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comment.php

Timestamp:

08/26/2015 04:26:29 AM (9 years ago)

Author:

wonderboymusic

Message:

Comments: move WP_Comment_Query into its own file. comment.php loads the new files, so this is 100% BC if someone is loading comment.php directly. New files created using svn cp.

Creates:
class-wp-comment-query.php
comment-functions.php

comment.php contains only top-level code. Class file only contains the class. Functions file only contains functions.

See #33413.

File:

: 1 edited

trunk/src/wp-includes/comment.php (modified) (1 diff)

Legend:

: Unmodified
: Added
: Removed

trunk/src/wp-includes/comment.php

-                      r33734
+                      r33750
  */
+/**
+ * Check whether a comment passes internal checks to be allowed to add.
+ *
+ * If manual comment moderation is set in the administration, then all checks,
+ * regardless of their type and whitelist, will fail and the function will
+ * return false.
+ *
+ * If the number of links exceeds the amount in the administration, then the
+ * check fails. If any of the parameter contents match the blacklist of words,
+ * then the check fails.
+ *
+ * If the comment author was approved before, then the comment is automatically
+ * whitelisted.
+ *
+ * If all checks pass, the function will return true.
+ *
+ * @since 1.2.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $author       Comment author name.
+ * @param string $email        Comment author email.
+ * @param string $url          Comment author URL.
+ * @param string $comment      Content of the comment.
+ * @param string $user_ip      Comment author IP address.
+ * @param string $user_agent   Comment author User-Agent.
+ * @param string $comment_type Comment type, either user-submitted comment,
+ *                             trackback, or pingback.
+ * @return bool If all checks pass, true, otherwise false.
+ */
+function check_comment($author, $email, $url, $comment, $user_ip, $user_agent, $comment_type) {
+    global $wpdb;
+    // If manual moderation is enabled, skip all checks and return false.
+    if ( 1 == get_option('comment_moderation') )
+        return false;
+    /** This filter is documented in wp-includes/comment-template.php */
+    $comment = apply_filters( 'comment_text', $comment );
+    // Check for the number of external links if a max allowed number is set.
+    if ( $max_links = get_option( 'comment_max_links' ) ) {
+        $num_links = preg_match_all( '/<a [^>]*href/i', $comment, $out );
+        /**
+         * Filter the maximum number of links allowed in a comment.
+         *
+         * @since 3.0.0
+         *
+         * @param int    $num_links The number of links allowed.
+         * @param string $url       Comment author's URL. Included in allowed links total.
+         */
+        $num_links = apply_filters( 'comment_max_links_url', $num_links, $url );
+        /*
+         * If the number of links in the comment exceeds the allowed amount,
+         * fail the check by returning false.
+         */
+        if ( $num_links >= $max_links )
+            return false;
+    }
+    $mod_keys = trim(get_option('moderation_keys'));
+    // If moderation 'keys' (keywords) are set, process them.
+    if ( !empty($mod_keys) ) {
+        $words = explode("\n", $mod_keys );
+        foreach ( (array) $words as $word) {
+            $word = trim($word);
+            // Skip empty lines.
+            if ( empty($word) )
+                continue;
+            /*
+             * Do some escaping magic so that '#' (number of) characters in the spam
+             * words don't break things:
+             */
+            $word = preg_quote($word, '#');
+            /*
+             * Check the comment fields for moderation keywords. If any are found,
+             * fail the check for the given field by returning false.
+             */
+            $pattern = "#$word#i";
+            if ( preg_match($pattern, $author) ) return false;
+            if ( preg_match($pattern, $email) ) return false;
+            if ( preg_match($pattern, $url) ) return false;
+            if ( preg_match($pattern, $comment) ) return false;
+            if ( preg_match($pattern, $user_ip) ) return false;
+            if ( preg_match($pattern, $user_agent) ) return false;
+        }
+    }
+    /*
+     * Check if the option to approve comments by previously-approved authors is enabled.
+     *
+     * If it is enabled, check whether the comment author has a previously-approved comment,
+     * as well as whether there are any moderation keywords (if set) present in the author
+     * email address. If both checks pass, return true. Otherwise, return false.
+     */
+    if ( 1 == get_option('comment_whitelist')) {
+        if ( 'trackback' != $comment_type && 'pingback' != $comment_type && $author != '' && $email != '' ) {
+            // expected_slashed ($author, $email)
+            $ok_to_comment = $wpdb->get_var("SELECT comment_approved FROM $wpdb->comments WHERE comment_author = '$author' AND comment_author_email = '$email' and comment_approved = '1' LIMIT 1");
+            if ( ( 1 == $ok_to_comment ) &&
+                ( empty($mod_keys) || false === strpos( $email, $mod_keys) ) )
+                    return true;
+            else
+                return false;
+        } else {
+            return false;
+        }
+    }
+    return true;
+}
+/**
+ * Retrieve the approved comments for post $post_id.
+ *
+ * @since 2.0.0
+ * @since 4.1.0 Refactored to leverage {@see WP_Comment_Query} over a direct query.
+ *
+ * @param  int   $post_id The ID of the post.
+ * @param  array $args    Optional. See {@see WP_Comment_Query::query()} for information
+ *                        on accepted arguments.
+ * @return int|array $comments The approved comments, or number of comments if `$count`
+ *                             argument is true.
+ */
+function get_approved_comments( $post_id, $args = array() ) {
+    if ( ! $post_id ) {
+        return array();
+    }
+    $defaults = array(
+        'status'  => 1,
+        'post_id' => $post_id,
+        'order'   => 'ASC',
+    );
+    $r = wp_parse_args( $args, $defaults );
+    $query = new WP_Comment_Query;
+    return $query->query( $r );
+}
+/**
+ * Retrieves comment data given a comment ID or comment object.
+ *
+ * If an object is passed then the comment data will be cached and then returned
+ * after being passed through a filter. If the comment is empty, then the global
+ * comment variable will be used, if it is set.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb   $wpdb WordPress database abstraction object.
+ * @global object $comment
+ *
+ * @param object|string|int $comment Comment to retrieve.
+ * @param string $output Optional. OBJECT or ARRAY_A or ARRAY_N constants.
+ * @return object|array|null Depends on $output value.
+ */
+function get_comment(&$comment, $output = OBJECT) {
+    global $wpdb;
+    if ( empty($comment) ) {
+        if ( isset($GLOBALS['comment']) )
+            $_comment = & $GLOBALS['comment'];
+        else
+            $_comment = null;
+    } elseif ( is_object($comment) ) {
+        wp_cache_add($comment->comment_ID, $comment, 'comment');
+        $_comment = $comment;
+    } else {
+        if ( isset($GLOBALS['comment']) && ($GLOBALS['comment']->comment_ID == $comment) ) {
+            $_comment = & $GLOBALS['comment'];
+        } elseif ( ! $_comment = wp_cache_get($comment, 'comment') ) {
+            $_comment = $wpdb->get_row($wpdb->prepare("SELECT * FROM $wpdb->comments WHERE comment_ID = %d LIMIT 1", $comment));
+            if ( ! $_comment )
+                return null;
+            wp_cache_add($_comment->comment_ID, $_comment, 'comment');
+        }
+    }
+    /**
+     * Fires after a comment is retrieved.
+     *
+     * @since 2.3.0
+     *
+     * @param mixed $_comment Comment data.
+     */
+    $_comment = apply_filters( 'get_comment', $_comment );
+    if ( $output == OBJECT ) {
+        return $_comment;
+    } elseif ( $output == ARRAY_A ) {
+        $__comment = get_object_vars($_comment);
+        return $__comment;
+    } elseif ( $output == ARRAY_N ) {
+        $__comment = array_values(get_object_vars($_comment));
+        return $__comment;
+    } else {
+        return $_comment;
+    }
+}
+/**
+ * Retrieve a list of comments.
+ *
+ * The comment list can be for the blog as a whole or for an individual post.
+ *
+ * @since 2.7.0
+ *
+ * @param string|array $args Optional. Array or string of arguments. See {@see WP_Comment_Query::parse_query()}
+ *                           for information on accepted arguments. Default empty.
+ * @return int|array List of comments or number of found comments if `$count` argument is true.
+ */
+function get_comments( $args = '' ) {
