',
3112	'÷' => '÷',
3113	'ø' => 'ø',
3114	'ù' => 'ù',
3115	'ú' => 'ú',
3116	'û' => 'û',
3117	'ü' => 'ü',
3118	'ý' => 'ý',
3119	'þ' => 'þ',
3120	'ÿ' => 'ÿ',
3121	'&OElig;' => 'Œ',
3122	'&oelig;' => 'œ',
3123	'&Scaron;' => 'Š',
3124	'&scaron;' => 'š',
3125	'&Yuml;' => 'Ÿ',
3126	'&fnof;' => 'ƒ',
3127	'&circ;' => 'ˆ',
3128	'&tilde;' => '˜',
3129	'Α' => 'Α',
3130	'Β' => 'Β',
3131	'Γ' => 'Γ',
3132	'Δ' => 'Δ',
3133	'Ε' => 'Ε',
3134	'Ζ' => 'Ζ',
3135	'Η' => 'Η',
3136	'Θ' => 'Θ',
3137	'Ι' => 'Ι',
3138	'Κ' => 'Κ',
3139	'Λ' => 'Λ',
3140	'Μ' => 'Μ',
3141	'Ν' => 'Ν',
3142	'Ξ' => 'Ξ',
3143	'Ο' => 'Ο',
3144	'Π' => 'Π',
3145	'Ρ' => 'Ρ',
3146	'Σ' => 'Σ',
3147	'Τ' => 'Τ',
3148	'Υ' => 'Υ',
3149	'Φ' => 'Φ',
3150	'Χ' => 'Χ',
3151	'Ψ' => 'Ψ',
3152	'Ω' => 'Ω',
3153	'α' => 'α',
3154	'β' => 'β',
3155	'γ' => 'γ',
3156	'δ' => 'δ',
3157	'ε' => 'ε',
3158	'ζ' => 'ζ',
3159	'η' => 'η',
3160	'θ' => 'θ',
3161	'ι' => 'ι',
3162	'κ' => 'κ',
3163	'λ' => 'λ',
3164	'μ' => 'μ',
3165	'ν' => 'ν',
3166	'ξ' => 'ξ',
3167	'ο' => 'ο',
3168	'π' => 'π',
3169	'ρ' => 'ρ',
3170	'&sigmaf;' => 'ς',
3171	'σ' => 'σ',
3172	'τ' => 'τ',
3173	'υ' => 'υ',
3174	'φ' => 'φ',
3175	'χ' => 'χ',
3176	'ψ' => 'ψ',
3177	'ω' => 'ω',
3178	'&thetasym;' => 'ϑ',
3179	'&upsih;' => 'ϒ',
3180	'ϖ' => 'ϖ',
3181	'&ensp;' => ' ',
3182	'&emsp;' => ' ',
3183	' ' => ' ',
3184	'&zwnj;' => '‌',
3185	'&zwj;' => '‍',
3186	'&lrm;' => '‎',
3187	'&rlm;' => '‏',
3188	'–' => '–',
3189	'—' => '—',
3190	'‘' => '‘',
3191	'’' => '’',
3192	'&sbquo;' => '‚',
3193	'“' => '“',
3194	'”' => '”',
3195	'&bdquo;' => '„',
3196	'&dagger;' => '†',
3197	'&Dagger;' => '‡',
3198	'•' => '•',
3199	'…' => '…',
3200	'&permil;' => '‰',
3201	'′' => '′',
3202	'″' => '″',
3203	'&lsaquo;' => '‹',
3204	'&rsaquo;' => '›',
3205	'&oline;' => '‾',
3206	'&frasl;' => '⁄',
3207	'€' => '€',
3208	'&image;' => 'ℑ',
3209	'&weierp;' => '℘',
3210	'&real;' => 'ℜ',
3211	'™' => '™',
3212	'&alefsym;' => 'ℵ',
3213	'&crarr;' => '↵',
3214	'⇐' => '⇐',
3215	'&uArr;' => '⇑',
3216	'⇒' => '⇒',
3217	'&dArr;' => '⇓',
3218	'⇔' => '⇔',
3219	'∀' => '∀',
3220	'∂' => '∂',
3221	'∃' => '∃',
3222	'∅' => '∅',
3223	'∇' => '∇',
3224	'∈' => '∈',
3225	'∉' => '∉',
3226	'&ni;' => '∋',
3227	'∏' => '∏',
3228	'∑' => '∑',
3229	'−' => '−',
3230	'&lowast;' => '∗',
3231	'√' => '√',
3232	'&prop;' => '∝',
3233	'∞' => '∞',
3234	'&ang;' => '∠',
3235	'&and;' => '∧',
3236	'&or;' => '∨',
3237	'∩' => '∩',
3238	'∪' => '∪',
3239	'∫' => '∫',
3240	'&there4;' => '∴',
3241	'&sim;' => '∼',
3242	'&cong;' => '≅',
3243	'≈' => '≈',
3244	'≠' => '≠',
3245	'&equiv;' => '≡',
3246	'≤' => '≤',
3247	'≥' => '≥',
3248	'⊂' => '⊂',
3249	'⊃' => '⊃',
3250	'&nsub;' => '⊄',
3251	'&sube;' => '⊆',
3252	'&supe;' => '⊇',
3253	'&oplus;' => '⊕',
3254	'&otimes;' => '⊗',
3255	'&perp;' => '⊥',
3256	'⋅' => '⋅',
3257	'&lceil;' => '⌈',
3258	'&rceil;' => '⌉',
3259	'&lfloor;' => '⌊',
3260	'&rfloor;' => '⌋',
3261	'&lang;' => '〈',
3262	'&rang;' => '〉',
3263	'←' => '←',
3264	'↑' => '↑',
3265	'→' => '→',
3266	'↓' => '↓',
3267	'↔' => '↔',
3268	'&loz;' => '◊',
3269	'&spades;' => '♠',
3270	'&clubs;' => '♣',
3271	'&hearts;' => '♥',
3272	'&diams;' => '♦'
3273	);
3274
3275	return str_replace( array_keys($to_ncr), array_values($to_ncr), $text );
3276	}
3277
3278	/**
3279	* Formats text for the editor.
3280	*
3281	* Generally the browsers treat everything inside a textarea as text, but
3282	* it is still a good idea to HTML entity encode `<`, `>` and `&` in the content.
3283	*
3284	* The filter {@see 'format_for_editor'} is applied here. If `$text` is empty the
3285	* filter will be applied to an empty string.
3286	*
3287	* @since 4.3.0
3288	*
3289	* @param string $text The text to be formatted.
3290	* @return string The formatted text after filter is applied.
3291	*/
3292	function format_for_editor( $text, $default_editor = null ) {
3293	if ( $text ) {
3294	$text = htmlspecialchars( $text, ENT_NOQUOTES, get_option( 'blog_charset' ) );
3295	}
3296
3297	/**
3298	* Filter the text after it is formatted for the editor.
3299	*
3300	* @since 4.3.0
3301	*
3302	* @param string $text The formatted text.
3303	*/
3304	return apply_filters( 'format_for_editor', $text, $default_editor );
3305	}
3306
3307	/**
3308	* Perform a deep string replace operation to ensure the values in $search are no longer present
3309	*
3310	* Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
3311	* e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
3312	* str_replace would return
3313	*
3314	* @since 2.8.1
3315	* @access private
3316	*
3317	* @param string\|array $search The value being searched for, otherwise known as the needle.
3318	* An array may be used to designate multiple needles.
3319	* @param string $subject The string being searched and replaced on, otherwise known as the haystack.
3320	* @return string The string with the replaced svalues.
3321	*/
3322	function _deep_replace( $search, $subject ) {
3323	$subject = (string) $subject;
3324
3325	$count = 1;
3326	while ( $count ) {
3327	$subject = str_replace( $search, '', $subject, $count );
3328	}
3329
3330	return $subject;
3331	}
3332
3333	/**
3334	* Escapes data for use in a MySQL query.
3335	*
3336	* Usually you should prepare queries using wpdb::prepare().
3337	* Sometimes, spot-escaping is required or useful. One example
3338	* is preparing an array for use in an IN clause.
3339	*
3340	* @since 2.8.0
3341	*
3342	* @global wpdb $wpdb WordPress database abstraction object.
3343	*
3344	* @param string\|array $data Unescaped data
3345	* @return string\|array Escaped data
3346	*/
3347	function esc_sql( $data ) {
3348	global $wpdb;
3349	return $wpdb->_escape( $data );
3350	}
3351
3352	/**
3353	* Checks and cleans a URL.
3354	*
3355	* A number of characters are removed from the URL. If the URL is for displaying
3356	* (the default behaviour) ampersands are also replaced. The 'clean_url' filter
3357	* is applied to the returned cleaned URL.
3358	*
3359	* @since 2.8.0
3360	*
3361	* @param string $url The URL to be cleaned.
3362	* @param array $protocols Optional. An array of acceptable protocols.
3363	* Defaults to return value of wp_allowed_protocols()
3364	* @param string $_context Private. Use esc_url_raw() for database usage.
3365	* @return string The cleaned $url after the 'clean_url' filter is applied.
3366	*/
3367	function esc_url( $url, $protocols = null, $_context = 'display' ) {
3368	$original_url = $url;
3369
3370	if ( '' == $url )
3371	return $url;
3372
3373	$url = str_replace( ' ', '%20', $url );
3374	$url = preg_replace('\|[^a-z0-9-~+_.?#=!&;,/:%@$\\|*\'()\[\]\\x80-\\xff]\|i', '', $url);
3375
3376	if ( '' === $url ) {
3377	return $url;
3378	}
3379
3380	if ( 0 !== stripos( $url, 'mailto:' ) ) {
3381	$strip = array('%0d', '%0a', '%0D', '%0A');
3382	$url = _deep_replace($strip, $url);
3383	}
3384
3385	$url = str_replace(';//', '://', $url);
3386	/* If the URL doesn't appear to contain a scheme, we
3387	* presume it needs http:// prepended (unless a relative
3388	* link starting with /, # or ? or a php file).
3389	*/
3390	if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&
3391	! preg_match('/^[a-z0-9-]+?\.php/i', $url) )
3392	$url = 'http://' . $url;
3393
3394	// Replace ampersands and single quotes only when displaying.
3395	if ( 'display' == $_context ) {
3396	$url = wp_kses_normalize_entities( $url );
3397	$url = str_replace( '&', '&', $url );
3398	$url = str_replace( "'", ''', $url );
3399	}
3400
3401	if ( ( false !== strpos( $url, '[' ) ) \|\| ( false !== strpos( $url, ']' ) ) ) {
3402
3403	$parsed = wp_parse_url( $url );
3404	$front = '';
3405
3406	if ( isset( $parsed['scheme'] ) ) {
3407	$front .= $parsed['scheme'] . '://';
3408	} elseif ( '/' === $url[0] ) {
3409	$front .= '//';
3410	}
3411
3412	if ( isset( $parsed['user'] ) ) {
3413	$front .= $parsed['user'];
3414	}
3415
3416	if ( isset( $parsed['pass'] ) ) {
3417	$front .= ':' . $parsed['pass'];
3418	}
3419
3420	if ( isset( $parsed['user'] ) \|\| isset( $parsed['pass'] ) ) {
3421	$front .= '@';
3422	}
3423
3424	if ( isset( $parsed['host'] ) ) {
3425	$front .= $parsed['host'];
3426	}
3427
3428	if ( isset( $parsed['port'] ) ) {
3429	$front .= ':' . $parsed['port'];
3430	}
3431
3432	$end_dirty = str_replace( $front, '', $url );
3433	$end_clean = str_replace( array( '[', ']' ), array( '%5B', '%5D' ), $end_dirty );
3434	$url = str_replace( $end_dirty, $end_clean, $url );
3435
3436	}
3437
3438	if ( '/' === $url[0] ) {
3439	$good_protocol_url = $url;
3440	} else {
3441	if ( ! is_array( $protocols ) )
3442	$protocols = wp_allowed_protocols();
3443	$good_protocol_url = wp_kses_bad_protocol( $url, $protocols );
3444	if ( strtolower( $good_protocol_url ) != strtolower( $url ) )
3445	return '';
3446	}
3447
3448	/**
3449	* Filter a string cleaned and escaped for output as a URL.
3450	*
3451	* @since 2.3.0
3452	*
3453	* @param string $good_protocol_url The cleaned URL to be returned.
3454	* @param string $original_url The URL prior to cleaning.
3455	* @param string $_context If 'display', replace ampersands and single quotes only.
3456	*/
3457	return apply_filters( 'clean_url', $good_protocol_url, $original_url, $_context );
3458	}
3459
3460	/**
3461	* Performs esc_url() for database usage.
3462	*
3463	* @since 2.8.0
3464	*
3465	* @param string $url The URL to be cleaned.
3466	* @param array $protocols An array of acceptable protocols.
3467	* @return string The cleaned URL.
3468	*/
3469	function esc_url_raw( $url, $protocols = null ) {
3470	return esc_url( $url, $protocols, 'db' );
3471	}
3472
3473	/**
3474	* Convert entities, while preserving already-encoded entities.
3475	*
3476	* @link http://www.php.net/htmlentities Borrowed from the PHP Manual user notes.
3477	*
3478	* @since 1.2.2
3479	*
3480	* @param string $myHTML The text to be converted.
3481	* @return string Converted text.
3482	*/
3483	function htmlentities2( $myHTML ) {
3484	$translation_table = get_html_translation_table( HTML_ENTITIES, ENT_QUOTES );
3485	$translation_table[chr(38)] = '&';
3486	return preg_replace( "/&(?![A-Za-z]{0,4}\w{2,3};\|#[0-9]{2,3};)/", "&", strtr($myHTML, $translation_table) );
3487	}
3488
3489	/**
3490	* Escape single quotes, htmlspecialchar " < > &, and fix line endings.
3491	*
3492	* Escapes text strings for echoing in JS. It is intended to be used for inline JS
3493	* (in a tag attribute, for example onclick="..."). Note that the strings have to
3494	* be in single quotes. The filter 'js_escape' is also applied here.
3495	*
3496	* @since 2.8.0
3497	*
3498	* @param string $text The text to be escaped.
3499	* @return string Escaped text.
3500	*/
3501	function esc_js( $text ) {
3502	$safe_text = wp_check_invalid_utf8( $text );
3503	$safe_text = _wp_specialchars( $safe_text, ENT_COMPAT );
3504	$safe_text = preg_replace( '/&#(x)?0*(?(1)27\|39);?/i', "'", stripslashes( $safe_text ) );
3505	$safe_text = str_replace( "\r", '', $safe_text );
3506	$safe_text = str_replace( "\n", '\\n', addslashes( $safe_text ) );
3507	/**
3508	* Filter a string cleaned and escaped for output in JavaScript.
3509	*
3510	* Text passed to esc_js() is stripped of invalid or special characters,
3511	* and properly slashed for output.
3512	*
3513	* @since 2.0.6
3514	*
3515	* @param string $safe_text The text after it has been escaped.
3516	* @param string $text The text prior to being escaped.
3517	*/
3518	return apply_filters( 'js_escape', $safe_text, $text );
3519	}
3520
3521	/**
3522	* Escaping for HTML blocks.