+    $query = new WP_Comment_Query;
+    return $query->query( $args );
+}
+/**
+ * WordPress Comment Query class.
+ *
+ * See WP_Comment_Query::__construct() for accepted arguments.
+ *
+ * @since 3.1.0
+ */
+class WP_Comment_Query {
+    /**
+     * SQL for database query.
+     *
+     * @since 4.0.1
+     * @access public
+     * @var string
+     */
+    public $request;
+    /**
+     * Metadata query container
+     *
+     * @since 3.5.0
+     * @access public
+     * @var object WP_Meta_Query
+     */
+    public $meta_query = false;
+    /**
+     * Date query container
+     *
+     * @since 3.7.0
+     * @access public
+     * @var object WP_Date_Query
+     */
+    public $date_query = false;
+    /**
+     * Query vars set by the user.
+     *
+     * @since 3.1.0
+     * @access public
+     * @var array
+     */
+    public $query_vars;
+    /**
+     * Default values for query vars.
+     *
+     * @since 4.2.0
+     * @access public
+     * @var array
+     */
+    public $query_var_defaults;
+    /**
+     * List of comments located by the query.
+     *
+     * @since 4.0.0
+     * @access public
+     * @var array
+     */
+    public $comments;
+    /**
+     * Make private/protected methods readable for backwards compatibility.
+     *
+     * @since 4.0.0
+     * @access public
+     *
+     * @param callable $name      Method to call.
+     * @param array    $arguments Arguments to pass when calling.
+     * @return mixed|false Return value of the callback, false otherwise.
+     */
+    public function __call( $name, $arguments ) {
+        if ( 'get_search_sql' === $name ) {
+            return call_user_func_array( array( $this, $name ), $arguments );
+        }
+        return false;
+    }
+    /**
+     * Constructor.
+     *
+     * Sets up the comment query, based on the query vars passed.
+     *
+     * @since  4.2.0
+     * @access public
+     *
+     * @param string|array $query {
+     *     Optional. Array or query string of comment query parameters. Default empty.
+     *
+     *     @type string       $author_email        Comment author email address. Default empty.
+     *     @type array        $author__in          Array of author IDs to include comments for. Default empty.
+     *     @type array        $author__not_in      Array of author IDs to exclude comments for. Default empty.
+     *     @type array        $comment__in         Array of comment IDs to include. Default empty.
+     *     @type array        $comment__not_in     Array of comment IDs to exclude. Default empty.
+     *     @type bool         $count               Whether to return a comment count (true) or array of comment
+     *                                             objects (false). Default false.
+     *     @type array        $date_query          Date query clauses to limit comments by. See WP_Date_Query.
+     *                                             Default null.
+     *     @type string       $fields              Comment fields to return. Accepts 'ids' for comment IDs only or
+     *                                             empty for all fields. Default empty.
+     *     @type int          $ID                  Currently unused.
+     *     @type array        $include_unapproved  Array of IDs or email addresses of users whose unapproved comments
+     *                                             will be returned by the query regardless of `$status`. Default empty.
+     *     @type int          $karma               Karma score to retrieve matching comments for. Default empty.
+     *     @type string       $meta_key            Include comments with a matching comment meta key. Default empty.
+     *     @type string       $meta_value          Include comments with a matching comment meta value. Requires
+     *                                             `$meta_key` to be set. Default empty.
+     *     @type array        $meta_query          Meta query clauses to limit retrieved comments by.
+     *                                             See WP_Meta_Query. Default empty.
+     *     @type int          $number              Maximum number of comments to retrieve. Default null (no limit).
+     *     @type int          $offset              Number of comments to offset the query. Used to build LIMIT clause.
+     *                                             Default 0.
+     *     @type string|array $orderby             Comment status or array of statuses. To use 'meta_value' or
+     *                                             'meta_value_num', `$meta_key` must also be defined. To sort by
+     *                                             a specific `$meta_query` clause, use that clause's array key.
+     *                                             Accepts 'comment_agent', 'comment_approved', 'comment_author',
+     *                                             'comment_author_email', 'comment_author_IP',
+     *                                             'comment_author_url', 'comment_content', 'comment_date',
+     *                                             'comment_date_gmt', 'comment_ID', 'comment_karma',
+     *                                             'comment_parent', 'comment_post_ID', 'comment_type', 'user_id',
+     *                                             'meta_value', 'meta_value_num', the value of $meta_key, and the
+     *                                             array keys of `$meta_query`. Also accepts false, an empty array,
+     *                                             or 'none' to disable `ORDER BY` clause.
+     *                                             Default: 'comment_date_gmt'.
+     *     @type string       $order               How to order retrieved comments. Accepts 'ASC', 'DESC'.
+     *                                             Default: 'DESC'.
+     *     @type int          $parent              Parent ID of comment to retrieve children of. Default empty.
+     *     @type array        $post_author__in     Array of author IDs to retrieve comments for. Default empty.
+     *     @type array        $post_author__not_in Array of author IDs *not* to retrieve comments for. Default empty.
+     *     @type int          $post_ID             Currently unused.
+     *     @type int          $post_id             Limit results to those affiliated with a given post ID. Default 0.
+     *     @type array        $post__in            Array of post IDs to include affiliated comments for. Default empty.
+     *     @type array        $post__not_in        Array of post IDs to exclude affiliated comments for. Default empty.
+     *     @type int          $post_author         Comment author ID to limit results by. Default empty.
+     *     @type string       $post_status         Post status to retrieve affiliated comments for. Default empty.
+     *     @type string       $post_type           Post type to retrieve affiliated comments for. Default empty.
+     *     @type string       $post_name           Post name to retrieve affiliated comments for. Default empty.
+     *     @type int          $post_parent         Post parent ID to retrieve affiliated comments for. Default empty.
+     *     @type string       $search              Search term(s) to retrieve matching comments for. Default empty.
+     *     @type string       $status              Comment status to limit results by. Accepts 'hold'
+     *                                             (`comment_status=0`), 'approve' (`comment_status=1`), 'all', or a
+     *                                             custom comment status. Default 'all'.
+     *     @type string|array $type                Include comments of a given type, or array of types. Accepts
+     *                                             'comment', 'pings' (includes 'pingback' and 'trackback'), or any
+     *                                             custom type string. Default empty.
+     *     @type array        $type__in            Include comments from a given array of comment types. Default empty.
+     *     @type array        $type__not_in        Exclude comments from a given array of comment types. Default empty.
+     *     @type int          $user_id             Include comments for a specific user ID. Default empty.
+     * }
+     */
+    public function __construct( $query = '' ) {
+        $this->query_var_defaults = array(
+            'author_email' => '',
+            'author__in' => '',
+            'author__not_in' => '',
+            'include_unapproved' => '',
+            'fields' => '',
+            'ID' => '',
+            'comment__in' => '',
+            'comment__not_in' => '',
+            'karma' => '',
+            'number' => '',
+            'offset' => '',
+            'orderby' => '',
+            'order' => 'DESC',