3523	*
3524	* @since 2.8.0
3525	*
3526	* @param string $text
3527	* @return string
3528	*/
3529	function esc_html( $text ) {
3530	$safe_text = wp_check_invalid_utf8( $text );
3531	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
3532	/**
3533	* Filter a string cleaned and escaped for output in HTML.
3534	*
3535	* Text passed to esc_html() is stripped of invalid or special characters
3536	* before output.
3537	*
3538	* @since 2.8.0
3539	*
3540	* @param string $safe_text The text after it has been escaped.
3541	* @param string $text The text prior to being escaped.
3542	*/
3543	return apply_filters( 'esc_html', $safe_text, $text );
3544	}
3545
3546	/**
3547	* Escaping for HTML attributes.
3548	*
3549	* @since 2.8.0
3550	*
3551	* @param string $text
3552	* @return string
3553	*/
3554	function esc_attr( $text ) {
3555	$safe_text = wp_check_invalid_utf8( $text );
3556	$safe_text = _wp_specialchars( $safe_text, ENT_QUOTES );
3557	/**
3558	* Filter a string cleaned and escaped for output in an HTML attribute.
3559	*
3560	* Text passed to esc_attr() is stripped of invalid or special characters
3561	* before output.
3562	*
3563	* @since 2.0.6
3564	*
3565	* @param string $safe_text The text after it has been escaped.
3566	* @param string $text The text prior to being escaped.
3567	*/
3568	return apply_filters( 'attribute_escape', $safe_text, $text );
3569	}
3570
3571	/**
3572	* Escaping for textarea values.
3573	*
3574	* @since 3.1.0
3575	*
3576	* @param string $text
3577	* @return string
3578	*/
3579	function esc_textarea( $text ) {
3580	$safe_text = htmlspecialchars( $text, ENT_QUOTES, get_option( 'blog_charset' ) );
3581	/**
3582	* Filter a string cleaned and escaped for output in a textarea element.
3583	*
3584	* @since 3.1.0
3585	*
3586	* @param string $safe_text The text after it has been escaped.
3587	* @param string $text The text prior to being escaped.
3588	*/
3589	return apply_filters( 'esc_textarea', $safe_text, $text );
3590	}
3591
3592	/**
3593	* Escape an HTML tag name.
3594	*
3595	* @since 2.5.0
3596	*
3597	* @param string $tag_name
3598	* @return string
3599	*/
3600	function tag_escape( $tag_name ) {
3601	$safe_tag = strtolower( preg_replace('/[^a-zA-Z0-9_:]/', '', $tag_name) );
3602	/**
3603	* Filter a string cleaned and escaped for output as an HTML tag.
3604	*
3605	* @since 2.8.0
3606	*
3607	* @param string $safe_tag The tag name after it has been escaped.
3608	* @param string $tag_name The text before it was escaped.
3609	*/
3610	return apply_filters( 'tag_escape', $safe_tag, $tag_name );
3611	}
3612
3613	/**
3614	* Convert full URL paths to absolute paths.
3615	*
3616	* Removes the http or https protocols and the domain. Keeps the path '/' at the
3617	* beginning, so it isn't a true relative link, but from the web root base.
3618	*
3619	* @since 2.1.0
3620	* @since 4.1.0 Support was added for relative URLs.
3621	*
3622	* @param string $link Full URL path.
3623	* @return string Absolute path.
3624	*/
3625	function wp_make_link_relative( $link ) {
3626	return preg_replace( '\|^(https?:)?//[^/]+(/?.*)\|i', '$2', $link );
3627	}
3628
3629	/**
3630	* Sanitises various option values based on the nature of the option.
3631	*
3632	* This is basically a switch statement which will pass $value through a number
3633	* of functions depending on the $option.
3634	*
3635	* @since 2.0.5
3636	*
3637	* @global wpdb $wpdb WordPress database abstraction object.
3638	*
3639	* @param string $option The name of the option.
3640	* @param string $value The unsanitised value.
3641	* @return string Sanitized value.
3642	*/
3643	function sanitize_option( $option, $value ) {
3644	global $wpdb;
3645
3646	$original_value = $value;
3647	$error = '';
3648
3649	switch ( $option ) {
3650	case 'admin_email' :
3651	case 'new_admin_email' :
3652	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3653	if ( is_wp_error( $value ) ) {
3654	$error = $value->get_error_message();
3655	} else {
3656	$value = sanitize_email( $value );
3657	if ( ! is_email( $value ) ) {
3658	$error = __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' );
3659	}
3660	}
3661	break;
3662
3663	case 'thumbnail_size_w':
3664	case 'thumbnail_size_h':
3665	case 'medium_size_w':
3666	case 'medium_size_h':
3667	case 'medium_large_size_w':
3668	case 'medium_large_size_h':
3669	case 'large_size_w':
3670	case 'large_size_h':
3671	case 'mailserver_port':
3672	case 'comment_max_links':
3673	case 'page_on_front':
3674	case 'page_for_posts':
3675	case 'rss_excerpt_length':
3676	case 'default_category':
3677	case 'default_email_category':
3678	case 'default_link_category':
3679	case 'close_comments_days_old':
3680	case 'comments_per_page':
3681	case 'thread_comments_depth':
3682	case 'users_can_register':
3683	case 'start_of_week':
3684	case 'site_icon':
3685	$value = absint( $value );
3686	break;
3687
3688	case 'posts_per_page':
3689	case 'posts_per_rss':
3690	$value = (int) $value;
3691	if ( empty($value) )
3692	$value = 1;
3693	if ( $value < -1 )
3694	$value = abs($value);
3695	break;
3696
3697	case 'default_ping_status':
3698	case 'default_comment_status':
3699	// Options that if not there have 0 value but need to be something like "closed"
3700	if ( $value == '0' \|\| $value == '')
3701	$value = 'closed';
3702	break;
3703
3704	case 'blogdescription':
3705	case 'blogname':
3706	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3707	if ( is_wp_error( $value ) ) {
3708	$error = $value->get_error_message();
3709	} else {
3710	$value = wp_kses_post( $value );
3711	$value = esc_html( $value );
3712	}
3713	break;
3714
3715	case 'blog_charset':
3716	$value = preg_replace('/[^a-zA-Z0-9_-]/', '', $value); // strips slashes
3717	break;
3718
3719	case 'blog_public':
3720	// This is the value if the settings checkbox is not checked on POST. Don't rely on this.
3721	if ( null === $value )
3722	$value = 1;
3723	else
3724	$value = intval( $value );
3725	break;
3726
3727	case 'date_format':
3728	case 'time_format':
3729	case 'mailserver_url':
3730	case 'mailserver_login':
3731	case 'mailserver_pass':
3732	case 'upload_path':
3733	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3734	if ( is_wp_error( $value ) ) {
3735	$error = $value->get_error_message();
3736	} else {
3737	$value = strip_tags( $value );
3738	$value = wp_kses_data( $value );
3739	}
3740	break;
3741
3742	case 'ping_sites':
3743	$value = explode( "\n", $value );
3744	$value = array_filter( array_map( 'trim', $value ) );
3745	$value = array_filter( array_map( 'esc_url_raw', $value ) );
3746	$value = implode( "\n", $value );
3747	break;
3748
3749	case 'gmt_offset':
3750	$value = preg_replace('/[^0-9:.-]/', '', $value); // strips slashes
3751	break;
3752
3753	case 'siteurl':
3754	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3755	if ( is_wp_error( $value ) ) {
3756	$error = $value->get_error_message();
3757	} else {
3758	if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
3759	$value = esc_url_raw( $value );
3760	} else {
3761	$error = __( 'The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.' );
3762	}
3763	}
3764	break;
3765
3766	case 'home':
3767	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3768	if ( is_wp_error( $value ) ) {
3769	$error = $value->get_error_message();
3770	} else {
3771	if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
3772	$value = esc_url_raw( $value );
3773	} else {
3774	$error = __( 'The Site address you entered did not appear to be a valid URL. Please enter a valid URL.' );
3775	}
3776	}
3777	break;
3778
3779	case 'WPLANG':
3780	$allowed = get_available_languages();
3781	if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {
3782	$allowed[] = WPLANG;
3783	}
3784	if ( ! in_array( $value, $allowed ) && ! empty( $value ) ) {
3785	$value = get_option( $option );
3786	}
3787	break;
3788
3789	case 'illegal_names':
3790	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3791	if ( is_wp_error( $value ) ) {
3792	$error = $value->get_error_message();
3793	} else {
3794	if ( ! is_array( $value ) )
3795	$value = explode( ' ', $value );
3796
3797	$value = array_values( array_filter( array_map( 'trim', $value ) ) );
3798
3799	if ( ! $value )
3800	$value = '';
3801	}
3802	break;
3803
3804	case 'limited_email_domains':
3805	case 'banned_email_domains':
3806	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3807	if ( is_wp_error( $value ) ) {
3808	$error = $value->get_error_message();
3809	} else {
3810	if ( ! is_array( $value ) )
3811	$value = explode( "\n", $value );
3812
3813	$domains = array_values( array_filter( array_map( 'trim', $value ) ) );
3814	$value = array();
3815
3816	foreach ( $domains as $domain ) {
3817	if ( ! preg_match( '/(--\|\.\.)/', $domain ) && preg_match( '\|^([a-zA-Z0-9-\.])+$\|', $domain ) ) {
3818	$value[] = $domain;
3819	}
3820	}
3821	if ( ! $value )
3822	$value = '';
3823	}
3824	break;
3825
3826	case 'timezone_string':
3827	$allowed_zones = timezone_identifiers_list();
3828	if ( ! in_array( $value, $allowed_zones ) && ! empty( $value ) ) {
3829	$error = __( 'The timezone you have entered is not valid. Please select a valid timezone.' );
3830	}
3831	break;
3832
3833	case 'permalink_structure':
3834	case 'category_base':
3835	case 'tag_base':
3836	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3837	if ( is_wp_error( $value ) ) {
3838	$error = $value->get_error_message();
3839	} else {
3840	$value = esc_url_raw( $value );
3841	$value = str_replace( 'http://', '', $value );
3842	}
3843	break;
3844
3845	case 'default_role' :
3846	if ( ! get_role( $value ) && get_role( 'subscriber' ) )
3847	$value = 'subscriber';
3848	break;
3849
3850	case 'moderation_keys':
3851	case 'blacklist_keys':
3852	$value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
3853	if ( is_wp_error( $value ) ) {
3854	$error = $value->get_error_message();
3855	} else {
3856	$value = explode( "\n", $value );
3857	$value = array_filter( array_map( 'trim', $value ) );
3858	$value = array_unique( $value );
3859	$value = implode( "\n", $value );
3860	}
3861	break;
3862	}
3863
3864	if ( ! empty( $error ) ) {
3865	$value = get_option( $option );
3866	if ( function_exists( 'add_settings_error' ) ) {
3867	add_settings_error( $option, "invalid_{$option}", $error );
3868	}
3869	}
3870
3871	/**
3872	* Filter an option value following sanitization.
3873	*
3874	* @since 2.3.0
3875	* @since 4.3.0 Added the `$original_value` parameter.
3876	*
3877	* @param string $value The sanitized option value.
3878	* @param string $option The option name.
3879	* @param string $original_value The original value passed to the function.
3880	*/
3881	return apply_filters( "sanitize_option_{$option}", $value, $option, $original_value );
3882	}
3883
3884	/**
3885	* Maps a function to all non-iterable elements of an array or an object.
3886	*
3887	* This is similar to `array_walk_recursive()` but acts upon objects too.
3888	*
3889	* @since 4.4.0
3890	*
3891	* @param mixed $value The array, object, or scalar.
3892	* @param callable $callback The function to map onto $value.
3893	* @return The value with the callback applied to all non-arrays and non-objects inside it.
3894	*/
3895	function map_deep( $value, $callback ) {
3896	if ( is_array( $value ) \|\| is_object( $value ) ) {
3897	foreach ( $value as &$item ) {
3898	$item = map_deep( $item, $callback );
3899	}
3900	return $value;
3901	} else {
3902	return call_user_func( $callback, $value );
3903	}
3904	}
3905
3906	/**
3907	* Parses a string into variables to be stored in an array.
3908	*
3909	* Uses {@link http://www.php.net/parse_str parse_str()} and stripslashes if
3910	* {@link http://www.php.net/magic_quotes magic_quotes_gpc} is on.
3911	*
3912	* @since 2.2.1
3913	*
3914	* @param string $string The string to be parsed.
3915	* @param array $array Variables will be stored in this array.
3916	*/
3917	function wp_parse_str( $string, &$array ) {
3918	parse_str( $string, $array );
3919	if ( get_magic_quotes_gpc() )
3920	$array = stripslashes_deep( $array );
3921	/**
3922	* Filter the array of variables derived from a parsed string.
3923	*
3924	* @since 2.3.0
3925	*
3926	* @param array $array The array populated with variables.
3927	*/
3928	$array = apply_filters( 'wp_parse_str', $array );
3929	}
3930
3931	/**
3932	* Convert lone less than signs.
3933	*
3934	* KSES already converts lone greater than signs.
3935	*
3936	* @since 2.3.0
3937	*
3938	* @param string $text Text to be converted.
3939	* @return string Converted text.
3940	*/
3941	function wp_pre_kses_less_than( $text ) {
3942	return preg_replace_callback('%<[^>]*?((?=<)\|>\|$)%', 'wp_pre_kses_less_than_callback', $text);
3943	}
3944
3945	/**
3946	* Callback function used by preg_replace.
3947	*
3948	* @since 2.3.0
3949	*
3950	* @param array $matches Populated by matches to preg_replace.
3951	* @return string The text returned after esc_html if needed.
3952	*/
3953	function wp_pre_kses_less_than_callback( $matches ) {
3954	if ( false === strpos($matches[0], '>') )
3955	return esc_html($matches[0]);
3956	return $matches[0];
3957	}
3958
3959	/**
3960	* WordPress implementation of PHP sprintf() with filters.
3961	*
3962	* @since 2.5.0
3963	* @link http://www.php.net/sprintf
3964	*
3965	* @param string $pattern The string which formatted args are inserted.
3966	* @param mixed $args ,... Arguments to be formatted into the $pattern string.
3967	* @return string The formatted string.
3968	*/
3969	function wp_sprintf( $pattern ) {
3970	$args = func_get_args();
3971	$len = strlen($pattern);
3972	$start = 0;
3973	$result = '';
3974	$arg_index = 0;
3975	while ( $len > $start ) {
3976	// Last character: append and break
3977	if ( strlen($pattern) - 1 == $start ) {
3978	$result .= substr($pattern, -1);
3979	break;
3980	}
3981
3982	// Literal %: append and continue
3983	if ( substr($pattern, $start, 2) == '%%' ) {
3984	$start += 2;
3985	$result .= '%';
3986	continue;
3987	}
3988
3989	// Get fragment before next %
3990	$end = strpos($pattern, '%', $start + 1);
3991	if ( false === $end )
3992	$end = $len;
3993	$fragment = substr($pattern, $start, $end - $start);
3994
3995	// Fragment has a specifier
3996	if ( $pattern[$start] == '%' ) {
3997	// Find numbered arguments or take the next one in order
3998	if ( preg_match('/^%(\d+)\$/', $fragment, $matches) ) {
3999	$arg = isset($args[$matches[1]]) ? $args[$matches[1]] : '';
4000	$fragment = str_replace("%{$matches[1]}$", '%', $fragment);
4001	} else {
4002	++$arg_index;
4003	$arg = isset($args[$arg_index]) ? $args[$arg_index] : '';
4004	}
4005
4006	/**
4007	* Filter a fragment from the pattern passed to wp_sprintf().