+            'parent' => '',
+            'post_author__in' => '',
+            'post_author__not_in' => '',
+            'post_ID' => '',
+            'post_id' => 0,
+            'post__in' => '',
+            'post__not_in' => '',
+            'post_author' => '',
+            'post_name' => '',
+            'post_parent' => '',
+            'post_status' => '',
+            'post_type' => '',
+            'status' => 'all',
+            'type' => '',
+            'type__in' => '',
+            'type__not_in' => '',
+            'user_id' => '',
+            'search' => '',
+            'count' => false,
+            'meta_key' => '',
+            'meta_value' => '',
+            'meta_query' => '',
+            'date_query' => null, // See WP_Date_Query
+        );
+        if ( ! empty( $query ) ) {
+            $this->query( $query );
+        }
+    }
+    /**
+     * Parse arguments passed to the comment query with default query parameters.
+     *
+     * @since  4.2.0 Extracted from WP_Comment_Query::query().
+     *
+     * @access public
+     *
+     * @param string|array $query WP_Comment_Query arguments. See WP_Comment_Query::__construct()
+     */
+    public function parse_query( $query = '' ) {
+        if ( empty( $query ) ) {
+            $query = $this->query_vars;
+        }
+        $this->query_vars = wp_parse_args( $query, $this->query_var_defaults );
+        do_action_ref_array( 'parse_comment_query', array( &$this ) );
+    }
+    /**
+     * Sets up the WordPress query for retrieving comments.
+     *
+     * @since 3.1.0
+     * @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in',
+     *              'post_author__not_in', 'author__in', 'author__not_in', 'post__in',
+     *              'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in'
+     *              arguments to $query_vars.
+     * @since 4.2.0 Moved parsing to WP_Comment_Query::parse_query().
+     * @access public
+     *
+     * @param string|array $query Array or URL query string of parameters.
+     * @return array|int List of comments, or number of comments when 'count' is passed as a query var.
+     */
+    public function query( $query ) {
+        $this->query_vars = wp_parse_args( $query );
+        return $this->get_comments();
+    }
+    /**
+     * Get a list of comments matching the query vars.
+     *
+     * @since 4.2.0
+     * @access public
+     *
+     * @global wpdb $wpdb WordPress database abstraction object.
+     *
+     * @return int|array The list of comments.
+     */
+    public function get_comments() {
+        global $wpdb;
+        $groupby = '';
+        $this->parse_query();
+        // Parse meta query
+        $this->meta_query = new WP_Meta_Query();
+        $this->meta_query->parse_query_vars( $this->query_vars );
+        /**
+         * Fires before comments are retrieved.
+         *
+         * @since 3.1.0
+         *
+         * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference.
+         */
+        do_action_ref_array( 'pre_get_comments', array( &$this ) );
+        // Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
+        $this->meta_query->parse_query_vars( $this->query_vars );
+        if ( ! empty( $this->meta_query->queries ) ) {
+            $meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
+        }
+        // $args can include anything. Only use the args defined in the query_var_defaults to compute the key.
+        $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
+        $last_changed = wp_cache_get( 'last_changed', 'comment' );
+        if ( ! $last_changed ) {
+            $last_changed = microtime();
+            wp_cache_set( 'last_changed', $last_changed, 'comment' );
+        }
+        $cache_key = "get_comments:$key:$last_changed";
+        if ( $cache = wp_cache_get( $cache_key, 'comment' ) ) {
+            $this->comments = $cache;
+            return $this->comments;
+        }
+        $where = array();
+        // Assemble clauses related to 'comment_approved'.
+        $approved_clauses = array();
+        // 'status' accepts an array or a comma-separated string.
+        $status_clauses = array();
+        $statuses = $this->query_vars['status'];
+        if ( ! is_array( $statuses ) ) {
+            $statuses = preg_split( '/[\s,]+/', $statuses );
+        }
+        // 'any' overrides other statuses.
+        if ( ! in_array( 'any', $statuses ) ) {
+            foreach ( $statuses as $status ) {
+                switch ( $status ) {
+                    case 'hold' :
+                        $status_clauses[] = "comment_approved = '0'";
+                        break;
+                    case 'approve' :
+                        $status_clauses[] = "comment_approved = '1'";
+                        break;
+                    case 'all' :
+                    case '' :
+                        $status_clauses[] = "( comment_approved = '0' OR comment_approved = '1' )";
+                        break;
+                    default :
+                        $status_clauses[] = $wpdb->prepare( "comment_approved = %s", $status );
+                        break;
+                }
+            }
+            if ( ! empty( $status_clauses ) ) {
+                $approved_clauses[] = '( ' . implode( ' OR ', $status_clauses ) . ' )';
+            }
+        }
+        // User IDs or emails whose unapproved comments are included, regardless of $status.
+        if ( ! empty( $this->query_vars['include_unapproved'] ) ) {
+            $include_unapproved = $this->query_vars['include_unapproved'];
+            // Accepts arrays or comma-separated strings.
+            if ( ! is_array( $include_unapproved ) ) {
+                $include_unapproved = preg_split( '/[\s,]+/', $include_unapproved );
+            }
+            $unapproved_ids = $unapproved_emails = array();
+            foreach ( $include_unapproved as $unapproved_identifier ) {
+                // Numeric values are assumed to be user ids.
+                if ( is_numeric( $unapproved_identifier ) ) {
+                    $approved_clauses[] = $wpdb->prepare( "( user_id = %d AND comment_approved = '0' )", $unapproved_identifier );
+                // Otherwise we match against email addresses.
+                } else {
+                    $approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' )", $unapproved_identifier );
+                }
+            }
+        }
+        // Collapse comment_approved clauses into a single OR-separated clause.
+        if ( ! empty( $approved_clauses ) ) {
+            if ( 1 === count( $approved_clauses ) ) {
+                $where[] = $approved_clauses[0];
+            } else {
+                $where[] = '( ' . implode( ' OR ', $approved_clauses ) . ' )';
+            }
+        }
+        $order = ( 'ASC' == strtoupper( $this->query_vars['order'] ) ) ? 'ASC' : 'DESC';
+        // Disable ORDER BY with 'none', an empty array, or boolean false.
+        if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {
+            $orderby = '';
+        } elseif ( ! empty( $this->query_vars['orderby'] ) ) {
+            $ordersby = is_array( $this->query_vars['orderby'] ) ?
+                $this->query_vars['orderby'] :
+                preg_split( '/[,\s]/', $this->query_vars['orderby'] );
+            $orderby_array = array();
+            $found_orderby_comment_ID = false;
+            foreach ( $ordersby as $_key => $_value ) {
+                if ( ! $_value ) {
+                    continue;
+                }
+                if ( is_int( $_key ) ) {
+                    $_orderby = $_value;
+                    $_order = $order;
+                } else {
+                    $_orderby = $_key;
+                    $_order = $_value;
+                }
+                if ( ! $found_orderby_comment_ID && 'comment_ID' === $_orderby ) {
+                    $found_orderby_comment_ID = true;
+                }
+                $parsed = $this->parse_orderby( $_orderby );
+                if ( ! $parsed ) {
+                    continue;
+                }
+                $orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
+            }
+            // If no valid clauses were found, order by comment_date_gmt.
+            if ( empty( $orderby_array ) ) {
+                $orderby_array[] = "$wpdb->comments.comment_date_gmt $order";
+            }
+            // To ensure determinate sorting, always include a comment_ID clause.
+            if ( ! $found_orderby_comment_ID ) {
+                $comment_ID_order = '';
+                // Inherit order from comment_date or comment_date_gmt, if available.
+                foreach ( $orderby_array as $orderby_clause ) {
+                    if ( preg_match( '/comment_date(?:_gmt)*\ (ASC|DESC)/', $orderby_clause, $match ) ) {