4008	*
4009	* If the fragment is unchanged, then sprintf() will be run on the fragment.
4010	*
4011	* @since 2.5.0
4012	*
4013	* @param string $fragment A fragment from the pattern.
4014	* @param string $arg The argument.
4015	*/
4016	$_fragment = apply_filters( 'wp_sprintf', $fragment, $arg );
4017	if ( $_fragment != $fragment )
4018	$fragment = $_fragment;
4019	else
4020	$fragment = sprintf($fragment, strval($arg) );
4021	}
4022
4023	// Append to result and move to next fragment
4024	$result .= $fragment;
4025	$start = $end;
4026	}
4027	return $result;
4028	}
4029
4030	/**
4031	* Localize list items before the rest of the content.
4032	*
4033	* The '%l' must be at the first characters can then contain the rest of the
4034	* content. The list items will have ', ', ', and', and ' and ' added depending
4035	* on the amount of list items in the $args parameter.
4036	*
4037	* @since 2.5.0
4038	*
4039	* @param string $pattern Content containing '%l' at the beginning.
4040	* @param array $args List items to prepend to the content and replace '%l'.
4041	* @return string Localized list items and rest of the content.
4042	*/
4043	function wp_sprintf_l( $pattern, $args ) {
4044	// Not a match
4045	if ( substr($pattern, 0, 2) != '%l' )
4046	return $pattern;
4047
4048	// Nothing to work with
4049	if ( empty($args) )
4050	return '';
4051
4052	/**
4053	* Filter the translated delimiters used by wp_sprintf_l().
4054	* Placeholders (%s) are included to assist translators and then
4055	* removed before the array of strings reaches the filter.
4056	*
4057	* Please note: Ampersands and entities should be avoided here.
4058	*
4059	* @since 2.5.0
4060	*
4061	* @param array $delimiters An array of translated delimiters.
4062	*/
4063	$l = apply_filters( 'wp_sprintf_l', array(
4064	/* translators: used to join items in a list with more than 2 items */
4065	'between' => sprintf( __('%s, %s'), '', '' ),
4066	/* translators: used to join last two items in a list with more than 2 times */
4067	'between_last_two' => sprintf( __('%s, and %s'), '', '' ),
4068	/* translators: used to join items in a list with only 2 items */
4069	'between_only_two' => sprintf( __('%s and %s'), '', '' ),
4070	) );
4071
4072	$args = (array) $args;
4073	$result = array_shift($args);
4074	if ( count($args) == 1 )
4075	$result .= $l['between_only_two'] . array_shift($args);
4076	// Loop when more than two args
4077	$i = count($args);
4078	while ( $i ) {
4079	$arg = array_shift($args);
4080	$i--;
4081	if ( 0 == $i )
4082	$result .= $l['between_last_two'] . $arg;
4083	else
4084	$result .= $l['between'] . $arg;
4085	}
4086	return $result . substr($pattern, 2);
4087	}
4088
4089	/**
4090	* Safely extracts not more than the first $count characters from html string.
4091	*
4092	* UTF-8, tags and entities safe prefix extraction. Entities inside will NOT
4093	* be counted as one character. For example & will be counted as 4, < as
4094	* 3, etc.
4095	*
4096	* @since 2.5.0
4097	*
4098	* @param string $str String to get the excerpt from.
4099	* @param int $count Maximum number of characters to take.
4100	* @param string $more Optional. What to append if $str needs to be trimmed. Defaults to empty string.
4101	* @return string The excerpt.
4102	*/
4103	function wp_html_excerpt( $str, $count, $more = null ) {
4104	if ( null === $more )
4105	$more = '';
4106	$str = wp_strip_all_tags( $str, true );
4107	$excerpt = mb_substr( $str, 0, $count );
4108	// remove part of an entity at the end
4109	$excerpt = preg_replace( '/&[^;\s]{0,6}$/', '', $excerpt );
4110	if ( $str != $excerpt )
4111	$excerpt = trim( $excerpt ) . $more;
4112	return $excerpt;
4113	}
4114
4115	/**
4116	* Add a Base url to relative links in passed content.
4117	*
4118	* By default it supports the 'src' and 'href' attributes. However this can be
4119	* changed via the 3rd param.
4120	*
4121	* @since 2.7.0
4122	*
4123	* @global string $_links_add_base
4124	*
4125	* @param string $content String to search for links in.
4126	* @param string $base The base URL to prefix to links.
4127	* @param array $attrs The attributes which should be processed.
4128	* @return string The processed content.
4129	*/
4130	function links_add_base_url( $content, $base, $attrs = array('src', 'href') ) {
4131	global $_links_add_base;
4132	$_links_add_base = $base;
4133	$attrs = implode('\|', (array)$attrs);
4134	return preg_replace_callback( "!($attrs)=(['\"])(.+?)\\2!i", '_links_add_base', $content );
4135	}
4136
4137	/**
4138	* Callback to add a base url to relative links in passed content.
4139	*
4140	* @since 2.7.0
4141	* @access private
4142	*
4143	* @global string $_links_add_base
4144	*
4145	* @param string $m The matched link.
4146	* @return string The processed link.
4147	*/
4148	function _links_add_base( $m ) {
4149	global $_links_add_base;
4150	//1 = attribute name 2 = quotation mark 3 = URL
4151	return $m[1] . '=' . $m[2] .
4152	( preg_match( '#^(\w{1,20}):#', $m[3], $protocol ) && in_array( $protocol[1], wp_allowed_protocols() ) ?
4153	$m[3] :
4154	WP_Http::make_absolute_url( $m[3], $_links_add_base )
4155	)
4156	. $m[2];
4157	}
4158
4159	/**
4160	* Adds a Target attribute to all links in passed content.
4161	*
4162	* This function by default only applies to `<a>` tags, however this can be
4163	* modified by the 3rd param.
4164	*
4165	* NOTE: Any current target attributed will be stripped and replaced.
4166	*
4167	* @since 2.7.0
4168	*
4169	* @global string $_links_add_target
4170	*
4171	* @param string $content String to search for links in.
4172	* @param string $target The Target to add to the links.
4173	* @param array $tags An array of tags to apply to.
4174	* @return string The processed content.
4175	*/
4176	function links_add_target( $content, $target = '_blank', $tags = array('a') ) {
4177	global $_links_add_target;
4178	$_links_add_target = $target;
4179	$tags = implode('\|', (array)$tags);
4180	return preg_replace_callback( "!<($tags)([^>]*)>!i", '_links_add_target', $content );
4181	}
4182
4183	/**
4184	* Callback to add a target attribute to all links in passed content.
4185	*
4186	* @since 2.7.0
4187	* @access private
4188	*
4189	* @global string $_links_add_target
4190	*
4191	* @param string $m The matched link.
4192	* @return string The processed link.
4193	*/
4194	function _links_add_target( $m ) {
4195	global $_links_add_target;
4196	$tag = $m[1];
4197	$link = preg_replace('\|( target=([\'"])(.*?)\2)\|i', '', $m[2]);
4198	return '<' . $tag . $link . ' target="' . esc_attr( $_links_add_target ) . '">';
4199	}
4200
4201	/**
4202	* Normalize EOL characters and strip duplicate whitespace.
4203	*
4204	* @since 2.7.0
4205	*
4206	* @param string $str The string to normalize.
4207	* @return string The normalized string.