+                        $comment_ID_order = $match[1];
+                        break;
+                    }
+                }
+                // If no date-related order is available, use the date from the first available clause.
+                if ( ! $comment_ID_order ) {
+                    foreach ( $orderby_array as $orderby_clause ) {
+                        if ( false !== strpos( 'ASC', $orderby_clause ) ) {
+                            $comment_ID_order = 'ASC';
+                        } else {
+                            $comment_ID_order = 'DESC';
+                        }
+                        break;
+                    }
+                }
+                // Default to DESC.
+                if ( ! $comment_ID_order ) {
+                    $comment_ID_order = 'DESC';
+                }
+                $orderby_array[] = "$wpdb->comments.comment_ID $comment_ID_order";
+            }
+            $orderby = implode( ', ', $orderby_array );
+        } else {
+            $orderby = "$wpdb->comments.comment_date_gmt $order";
+        }
+        $number = absint( $this->query_vars['number'] );
+        $offset = absint( $this->query_vars['offset'] );
+        if ( ! empty( $number ) ) {
+            if ( $offset ) {
+                $limits = 'LIMIT ' . $offset . ',' . $number;
+            } else {
+                $limits = 'LIMIT ' . $number;
+            }
+        } else {
+            $limits = '';
+        }
+        if ( $this->query_vars['count'] ) {
+            $fields = 'COUNT(*)';
+        } else {
+            switch ( strtolower( $this->query_vars['fields'] ) ) {
+                case 'ids':
+                    $fields = "$wpdb->comments.comment_ID";
+                    break;
+                default:
+                    $fields = "*";
+                    break;
+            }
+        }
+        $join = '';
+        $post_id = absint( $this->query_vars['post_id'] );
+        if ( ! empty( $post_id ) ) {
+            $where[] = $wpdb->prepare( 'comment_post_ID = %d', $post_id );
+        }
+        // Parse comment IDs for an IN clause.
+        if ( ! empty( $this->query_vars['comment__in'] ) ) {
+            $where[] = "$wpdb->comments.comment_ID IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__in'] ) ) . ' )';
+        }
+        // Parse comment IDs for a NOT IN clause.
+        if ( ! empty( $this->query_vars['comment__not_in'] ) ) {
+            $where[] = "$wpdb->comments.comment_ID NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__not_in'] ) ) . ' )';
+        }
+        // Parse comment post IDs for an IN clause.
+        if ( ! empty( $this->query_vars['post__in'] ) ) {
+            $where[] = 'comment_post_ID IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__in'] ) ) . ' )';
+        }
+        // Parse comment post IDs for a NOT IN clause.
+        if ( ! empty( $this->query_vars['post__not_in'] ) ) {
+            $where[] = 'comment_post_ID NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__not_in'] ) ) . ' )';
+        }
+        if ( '' !== $this->query_vars['author_email'] ) {
+            $where[] = $wpdb->prepare( 'comment_author_email = %s', $this->query_vars['author_email'] );
+        }
+        if ( '' !== $this->query_vars['karma'] ) {
+            $where[] = $wpdb->prepare( 'comment_karma = %d', $this->query_vars['karma'] );
+        }
+        // Filtering by comment_type: 'type', 'type__in', 'type__not_in'.
+        $raw_types = array(
+            'IN' => array_merge( (array) $this->query_vars['type'], (array) $this->query_vars['type__in'] ),
+            'NOT IN' => (array) $this->query_vars['type__not_in'],
+        );
+        $comment_types = array();
+        foreach ( $raw_types as $operator => $_raw_types ) {
+            $_raw_types = array_unique( $_raw_types );
+            foreach ( $_raw_types as $type ) {
+                switch ( $type ) {
+                    // An empty translates to 'all', for backward compatibility
+                    case '':
+                    case 'all' :
+                        break;
+                    case 'comment':
+                    case 'comments':
+                        $comment_types[ $operator ][] = "''";
+                        break;
+                    case 'pings':
+                        $comment_types[ $operator ][] = "'pingback'";
+                        $comment_types[ $operator ][] = "'trackback'";
+                        break;
+                    default:
+                        $comment_types[ $operator ][] = $wpdb->prepare( '%s', $type );
+                        break;
+                }
+            }
+            if ( ! empty( $comment_types[ $operator ] ) ) {
+                $types_sql = implode( ', ', $comment_types[ $operator ] );
+                $where[] = "comment_type $operator ($types_sql)";
+            }
+        }
+        if ( '' !== $this->query_vars['parent'] ) {
+            $where[] = $wpdb->prepare( 'comment_parent = %d', $this->query_vars['parent'] );
+        }
+        if ( is_array( $this->query_vars['user_id'] ) ) {
+            $where[] = 'user_id IN (' . implode( ',', array_map( 'absint', $this->query_vars['user_id'] ) ) . ')';
+        } elseif ( '' !== $this->query_vars['user_id'] ) {
+            $where[] = $wpdb->prepare( 'user_id = %d', $this->query_vars['user_id'] );
+        }
+        if ( '' !== $this->query_vars['search'] ) {
+            $search_sql = $this->get_search_sql(
+                $this->query_vars['search'],
+                array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' )
+            );
+            // Strip leading 'AND'.
+            $where[] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
+        }
+        // If any post-related query vars are passed, join the posts table.
+        $join_posts_table = false;
+        $plucked = wp_array_slice_assoc( $this->query_vars, array( 'post_author', 'post_name', 'post_parent', 'post_status', 'post_type' ) );
+        $post_fields = array_filter( $plucked );
+        if ( ! empty( $post_fields ) ) {
+            $join_posts_table = true;
+            foreach ( $post_fields as $field_name => $field_value ) {
+                // $field_value may be an array.
+                $esses = array_fill( 0, count( (array) $field_value ), '%s' );
+                $where[] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
+            }
+        }
+        // Comment author IDs for an IN clause.
+        if ( ! empty( $this->query_vars['author__in'] ) ) {
+            $where[] = 'user_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__in'] ) ) . ' )';
+        }
+        // Comment author IDs for a NOT IN clause.
+        if ( ! empty( $this->query_vars['author__not_in'] ) ) {
+            $where[] = 'user_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__not_in'] ) ) . ' )';
+        }
+        // Post author IDs for an IN clause.
+        if ( ! empty( $this->query_vars['post_author__in'] ) ) {
+            $join_posts_table = true;
+            $where[] = 'post_author IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__in'] ) ) . ' )';
+        }
+        // Post author IDs for a NOT IN clause.
+        if ( ! empty( $this->query_vars['post_author__not_in'] ) ) {
+            $join_posts_table = true;
+            $where[] = 'post_author NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__not_in'] ) ) . ' )';
+        }
+        if ( $join_posts_table ) {
+            $join = "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
+        }
+        if ( ! empty( $meta_query_clauses ) ) {
+            $join .= $meta_query_clauses['join'];
+            // Strip leading 'AND'.
+            $where[] = preg_replace( '/^\s*AND\s*/', '', $meta_query_clauses['where'] );
+            if ( ! $this->query_vars['count'] ) {
+                $groupby = "{$wpdb->comments}.comment_ID";
+            }
+        }
+        $date_query = $this->query_vars['date_query'];
+        if ( ! empty( $date_query ) && is_array( $date_query ) ) {
+            $date_query_object = new WP_Date_Query( $date_query, 'comment_date' );
+            $where[] = preg_replace( '/^\s*AND\s*/', '', $date_query_object->get_sql() );
+        }
+        $where = implode( ' AND ', $where );
+        $pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );
+        /**
+         * Filter the comment query clauses.
+         *
+         * @since 3.1.0
+         *
+         * @param array            $pieces A compacted array of comment query clauses.
+         * @param WP_Comment_Query &$this  Current instance of WP_Comment_Query, passed by reference.
+         */
+        $clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) );
+        $fields = isset( $clauses[ 'fields' ] ) ? $clauses[ 'fields' ] : '';
+        $join = isset( $clauses[ 'join' ] ) ? $clauses[ 'join' ] : '';
+        $where = isset( $clauses[ 'where' ] ) ? $clauses[ 'where' ] : '';
+        $orderby = isset( $clauses[ 'orderby' ] ) ? $clauses[ 'orderby' ] : '';
+        $limits = isset( $clauses[ 'limits' ] ) ? $clauses[ 'limits' ] : '';
+        $groupby = isset( $clauses[ 'groupby' ] ) ? $clauses[ 'groupby' ] : '';
+        if ( $where ) {
+            $where = 'WHERE ' . $where;
+        }
+        if ( $groupby ) {
+            $groupby = 'GROUP BY ' . $groupby;
+        }
+        if ( $orderby ) {
+            $orderby = "ORDER BY $orderby";
+        }
+        $this->request = "SELECT $fields FROM $wpdb->comments $join $where $groupby $orderby $limits";
+        if ( $this->query_vars['count'] ) {
+            return $wpdb->get_var( $this->request );
+        }
+        if ( 'ids' == $this->query_vars['fields'] ) {
+            $this->comments = $wpdb->get_col( $this->request );
+            return array_map( 'intval', $this->comments );
+        }
+        $results = $wpdb->get_results( $this->request );
+        /**
+         * Filter the comment query results.
+         *
+         * @since 3.1.0
+         *
+         * @param array            $results  An array of comments.
+         * @param WP_Comment_Query &$this    Current instance of WP_Comment_Query, passed by reference.
+         */
+        $comments = apply_filters_ref_array( 'the_comments', array( $results, &$this ) );
+        wp_cache_add( $cache_key, $comments, 'comment' );
+        if ( '*' === $fields ) {
+            update_comment_cache( $comments );
+        }
+        $this->comments = $comments;
+        return $this->comments;
+    }
+    /**
+     * Used internally to generate an SQL string for searching across multiple columns
+     *
+     * @since 3.1.0
+     * @access protected
+     *
+     * @global wpdb $wpdb
+     *
+     * @param string $string
+     * @param array $cols
+     * @return string
+     */
+    protected function get_search_sql( $string, $cols ) {
+        global $wpdb;
+        $like = '%' . $wpdb->esc_like( $string ) . '%';
+        $searches = array();
+        foreach ( $cols as $col ) {
+            $searches[] = $wpdb->prepare( "$col LIKE %s", $like );
+        }
+        return ' AND (' . implode(' OR ', $searches) . ')';
+    }
+    /**
+     * Parse and sanitize 'orderby' keys passed to the comment query.
+     *
+     * @since 4.2.0
+     * @access protected
+     *
+     * @global wpdb $wpdb WordPress database abstraction object.
+     *
+     * @param string $orderby Alias for the field to order by.
+     * @return string|false Value to used in the ORDER clause. False otherwise.
+     */
+    protected function parse_orderby( $orderby ) {
+        global $wpdb;
+        $allowed_keys = array(
+            'comment_agent',
+            'comment_approved',
+            'comment_author',
+            'comment_author_email',
+            'comment_author_IP',
+            'comment_author_url',
+            'comment_content',
+            'comment_date',
+            'comment_date_gmt',
+            'comment_ID',
+            'comment_karma',
+            'comment_parent',
+            'comment_post_ID',
+            'comment_type',
+            'user_id',
+        );
+        if ( ! empty( $this->query_vars['meta_key'] ) ) {
+            $allowed_keys[] = $this->query_vars['meta_key'];
+            $allowed_keys[] = 'meta_value';
+            $allowed_keys[] = 'meta_value_num';
+        }
+        $meta_query_clauses = $this->meta_query->get_clauses();
+        if ( $meta_query_clauses ) {
+            $allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
+        }
+        $parsed = false;
+        if ( $orderby == $this->query_vars['meta_key'] || $orderby == 'meta_value' ) {
+            $parsed = "$wpdb->commentmeta.meta_value";
+        } elseif ( $orderby == 'meta_value_num' ) {
+            $parsed = "$wpdb->commentmeta.meta_value+0";
+        } elseif ( in_array( $orderby, $allowed_keys ) ) {
+            if ( isset( $meta_query_clauses[ $orderby ] ) ) {
+                $meta_clause = $meta_query_clauses[ $orderby ];
+                $parsed = sprintf( "CAST(%s.meta_value AS %s)", esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
+            } else {
+                $parsed = "$wpdb->comments.$orderby";
+            }
+        }
+        return $parsed;
+    }
+    /**
+     * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
+     *
+     * @since 4.2.0
+     * @access protected
+     *
+     * @param string $order The 'order' query variable.
+     * @return string The sanitized 'order' query variable.
+     */
+    protected function parse_order( $order ) {
+        if ( ! is_string( $order ) || empty( $order ) ) {
+            return 'DESC';
+        }
+        if ( 'ASC' === strtoupper( $order ) ) {
+            return 'ASC';
+        } else {
+            return 'DESC';
+        }
+    }
+}
+/**
+ * Retrieve all of the WordPress supported comment statuses.
+ *
+ * Comments have a limited set of valid status values, this provides the comment
+ * status values and descriptions.
+ *
+ * @since 2.7.0
+ *
+ * @return array List of comment statuses.
+ */
+function get_comment_statuses() {
+    $status = array(
+        'hold'      => __('Unapproved'),
+        /* translators: comment status  */
+        'approve'   => _x('Approved', 'adjective'),
+        /* translators: comment status */
+        'spam'      => _x('Spam', 'adjective'),
+    );
+    return $status;
+}
+/**
+ * Gets the default comment status for a post type.
+ *
+ * @since 4.3.0
+ *
+ * @param string $post_type    Optional. Post type. Default 'post'.
+ * @param string $comment_type Optional. Comment type. Default 'comment'.
+ * @return string Expected return value is 'open' or 'closed'.
+ */
+function get_default_comment_status( $post_type = 'post', $comment_type = 'comment' ) {
+    switch ( $comment_type ) {
+        case 'pingback' :
+        case 'trackback' :
+            $supports = 'trackbacks';
+            $option = 'ping';
+            break;
+        default :
+            $supports = 'comments';
+            $option = 'comment';
+    }
+    // Set the status.
+    if ( 'page' === $post_type ) {
+        $status = 'closed';
+    } elseif ( post_type_supports( $post_type, $supports ) ) {
+        $status = get_option( "default_{$option}_status" );
+    } else {
+        $status = 'closed';
+    }
+    /**
+     * Filter the default comment status for the given post type.
+     *
+     * @since 4.3.0
+     *
+     * @param string $status       Default status for the given post type,
+     *                             either 'open' or 'closed'.
+     * @param string $post_type    Post type. Default is `post`.
+     * @param string $comment_type Type of comment. Default is `comment`.
+     */
+    return apply_filters( 'get_default_comment_status' , $status, $post_type, $comment_type );
+}
+/**
+ * The date the last comment was modified.
+ *
+ * @since 1.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ * @staticvar array $cache_lastcommentmodified
+ *
+ * @param string $timezone Which timezone to use in reference to 'gmt', 'blog',
+ *      or 'server' locations.
+ * @return string Last comment modified date.
+ */
+function get_lastcommentmodified($timezone = 'server') {
+    global $wpdb;
+    static $cache_lastcommentmodified = array();
+    if ( isset($cache_lastcommentmodified[$timezone]) )
+        return $cache_lastcommentmodified[$timezone];
+    $add_seconds_server = date('Z');
+    switch ( strtolower($timezone)) {
+        case 'gmt':
+            $lastcommentmodified = $wpdb->get_var("SELECT comment_date_gmt FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
+            break;
+        case 'blog':
+            $lastcommentmodified = $wpdb->get_var("SELECT comment_date FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1");
+            break;
+        case 'server':
+            $lastcommentmodified = $wpdb->get_var($wpdb->prepare("SELECT DATE_ADD(comment_date_gmt, INTERVAL %s SECOND) FROM $wpdb->comments WHERE comment_approved = '1' ORDER BY comment_date_gmt DESC LIMIT 1", $add_seconds_server));
+            break;
+    }
+    $cache_lastcommentmodified[$timezone] = $lastcommentmodified;
+    return $lastcommentmodified;
+}
+/**
+ * The amount of comments in a post or total comments.
+ *
+ * A lot like {@link wp_count_comments()}, in that they both return comment
+ * stats (albeit with different types). The {@link wp_count_comments()} actual
+ * caches, but this function does not.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $post_id Optional. Comment amount in post if > 0, else total comments blog wide.
+ * @return array The amount of spam, approved, awaiting moderation, and total comments.