4208	*/
4209	function normalize_whitespace( $str ) {
4210	$str = trim( $str );
4211	$str = str_replace( "\r", "\n", $str );
4212	$str = preg_replace( array( '/\n+/', '/[ \t]+/' ), array( "\n", ' ' ), $str );
4213	return $str;
4214	}
4215
4216	/**
4217	* Properly strip all HTML tags including script and style
4218	*
4219	* This differs from strip_tags() because it removes the contents of
4220	* the `<script>` and `<style>` tags. E.g. `strip_tags( '<script>something</script>' )`
4221	* will return 'something'. wp_strip_all_tags will return ''
4222	*
4223	* @since 2.9.0
4224	*
4225	* @param string $string String containing HTML tags
4226	* @param bool $remove_breaks Optional. Whether to remove left over line breaks and white space chars
4227	* @return string The processed string.
4228	*/
4229	function wp_strip_all_tags($string, $remove_breaks = false) {
4230	$string = preg_replace( '@<(script\|style)[^>]?>.?</\\1>@si', '', $string );
4231	$string = strip_tags($string);
4232
4233	if ( $remove_breaks )
4234	$string = preg_replace('/[\r\n\t ]+/', ' ', $string);
4235
4236	return trim( $string );
4237	}
4238
4239	/**
4240	* Sanitize a string from user input or from the db
4241	*
4242	* check for invalid UTF-8,
4243	* Convert single < characters to entity,
4244	* strip all tags,
4245	* remove line breaks, tabs and extra white space,
4246	* strip octets.
4247	*
4248	* @since 2.9.0
4249	*
4250	* @param string $str
4251	* @return string
4252	*/
4253	function sanitize_text_field( $str ) {
4254	$filtered = wp_check_invalid_utf8( $str );
4255
4256	if ( strpos($filtered, '<') !== false ) {
4257	$filtered = wp_pre_kses_less_than( $filtered );
4258	// This will strip extra whitespace for us.
4259	$filtered = wp_strip_all_tags( $filtered, true );
4260	} else {
4261	$filtered = trim( preg_replace('/[\r\n\t ]+/', ' ', $filtered) );
4262	}
4263
4264	$found = false;
4265	while ( preg_match('/%[a-f0-9]{2}/i', $filtered, $match) ) {
4266	$filtered = str_replace($match[0], '', $filtered);
4267	$found = true;
4268	}
4269
4270	if ( $found ) {
4271	// Strip out the whitespace that may now exist after removing the octets.
4272	$filtered = trim( preg_replace('/ +/', ' ', $filtered) );
4273	}
4274
4275	/**
4276	* Filter a sanitized text field string.
4277	*
4278	* @since 2.9.0
4279	*
4280	* @param string $filtered The sanitized string.
4281	* @param string $str The string prior to being sanitized.
4282	*/
4283	return apply_filters( 'sanitize_text_field', $filtered, $str );
4284	}
4285
4286	/**
4287	* i18n friendly version of basename()
4288	*
4289	* @since 3.1.0
4290	*
4291	* @param string $path A path.
4292	* @param string $suffix If the filename ends in suffix this will also be cut off.
4293	* @return string
4294	*/
4295	function wp_basename( $path, $suffix = '' ) {
4296	return urldecode( basename( str_replace( array( '%2F', '%5C' ), '/', urlencode( $path ) ), $suffix ) );
4297	}
4298
4299	/**
4300	* Forever eliminate "Wordpress" from the planet (or at least the little bit we can influence).
4301	*
4302	* Violating our coding standards for a good function name.
4303	*
4304	* @since 3.0.0
4305	*
4306	* @staticvar string\|false $dblq
4307	*/
4308	function capital_P_dangit( $text ) {
4309	// Simple replacement for titles
4310	$current_filter = current_filter();
4311	if ( 'the_title' === $current_filter \|\| 'wp_title' === $current_filter )
4312	return str_replace( 'Wordpress', 'WordPress', $text );
4313	// Still here? Use the more judicious replacement
4314	static $dblq = false;
4315	if ( false === $dblq ) {
4316	$dblq = _x( '“', 'opening curly double quote' );
4317	}
4318	return str_replace(
4319	array( ' Wordpress', '‘Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),
4320	array( ' WordPress', '‘WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),
4321	$text );
4322	}
4323
4324	/**
4325	* Sanitize a mime type
4326	*
4327	* @since 3.1.3
4328	*
4329	* @param string $mime_type Mime type
4330	* @return string Sanitized mime type
4331	*/
4332	function sanitize_mime_type( $mime_type ) {
4333	$sani_mime_type = preg_replace( '/[^-+*.a-zA-Z0-9\/]/', '', $mime_type );
4334	/**
4335	* Filter a mime type following sanitization.
4336	*
4337	* @since 3.1.3
4338	*
4339	* @param string $sani_mime_type The sanitized mime type.
4340	* @param string $mime_type The mime type prior to sanitization.
4341	*/
4342	return apply_filters( 'sanitize_mime_type', $sani_mime_type, $mime_type );
4343	}
4344
4345	/**
4346	* Sanitize space or carriage return separated URLs that are used to send trackbacks.
4347	*
4348	* @since 3.4.0
4349	*
4350	* @param string $to_ping Space or carriage return separated URLs
4351	* @return string URLs starting with the http or https protocol, separated by a carriage return.
4352	*/
4353	function sanitize_trackback_urls( $to_ping ) {
4354	$urls_to_ping = preg_split( '/[\r\n\t ]/', trim( $to_ping ), -1, PREG_SPLIT_NO_EMPTY );
4355	foreach ( $urls_to_ping as $k => $url ) {
4356	if ( !preg_match( '#^https?://.#i', $url ) )
4357	unset( $urls_to_ping[$k] );
4358	}
4359	$urls_to_ping = array_map( 'esc_url_raw', $urls_to_ping );
4360	$urls_to_ping = implode( "\n", $urls_to_ping );
4361	/**
4362	* Filter a list of trackback URLs following sanitization.
4363	*
4364	* The string returned here consists of a space or carriage return-delimited list
4365	* of trackback URLs.
4366	*
4367	* @since 3.4.0
4368	*
4369	* @param string $urls_to_ping Sanitized space or carriage return separated URLs.
4370	* @param string $to_ping Space or carriage return separated URLs before sanitization.
4371	*/
4372	return apply_filters( 'sanitize_trackback_urls', $urls_to_ping, $to_ping );
4373	}
4374
4375	/**
4376	* Add slashes to a string or array of strings.
4377	*
4378	* This should be used when preparing data for core API that expects slashed data.
4379	* This should not be used to escape data going directly into an SQL query.
4380	*
4381	* @since 3.6.0
4382	*
4383	* @param string\|array $value String or array of strings to slash.
4384	* @return string\|array Slashed $value
4385	*/
4386	function wp_slash( $value ) {
4387	if ( is_array( $value ) ) {
4388	foreach ( $value as $k => $v ) {
4389	if ( is_array( $v ) ) {
4390	$value[$k] = wp_slash( $v );
4391	} else {
4392	$value[$k] = addslashes( $v );
4393	}
4394	}
4395	} else {
4396	$value = addslashes( $value );
4397	}
4398
4399	return $value;
4400	}
4401
4402	/**
4403	* Remove slashes from a string or array of strings.
4404	*
4405	* This should be used to remove slashes from data passed to core API that
4406	* expects data to be unslashed.
4407	*
4408	* @since 3.6.0
4409	*
4410	* @param string\|array $value String or array of strings to unslash.
4411	* @return string\|array Unslashed $value
4412	*/
4413	function wp_unslash( $value ) {
4414	return stripslashes_deep( $value );
4415	}
4416
4417	/**
4418	* Extract and return the first URL from passed content.
4419	*
4420	* @since 3.6.0
4421	*
4422	* @param string $content A string which might contain a URL.
4423	* @return string\|false The found URL.