+ */
+function get_comment_count( $post_id = 0 ) {
+    global $wpdb;
+    $post_id = (int) $post_id;
+    $where = '';
+    if ( $post_id > 0 ) {
+        $where = $wpdb->prepare("WHERE comment_post_ID = %d", $post_id);
+    }
+    $totals = (array) $wpdb->get_results("
+        SELECT comment_approved, COUNT( * ) AS total
+        FROM {$wpdb->comments}
+        {$where}
+        GROUP BY comment_approved
+    ", ARRAY_A);
+    $comment_count = array(
+        "approved"              => 0,
+        "awaiting_moderation"   => 0,
+        "spam"                  => 0,
+        "total_comments"        => 0
+    );
+    foreach ( $totals as $row ) {
+        switch ( $row['comment_approved'] ) {
+            case 'spam':
+                $comment_count['spam'] = $row['total'];
+                $comment_count["total_comments"] += $row['total'];
+                break;
+            case 1:
+                $comment_count['approved'] = $row['total'];
+                $comment_count['total_comments'] += $row['total'];
+                break;
+            case 0:
+                $comment_count['awaiting_moderation'] = $row['total'];
+                $comment_count['total_comments'] += $row['total'];
+                break;
+            default:
+                break;
+        }
+    }
+    return $comment_count;
+}
+//
+// Comment meta functions
+//
+/**
+ * Add meta data field to a comment.
+ *
+ * @since 2.9.0
+ * @link https://codex.wordpress.org/Function_Reference/add_comment_meta
+ *
+ * @param int $comment_id Comment ID.
+ * @param string $meta_key Metadata name.
+ * @param mixed $meta_value Metadata value.
+ * @param bool $unique Optional, default is false. Whether the same key should not be added.
+ * @return int|bool Meta ID on success, false on failure.
+ */
+function add_comment_meta($comment_id, $meta_key, $meta_value, $unique = false) {
+    return add_metadata('comment', $comment_id, $meta_key, $meta_value, $unique);
+}
+/**
+ * Remove metadata matching criteria from a comment.
+ *
+ * You can match based on the key, or key and value. Removing based on key and
+ * value, will keep from removing duplicate metadata with the same key. It also
+ * allows removing all metadata matching key, if needed.
+ *
+ * @since 2.9.0
+ * @link https://codex.wordpress.org/Function_Reference/delete_comment_meta
+ *
+ * @param int $comment_id comment ID
+ * @param string $meta_key Metadata name.
+ * @param mixed $meta_value Optional. Metadata value.
+ * @return bool True on success, false on failure.
+ */
+function delete_comment_meta($comment_id, $meta_key, $meta_value = '') {
+    return delete_metadata('comment', $comment_id, $meta_key, $meta_value);
+}
+/**
+ * Retrieve comment meta field for a comment.
+ *
+ * @since 2.9.0
+ * @link https://codex.wordpress.org/Function_Reference/get_comment_meta
+ *
+ * @param int $comment_id Comment ID.
+ * @param string $key Optional. The meta key to retrieve. By default, returns data for all keys.
+ * @param bool $single Whether to return a single value.
+ * @return mixed Will be an array if $single is false. Will be value of meta data field if $single
+ *  is true.
+ */
+function get_comment_meta($comment_id, $key = '', $single = false) {
+    return get_metadata('comment', $comment_id, $key, $single);
+}
+/**
+ * Update comment meta field based on comment ID.
+ *
+ * Use the $prev_value parameter to differentiate between meta fields with the
+ * same key and comment ID.
+ *
+ * If the meta field for the comment does not exist, it will be added.
+ *
+ * @since 2.9.0
+ * @link https://codex.wordpress.org/Function_Reference/update_comment_meta
+ *
+ * @param int $comment_id Comment ID.
+ * @param string $meta_key Metadata key.
+ * @param mixed $meta_value Metadata value.
+ * @param mixed $prev_value Optional. Previous value to check before removing.
+ * @return int|bool Meta ID if the key didn't exist, true on successful update, false on failure.
+ */
+function update_comment_meta($comment_id, $meta_key, $meta_value, $prev_value = '') {
+    return update_metadata('comment', $comment_id, $meta_key, $meta_value, $prev_value);
+}
+/**
+ * Sets the cookies used to store an unauthenticated commentator's identity. Typically used
+ * to recall previous comments by this commentator that are still held in moderation.
+ *
+ * @param object $comment Comment object.
+ * @param object $user Comment author's object.
+ *
+ * @since 3.4.0
+ */
+function wp_set_comment_cookies($comment, $user) {
+    if ( $user->exists() )
+        return;
+    /**
+     * Filter the lifetime of the comment cookie in seconds.
+     *
+     * @since 2.8.0
+     *
+     * @param int $seconds Comment cookie lifetime. Default 30000000.
+     */
+    $comment_cookie_lifetime = apply_filters( 'comment_cookie_lifetime', 30000000 );
+    $secure = ( 'https' === parse_url( home_url(), PHP_URL_SCHEME ) );
+    setcookie( 'comment_author_' . COOKIEHASH, $comment->comment_author, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
+    setcookie( 'comment_author_email_' . COOKIEHASH, $comment->comment_author_email, time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
+    setcookie( 'comment_author_url_' . COOKIEHASH, esc_url($comment->comment_author_url), time() + $comment_cookie_lifetime, COOKIEPATH, COOKIE_DOMAIN, $secure );
+}
+/**
+ * Sanitizes the cookies sent to the user already.
+ *
+ * Will only do anything if the cookies have already been created for the user.
+ * Mostly used after cookies had been sent to use elsewhere.
+ *
+ * @since 2.0.4
+ */
+function sanitize_comment_cookies() {
+    if ( isset( $_COOKIE['comment_author_' . COOKIEHASH] ) ) {
+        /**
+         * Filter the comment author's name cookie before it is set.
+         *
+         * When this filter hook is evaluated in wp_filter_comment(),
+         * the comment author's name string is passed.
+         *
+         * @since 1.5.0
+         *
+         * @param string $author_cookie The comment author name cookie.
+         */
+        $comment_author = apply_filters( 'pre_comment_author_name', $_COOKIE['comment_author_' . COOKIEHASH] );
+        $comment_author = wp_unslash($comment_author);
+        $comment_author = esc_attr($comment_author);
+        $_COOKIE['comment_author_' . COOKIEHASH] = $comment_author;
+    }
+    if ( isset( $_COOKIE['comment_author_email_' . COOKIEHASH] ) ) {
+        /**
+         * Filter the comment author's email cookie before it is set.
+         *
+         * When this filter hook is evaluated in wp_filter_comment(),
+         * the comment author's email string is passed.
+         *
+         * @since 1.5.0
+         *
+         * @param string $author_email_cookie The comment author email cookie.
+         */
+        $comment_author_email = apply_filters( 'pre_comment_author_email', $_COOKIE['comment_author_email_' . COOKIEHASH] );
+        $comment_author_email = wp_unslash($comment_author_email);
+        $comment_author_email = esc_attr($comment_author_email);
+        $_COOKIE['comment_author_email_'.COOKIEHASH] = $comment_author_email;
+    }
+    if ( isset( $_COOKIE['comment_author_url_' . COOKIEHASH] ) ) {
+        /**
+         * Filter the comment author's URL cookie before it is set.
+         *
+         * When this filter hook is evaluated in wp_filter_comment(),
+         * the comment author's URL string is passed.
+         *
+         * @since 1.5.0
+         *
+         * @param string $author_url_cookie The comment author URL cookie.
+         */
+        $comment_author_url = apply_filters( 'pre_comment_author_url', $_COOKIE['comment_author_url_' . COOKIEHASH] );
+        $comment_author_url = wp_unslash($comment_author_url);
+        $_COOKIE['comment_author_url_'.COOKIEHASH] = $comment_author_url;
+    }
+}
+/**
+ * Validates whether this comment is allowed to be made.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $commentdata Contains information on the comment
+ * @return int|string Signifies the approval status (0|1|'spam')
+ */
+function wp_allow_comment( $commentdata ) {
+    global $wpdb;
+    // Simple duplicate check
+    // expected_slashed ($comment_post_ID, $comment_author, $comment_author_email, $comment_content)
+    $dupe = $wpdb->prepare(
+        "SELECT comment_ID FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = %s AND comment_approved != 'trash' AND ( comment_author = %s ",
+        wp_unslash( $commentdata['comment_post_ID'] ),
+        wp_unslash( $commentdata['comment_parent'] ),
+        wp_unslash( $commentdata['comment_author'] )
+    );
+    if ( $commentdata['comment_author_email'] ) {
+        $dupe .= $wpdb->prepare(
+            "OR comment_author_email = %s ",
+            wp_unslash( $commentdata['comment_author_email'] )
+        );
+    }
+    $dupe .= $wpdb->prepare(