4424	*/
4425	function get_url_in_content( $content ) {
4426	if ( empty( $content ) ) {
4427	return false;
4428	}
4429
4430	if ( preg_match( '/<a\s[^>]*?href=([\'"])(.+?)\1/is', $content, $matches ) ) {
4431	return esc_url_raw( $matches[2] );
4432	}
4433
4434	return false;
4435	}
4436
4437	/**
4438	* Returns the regexp for common whitespace characters.
4439	*
4440	* By default, spaces include new lines, tabs, nbsp entities, and the UTF-8 nbsp.
4441	* This is designed to replace the PCRE \s sequence. In ticket #22692, that
4442	* sequence was found to be unreliable due to random inclusion of the A0 byte.
4443	*
4444	* @since 4.0.0
4445	*
4446	* @staticvar string $spaces
4447	*
4448	* @return string The spaces regexp.
4449	*/
4450	function wp_spaces_regexp() {
4451	static $spaces = '';
4452
4453	if ( empty( $spaces ) ) {
4454	/**
4455	* Filter the regexp for common whitespace characters.
4456	*
4457	* This string is substituted for the \s sequence as needed in regular
4458	* expressions. For websites not written in English, different characters
4459	* may represent whitespace. For websites not encoded in UTF-8, the 0xC2 0xA0
4460	* sequence may not be in use.
4461	*
4462	* @since 4.0.0
4463	*
4464	* @param string $spaces Regexp pattern for matching common whitespace characters.
4465	*/
4466	$spaces = apply_filters( 'wp_spaces_regexp', '[\r\n\t ]\|\xC2\xA0\| ' );
4467	}
4468
4469	return $spaces;
4470	}
4471
4472	/**
4473	* Print the important emoji-related styles.
4474	*
4475	* @since 4.2.0
4476	*
4477	* @staticvar bool $printed
4478	*/
4479	function print_emoji_styles() {
4480	static $printed = false;
4481
4482	if ( $printed ) {
4483	return;
4484	}
4485
4486	$printed = true;
4487	?>
4488	<style type="text/css">
4489	img.wp-smiley,
4490	img.emoji {
4491	display: inline !important;
4492	border: none !important;
4493	box-shadow: none !important;
4494	height: 1em !important;
4495	width: 1em !important;
4496	margin: 0 .07em !important;
4497	vertical-align: -0.1em !important;
4498	background: none !important;
4499	padding: 0 !important;
4500	}
4501	</style>
4502	<?php
4503	}
4504
4505	/**
4506	*
4507	* @global string $wp_version
4508	* @staticvar bool $printed
4509	*/
4510	function print_emoji_detection_script() {
4511	global $wp_version;
4512	static $printed = false;
4513
4514	if ( $printed ) {
4515	return;
4516	}
4517
4518	$printed = true;
4519
4520	$settings = array(
4521	/**
4522	* Filter the URL where emoji images are hosted.
4523	*
4524	* @since 4.2.0
4525	*
4526	* @param string The emoji base URL.
4527	*/
4528	'baseUrl' => apply_filters( 'emoji_url', set_url_scheme( '//s.w.org/images/core/emoji/72x72/' ) ),
4529
4530	/**
4531	* Filter the extension of the emoji files.
4532	*
4533	* @since 4.2.0
4534	*
4535	* @param string The emoji extension. Default .png.
4536	*/
4537	'ext' => apply_filters( 'emoji_ext', '.png' ),
4538	);
4539
4540	$version = 'ver=' . $wp_version;
4541
4542	if ( SCRIPT_DEBUG ) {
4543	$settings['source'] = array(
4544	/** This filter is documented in wp-includes/class.wp-scripts.php */
4545	'wpemoji' => apply_filters( 'script_loader_src', includes_url( "js/wp-emoji.js?$version" ), 'wpemoji' ),
4546	/** This filter is documented in wp-includes/class.wp-scripts.php */
4547	'twemoji' => apply_filters( 'script_loader_src', includes_url( "js/twemoji.js?$version" ), 'twemoji' ),
4548	);
4549
4550	?>
4551	<script type="text/javascript">
4552	window._wpemojiSettings = <?php echo wp_json_encode( $settings ); ?>;
4553	<?php readfile( ABSPATH . WPINC . "/js/wp-emoji-loader.js" ); ?>
4554	</script>
4555	<?php
4556	} else {
4557	$settings['source'] = array(
4558	/** This filter is documented in wp-includes/class.wp-scripts.php */
4559	'concatemoji' => apply_filters( 'script_loader_src', includes_url( "js/wp-emoji-release.min.js?$version" ), 'concatemoji' ),
4560	);
4561
4562	/*
4563	* If you're looking at a src version of this file, you'll see an "include"
4564	* statement below. This is used by the `grunt build` process to directly
4565	* include a minified version of wp-emoji-loader.js, instead of using the
4566	* readfile() method from above.
4567	*
4568	* If you're looking at a build version of this file, you'll see a string of
4569	* minified JavaScript. If you need to debug it, please turn on SCRIPT_DEBUG
4570	* and edit wp-emoji-loader.js directly.
4571	*/
4572	?>
4573	<script type="text/javascript">
4574	window._wpemojiSettings = <?php echo wp_json_encode( $settings ); ?>;
4575	!function(a,b,c){function d(a){var c=b.createElement("canvas"),d=c.getContext&&c.getContext("2d");return d&&d.fillText?(d.textBaseline="top",d.font="600 32px Arial","flag"===a?(d.fillText(String.fromCharCode(55356,56806,55356,56826),0,0),c.toDataURL().length>3e3):("simple"===a?d.fillText(String.fromCharCode(55357,56835),0,0):d.fillText(String.fromCharCode(55356,57135),0,0),0!==d.getImageData(16,16,1,1).data[0])):!1}function e(a){var c=b.createElement("script");c.src=a,c.type="text/javascript",b.getElementsByTagName("head")[0].appendChild(c)}var f,g;c.supports={simple:d("simple"),flag:d("flag"),unicode8:d("unicode8")},c.DOMReady=!1,c.readyCallback=function(){c.DOMReady=!0},c.supports.simple&&c.supports.flag&&c.supports.unicode8\|\|(g=function(){c.readyCallback()},b.addEventListener?(b.addEventListener("DOMContentLoaded",g,!1),a.addEventListener("load",g,!1)):(a.attachEvent("onload",g),b.attachEvent("onreadystatechange",function(){"complete"===b.readyState&&c.readyCallback()})),f=c.source\|\|{},f.concatemoji?e(f.concatemoji):f.wpemoji&&f.twemoji&&(e(f.twemoji),e(f.wpemoji)))}(window,document,window._wpemojiSettings);
4576	</script>
4577	<?php
4578	}
4579	}
4580
4581	/**
4582	* Convert any 4 byte emoji in a string to their equivalent HTML entity.
4583	*
4584	* Currently, only Unicode 7 emoji are supported. Skin tone modifiers are allowed,
4585	* all other Unicode 8 emoji will be added when the spec is finalised.
4586	*
4587	* This allows us to store emoji in a DB using the utf8 character set.
4588	*
4589	* @since 4.2.0
4590	*
4591	* @param string $content The content to encode.
4592	* @return string The encoded content.
4593	*/
4594	function wp_encode_emoji( $content ) {
4595	if ( function_exists( 'mb_convert_encoding' ) ) {
4596	$regex = '/(
4597	\x23\xE2\x83\xA3 # Digits
4598	[\x30-\x39]\xE2\x83\xA3
4599	\| \xF0\x9F[\x85-\x88][\xA6-\xBF] # Enclosed characters
4600	\| \xF0\x9F[\x8C-\x97][\x80-\xBF] # Misc
4601	\| \xF0\x9F\x98[\x80-\xBF] # Smilies
4602	\| \xF0\x9F\x99[\x80-\x8F]
4603	\| \xF0\x9F\x9A[\x80-\xBF] # Transport and map symbols
4604	)/x';
4605
4606	$matches = array();
4607	if ( preg_match_all( $regex, $content, $matches ) ) {
4608	if ( ! empty( $matches[1] ) ) {
4609	foreach ( $matches[1] as $emoji ) {
4610	/*
4611	* UTF-32's hex encoding is the same as HTML's hex encoding.