+        ") AND comment_content = %s LIMIT 1",
+        wp_unslash( $commentdata['comment_content'] )
+    );
+    if ( $wpdb->get_var( $dupe ) ) {
+        /**
+         * Fires immediately after a duplicate comment is detected.
+         *
+         * @since 3.0.0
+         *
+         * @param array $commentdata Comment data.
+         */
+        do_action( 'comment_duplicate_trigger', $commentdata );
+        if ( defined( 'DOING_AJAX' ) ) {
+            die( __('Duplicate comment detected; it looks as though you&#8217;ve already said that!') );
+        }
+        wp_die( __( 'Duplicate comment detected; it looks as though you&#8217;ve already said that!' ), 409 );
+    }
+    /**
+     * Fires immediately before a comment is marked approved.
+     *
+     * Allows checking for comment flooding.
+     *
+     * @since 2.3.0
+     *
+     * @param string $comment_author_IP    Comment author's IP address.
+     * @param string $comment_author_email Comment author's email.
+     * @param string $comment_date_gmt     GMT date the comment was posted.
+     */
+    do_action(
+        'check_comment_flood',
+        $commentdata['comment_author_IP'],
+        $commentdata['comment_author_email'],
+        $commentdata['comment_date_gmt']
+    );
+    if ( ! empty( $commentdata['user_id'] ) ) {
+        $user = get_userdata( $commentdata['user_id'] );
+        $post_author = $wpdb->get_var( $wpdb->prepare(
+            "SELECT post_author FROM $wpdb->posts WHERE ID = %d LIMIT 1",
+            $commentdata['comment_post_ID']
+        ) );
+    }
+    if ( isset( $user ) && ( $commentdata['user_id'] == $post_author || $user->has_cap( 'moderate_comments' ) ) ) {
+        // The author and the admins get respect.
+        $approved = 1;
+    } else {
+        // Everyone else's comments will be checked.
+        if ( check_comment(
+            $commentdata['comment_author'],
+            $commentdata['comment_author_email'],
+            $commentdata['comment_author_url'],
+            $commentdata['comment_content'],
+            $commentdata['comment_author_IP'],
+            $commentdata['comment_agent'],
+            $commentdata['comment_type']
+        ) ) {
+            $approved = 1;
+        } else {
+            $approved = 0;
+        }
+        if ( wp_blacklist_check(
+            $commentdata['comment_author'],
+            $commentdata['comment_author_email'],
+            $commentdata['comment_author_url'],
+            $commentdata['comment_content'],
+            $commentdata['comment_author_IP'],
+            $commentdata['comment_agent']
+        ) ) {
+            $approved = 'spam';
+        }
+    }
+    /**
+     * Filter a comment's approval status before it is set.
+     *
+     * @since 2.1.0
+     *
+     * @param bool|string $approved    The approval status. Accepts 1, 0, or 'spam'.
+     * @param array       $commentdata Comment data.
+     */
+    $approved = apply_filters( 'pre_comment_approved', $approved, $commentdata );
+    return $approved;
+}
+/**
+ * Check whether comment flooding is occurring.
+ *
+ * Won't run, if current user can manage options, so to not block
+ * administrators.
+ *
+ * @since 2.3.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $ip Comment IP.
+ * @param string $email Comment author email address.
+ * @param string $date MySQL time string.
+ */
+function check_comment_flood_db( $ip, $email, $date ) {
+    global $wpdb;
+    if ( current_user_can( 'manage_options' ) )
+        return; // don't throttle admins
+    $hour_ago = gmdate( 'Y-m-d H:i:s', time() - HOUR_IN_SECONDS );
+    if ( $lasttime = $wpdb->get_var( $wpdb->prepare( "SELECT `comment_date_gmt` FROM `$wpdb->comments` WHERE `comment_date_gmt` >= %s AND ( `comment_author_IP` = %s OR `comment_author_email` = %s ) ORDER BY `comment_date_gmt` DESC LIMIT 1", $hour_ago, $ip, $email ) ) ) {
+        $time_lastcomment = mysql2date('U', $lasttime, false);
+        $time_newcomment  = mysql2date('U', $date, false);
+        /**
+         * Filter the comment flood status.
+         *
+         * @since 2.1.0
+         *
+         * @param bool $bool             Whether a comment flood is occurring. Default false.
+         * @param int  $time_lastcomment Timestamp of when the last comment was posted.
+         * @param int  $time_newcomment  Timestamp of when the new comment was posted.
+         */
+        $flood_die = apply_filters( 'comment_flood_filter', false, $time_lastcomment, $time_newcomment );
+        if ( $flood_die ) {
+            /**
+             * Fires before the comment flood message is triggered.
+             *
+             * @since 1.5.0
+             *
+             * @param int $time_lastcomment Timestamp of when the last comment was posted.
+             * @param int $time_newcomment  Timestamp of when the new comment was posted.
+             */
+            do_action( 'comment_flood_trigger', $time_lastcomment, $time_newcomment );
+            if ( defined('DOING_AJAX') )
+                die( __('You are posting comments too quickly. Slow down.') );
+            wp_die( __( 'You are posting comments too quickly. Slow down.' ), 429 );
+        }
+    }
+}
+/**
+ * Separates an array of comments into an array keyed by comment_type.
+ *
+ * @since 2.7.0
+ *
+ * @param array $comments Array of comments
+ * @return array Array of comments keyed by comment_type.
+ */
+function separate_comments(&$comments) {
+    $comments_by_type = array('comment' => array(), 'trackback' => array(), 'pingback' => array(), 'pings' => array());
+    $count = count($comments);
+    for ( $i = 0; $i < $count; $i++ ) {
+        $type = $comments[$i]->comment_type;
+        if ( empty($type) )
+            $type = 'comment';
+        $comments_by_type[$type][] = &$comments[$i];
+        if ( 'trackback' == $type || 'pingback' == $type )
+            $comments_by_type['pings'][] = &$comments[$i];
+    }
+    return $comments_by_type;
+}
+/**
+ * Calculate the total number of comment pages.
+ *
+ * @since 2.7.0
+ *
+ * @uses Walker_Comment
+ *
+ * @global WP_Query $wp_query
+ *
+ * @param array $comments Optional array of comment objects. Defaults to $wp_query->comments
+ * @param int   $per_page Optional comments per page.
+ * @param bool  $threaded Optional control over flat or threaded comments.
+ * @return int Number of comment pages.
+ */
+function get_comment_pages_count( $comments = null, $per_page = null, $threaded = null ) {
+    global $wp_query;
+    if ( null === $comments && null === $per_page && null === $threaded && !empty($wp_query->max_num_comment_pages) )
+        return $wp_query->max_num_comment_pages;
+    if ( ( ! $comments || ! is_array( $comments ) ) && ! empty( $wp_query->comments )  )
+        $comments = $wp_query->comments;
+    if ( empty($comments) )
+        return 0;
+    if ( ! get_option( 'page_comments' ) )
+        return 1;
+    if ( !isset($per_page) )
+        $per_page = (int) get_query_var('comments_per_page');
+    if ( 0 === $per_page )
+        $per_page = (int) get_option('comments_per_page');
+    if ( 0 === $per_page )
+        return 1;
+    if ( !isset($threaded) )
+        $threaded = get_option('thread_comments');
+    if ( $threaded ) {
+        $walker = new Walker_Comment;
+        $count = ceil( $walker->get_number_of_root_elements( $comments ) / $per_page );
+    } else {
+        $count = ceil( count( $comments ) / $per_page );
+    }
+    return $count;
+}
+/**
+ * Calculate what page number a comment will appear on for comment paging.
+ *
+ * @since 2.7.0
+ *
+ * @global wpdb $wpdb
+ *
+ * @param int $comment_ID Comment ID.
+ * @param array $args Optional args.
+ * @return int|null Comment page number or null on error.
+ */
+function get_page_of_comment( $comment_ID, $args = array() ) {
+    global $wpdb;
+    if ( !$comment = get_comment( $comment_ID ) )
+        return;
+    $defaults = array( 'type' => 'all', 'page' => '', 'per_page' => '', 'max_depth' => '' );
+    $args = wp_parse_args( $args, $defaults );
+    if ( '' === $args['per_page'] && get_option('page_comments') )
+        $args['per_page'] = get_query_var('comments_per_page');
+    if ( empty($args['per_page']) ) {
+        $args['per_page'] = 0;
+        $args['page'] = 0;
+    }
+    if ( $args['per_page'] < 1 )
+        return 1;
+    if ( '' === $args['max_depth'] ) {
+        if ( get_option('thread_comments') )
+            $args['max_depth'] = get_option('thread_comments_depth');
+        else
+            $args['max_depth'] = -1;
+    }
+    // Find this comment's top level parent if threading is enabled
+    if ( $args['max_depth'] > 1 && 0 != $comment->comment_parent )
+        return get_page_of_comment( $comment->comment_parent, $args );
+    $allowedtypes = array(
+        'comment' => '',
+        'pingback' => 'pingback',