4612	* So, by converting the emoji from UTF-8 to UTF-32, we magically
4613	* get the correct hex encoding.
4614	*/
4615	$unpacked = unpack( 'H*', mb_convert_encoding( $emoji, 'UTF-32', 'UTF-8' ) );
4616	if ( isset( $unpacked[1] ) ) {
4617	$entity = '&#x' . ltrim( $unpacked[1], '0' ) . ';';
4618	$content = str_replace( $emoji, $entity, $content );
4619	}
4620	}
4621	}
4622	}
4623	}
4624
4625	return $content;
4626	}
4627
4628	/**
4629	* Convert emoji to a static img element.
4630	*
4631	* @since 4.2.0
4632	*
4633	* @param string $text The content to encode.
4634	* @return string The encoded content.
4635	*/
4636	function wp_staticize_emoji( $text ) {
4637	$text = wp_encode_emoji( $text );
4638
4639	/** This filter is documented in wp-includes/formatting.php */
4640	$cdn_url = apply_filters( 'emoji_url', set_url_scheme( '//s.w.org/images/core/emoji/72x72/' ) );
4641
4642	/** This filter is documented in wp-includes/formatting.php */
4643	$ext = apply_filters( 'emoji_ext', '.png' );
4644
4645	$output = '';
4646	/*
4647	* HTML loop taken from smiley function, which was taken from texturize function.
4648	* It'll never be consolidated.
4649	*
4650	* First, capture the tags as well as in between.
4651	*/
4652	$textarr = preg_split( '/(<.*>)/U', $text, -1, PREG_SPLIT_DELIM_CAPTURE );
4653	$stop = count( $textarr );
4654
4655	// Ignore processing of specific tags.
4656	$tags_to_ignore = 'code\|pre\|style\|script\|textarea';
4657	$ignore_block_element = '';
4658
4659	for ( $i = 0; $i < $stop; $i++ ) {
4660	$content = $textarr[$i];
4661
4662	// If we're in an ignore block, wait until we find its closing tag.
4663	if ( '' == $ignore_block_element && preg_match( '/^<(' . $tags_to_ignore . ')>/', $content, $matches ) ) {
4664	$ignore_block_element = $matches[1];
4665	}
4666
4667	// If it's not a tag and not in ignore block.
4668	if ( '' == $ignore_block_element && strlen( $content ) > 0 && '<' != $content[0] ) {
4669	$matches = array();
4670	if ( preg_match_all( '/(&#x1f1(e[6-9a-f]\|f[0-9a-f]);){2}/', $content, $matches ) ) {
4671	if ( ! empty( $matches[0] ) ) {
4672	foreach ( $matches[0] as $flag ) {
4673	$chars = str_replace( array( '&#x', ';'), '', $flag );
4674
4675	list( $char1, $char2 ) = str_split( $chars, 5 );
4676	$entity = sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', $cdn_url . $char1 . '-' . $char2 . $ext, html_entity_decode( $flag ) );
4677
4678	$content = str_replace( $flag, $entity, $content );
4679	}
4680	}
4681	}
4682
4683	// Loosely match the Emoji Unicode range.
4684	$regex = '/(&#x[2-3][0-9a-f]{3};\|&#x1f[1-6][0-9a-f]{2};)/';
4685
4686	$matches = array();
4687	if ( preg_match_all( $regex, $content, $matches ) ) {
4688	if ( ! empty( $matches[1] ) ) {
4689	foreach ( $matches[1] as $emoji ) {
4690	$char = str_replace( array( '&#x', ';'), '', $emoji );
4691	$entity = sprintf( '<img src="%s" alt="%s" class="wp-smiley" style="height: 1em; max-height: 1em;" />', $cdn_url . $char . $ext, html_entity_decode( $emoji ) );
4692
4693	$content = str_replace( $emoji, $entity, $content );
4694	}
4695	}
4696	}
4697	}
4698
4699	// Did we exit ignore block.
4700	if ( '' != $ignore_block_element && '</' . $ignore_block_element . '>' == $content ) {
4701	$ignore_block_element = '';
4702	}
4703
4704	$output .= $content;
4705	}
4706
4707	return $output;
4708	}
4709
4710	/**
4711	* Convert emoji in emails into static images.
4712	*
4713	* @since 4.2.0
4714	*
4715	* @param array $mail The email data array.
4716	* @return array The email data array, with emoji in the message staticized.
4717	*/
4718	function wp_staticize_emoji_for_email( $mail ) {
4719	if ( ! isset( $mail['message'] ) ) {
4720	return $mail;
4721	}
4722
4723	/*
4724	* We can only transform the emoji into images if it's a text/html email.
4725	* To do that, here's a cut down version of the same process that happens
4726	* in wp_mail() - get the Content-Type from the headers, if there is one,
4727	* then pass it through the wp_mail_content_type filter, in case a plugin
4728	* is handling changing the Content-Type.
4729	*/
4730	$headers = array();
4731	if ( isset( $mail['headers'] ) ) {
4732	if ( is_array( $mail['headers'] ) ) {
4733	$headers = $mail['headers'];
4734	} else {
4735	$headers = explode( "\n", str_replace( "\r\n", "\n", $mail['headers'] ) );
4736	}
4737	}
4738
4739	foreach ( $headers as $header ) {
4740	if ( strpos($header, ':') === false ) {
4741	continue;
4742	}
4743
4744	// Explode them out.
4745	list( $name, $content ) = explode( ':', trim( $header ), 2 );
4746
4747	// Cleanup crew.
4748	$name = trim( $name );
4749	$content = trim( $content );
4750
4751	if ( 'content-type' === strtolower( $name ) ) {
4752	if ( strpos( $content, ';' ) !== false ) {
4753	list( $type, $charset ) = explode( ';', $content );
4754	$content_type = trim( $type );
4755	} else {
4756	$content_type = trim( $content );
4757	}
4758	break;
4759	}
4760	}
4761
4762	// Set Content-Type if we don't have a content-type from the input headers.
4763	if ( ! isset( $content_type ) ) {
4764	$content_type = 'text/plain';
4765	}
4766
4767	/** This filter is documented in wp-includes/pluggable.php */
4768	$content_type = apply_filters( 'wp_mail_content_type', $content_type );
4769
4770	if ( 'text/html' === $content_type ) {
4771	$mail['message'] = wp_staticize_emoji( $mail['message'] );
4772	}
4773
4774	return $mail;
4775	}
4776
4777	/**
4778	* Shorten an URL, to be used as link text.
4779	*
4780	* @since 1.2.0
4781	* @since 4.4.0 Moved to wp-includes/formatting.php from wp-admin/includes/misc.php and added $length param.
4782	*
4783	* @param string $url URL to shorten.
4784	* @param int $length Optional. Maximum length of the shortened URL. Default 35 characters.
4785	* @return string Shortened URL.
4786	*/
4787	function url_shorten( $url, $length = 35 ) {
4788	$stripped = str_replace( array( 'https://', 'http://', 'www.' ), '', $url );
4789	$short_url = untrailingslashit( $stripped );
4790
4791	if ( strlen( $short_url ) > $length ) {
4792	$short_url = substr( $short_url, 0, $length - 3 ) . '…';
4793	}
4794	return $short_url;
4795	}

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Ticket #35201: formatting.php

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