+        'trackback' => 'trackback',
+    );
+    $comtypewhere = ( 'all' != $args['type'] && isset($allowedtypes[$args['type']]) ) ? " AND comment_type = '" . $allowedtypes[$args['type']] . "'" : '';
+    // Count comments older than this one
+    $oldercoms = $wpdb->get_var( $wpdb->prepare( "SELECT COUNT(comment_ID) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_parent = 0 AND comment_approved = '1' AND comment_date_gmt < '%s'" . $comtypewhere, $comment->comment_post_ID, $comment->comment_date_gmt ) );
+    // No older comments? Then it's page #1.
+    if ( 0 == $oldercoms )
+        return 1;
+    // Divide comments older than this one by comments per page to get this comment's page number
+    return ceil( ( $oldercoms + 1 ) / $args['per_page'] );
+}
+/**
+ * Does comment contain blacklisted characters or words.
+ *
+ * @since 1.5.0
+ *
+ * @param string $author The author of the comment
+ * @param string $email The email of the comment
+ * @param string $url The url used in the comment
+ * @param string $comment The comment content
+ * @param string $user_ip The comment author IP address
+ * @param string $user_agent The author's browser user agent
+ * @return bool True if comment contains blacklisted content, false if comment does not
+ */
+function wp_blacklist_check($author, $email, $url, $comment, $user_ip, $user_agent) {
+    /**
+     * Fires before the comment is tested for blacklisted characters or words.
+     *
+     * @since 1.5.0
+     *
+     * @param string $author     Comment author.
+     * @param string $email      Comment author's email.
+     * @param string $url        Comment author's URL.
+     * @param string $comment    Comment content.
+     * @param string $user_ip    Comment author's IP address.
+     * @param string $user_agent Comment author's browser user agent.
+     */
+    do_action( 'wp_blacklist_check', $author, $email, $url, $comment, $user_ip, $user_agent );
+    $mod_keys = trim( get_option('blacklist_keys') );
+    if ( '' == $mod_keys )
+        return false; // If moderation keys are empty
+    $words = explode("\n", $mod_keys );
+    foreach ( (array) $words as $word ) {
+        $word = trim($word);
+        // Skip empty lines
+        if ( empty($word) ) { continue; }
+        // Do some escaping magic so that '#' chars in the
+        // spam words don't break things:
+        $word = preg_quote($word, '#');
+        $pattern = "#$word#i";
+        if (
+               preg_match($pattern, $author)
+            || preg_match($pattern, $email)
+            || preg_match($pattern, $url)
+            || preg_match($pattern, $comment)
+            || preg_match($pattern, $user_ip)
+            || preg_match($pattern, $user_agent)
+         )
+            return true;
+    }
+    return false;
+}
+/**
+ * Retrieve total comments for blog or single post.
+ *
+ * The properties of the returned object contain the 'moderated', 'approved',
+ * and spam comments for either the entire blog or single post. Those properties
+ * contain the amount of comments that match the status. The 'total_comments'
+ * property contains the integer of total comments.
+ *
+ * The comment stats are cached and then retrieved, if they already exist in the
+ * cache.
+ *
+ * @since 2.5.0
+ *
+ * @global wpdb $wpdb
+ *
+ * @param int $post_id Optional. Post ID.
+ * @return object|array Comment stats.
+ */
+function wp_count_comments( $post_id = 0 ) {
+    global $wpdb;
+    $post_id = (int) $post_id;
+    /**
+     * Filter the comments count for a given post.
+     *
+     * @since 2.7.0
+     *
+     * @param array $count   An empty array.
+     * @param int   $post_id The post ID.
+     */
+    $stats = apply_filters( 'wp_count_comments', array(), $post_id );
+    if ( !empty($stats) )
+        return $stats;
+    $count = wp_cache_get("comments-{$post_id}", 'counts');
+    if ( false !== $count )
+        return $count;
+    $where = '';
+    if ( $post_id > 0 )
+        $where = $wpdb->prepare( "WHERE comment_post_ID = %d", $post_id );
+    $count = $wpdb->get_results( "SELECT comment_approved, COUNT( * ) AS num_comments FROM {$wpdb->comments} {$where} GROUP BY comment_approved", ARRAY_A );
+    $total = 0;
+    $approved = array('0' => 'moderated', '1' => 'approved', 'spam' => 'spam', 'trash' => 'trash', 'post-trashed' => 'post-trashed');
+    foreach ( (array) $count as $row ) {
+        // Don't count post-trashed toward totals
+        if ( 'post-trashed' != $row['comment_approved'] && 'trash' != $row['comment_approved'] )
+            $total += $row['num_comments'];
+        if ( isset( $approved[$row['comment_approved']] ) )
+            $stats[$approved[$row['comment_approved']]] = $row['num_comments'];
+    }
+    $stats['total_comments'] = $total;
+    foreach ( $approved as $key ) {
+        if ( empty($stats[$key]) )
+            $stats[$key] = 0;
+    }
+    $stats = (object) $stats;
+    wp_cache_set("comments-{$post_id}", $stats, 'counts');
+    return $stats;
+}
+/**
+ * Trashes or deletes a comment.
+ *
+ * The comment is moved to trash instead of permanently deleted unless trash is
+ * disabled, item is already in the trash, or $force_delete is true.
+ *
+ * The post comment count will be updated if the comment was approved and has a
+ * post ID available.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $comment_id Comment ID
+ * @param bool $force_delete Whether to bypass trash and force deletion. Default is false.
+ * @return bool True on success, false on failure.
+ */
+function wp_delete_comment($comment_id, $force_delete = false) {
+    global $wpdb;
+    if (!$comment = get_comment($comment_id))
+        return false;
+    if ( !$force_delete && EMPTY_TRASH_DAYS && !in_array( wp_get_comment_status($comment_id), array( 'trash', 'spam' ) ) )
+        return wp_trash_comment($comment_id);
+    /**
+     * Fires immediately before a comment is deleted from the database.
+     *
+     * @since 1.2.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'delete_comment', $comment_id );
+    // Move children up a level.
+    $children = $wpdb->get_col( $wpdb->prepare("SELECT comment_ID FROM $wpdb->comments WHERE comment_parent = %d", $comment_id) );
+    if ( !empty($children) ) {
+        $wpdb->update($wpdb->comments, array('comment_parent' => $comment->comment_parent), array('comment_parent' => $comment_id));
+        clean_comment_cache($children);
+    }
+    // Delete metadata
+    $meta_ids = $wpdb->get_col( $wpdb->prepare( "SELECT meta_id FROM $wpdb->commentmeta WHERE comment_id = %d", $comment_id ) );
+    foreach ( $meta_ids as $mid )
+        delete_metadata_by_mid( 'comment', $mid );
+    if ( ! $wpdb->delete( $wpdb->comments, array( 'comment_ID' => $comment_id ) ) )
+        return false;
+    /**
+     * Fires immediately after a comment is deleted from the database.
+     *
+     * @since 2.9.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'deleted_comment', $comment_id );
+    $post_id = $comment->comment_post_ID;
+    if ( $post_id && $comment->comment_approved == 1 )
+        wp_update_comment_count($post_id);
+    clean_comment_cache($comment_id);
+    /** This action is documented in wp-includes/comment.php */
+    do_action( 'wp_set_comment_status', $comment_id, 'delete' );
+    wp_transition_comment_status('delete', $comment->comment_approved, $comment);
+    return true;
+}
+/**
+ * Moves a comment to the Trash
+ *
+ * If trash is disabled, comment is permanently deleted.
+ *
+ * @since 2.9.0
+ *
+ * @param int $comment_id Comment ID.
+ * @return bool True on success, false on failure.
+ */
+function wp_trash_comment($comment_id) {
+    if ( !EMPTY_TRASH_DAYS )
+        return wp_delete_comment($comment_id, true);
+    if ( !$comment = get_comment($comment_id) )
+        return false;
+    /**
+     * Fires immediately before a comment is sent to the Trash.
+     *
+     * @since 2.9.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'trash_comment', $comment_id );
+    if ( wp_set_comment_status($comment_id, 'trash') ) {
+        delete_comment_meta( $comment_id, '_wp_trash_meta_status' );
+        delete_comment_meta( $comment_id, '_wp_trash_meta_time' );
+        add_comment_meta( $comment_id, '_wp_trash_meta_status', $comment->comment_approved );
+        add_comment_meta( $comment_id, '_wp_trash_meta_time', time() );
+        /**
+         * Fires immediately after a comment is sent to Trash.
+         *
+         * @since 2.9.0
+         *
+         * @param int $comment_id The comment ID.
+         */
+        do_action( 'trashed_comment', $comment_id );
+        return true;
+    }
+    return false;
+}
+/**
+ * Removes a comment from the Trash
+ *
+ * @since 2.9.0
+ *
+ * @param int $comment_id Comment ID.
+ * @return bool True on success, false on failure.
+ */
+function wp_untrash_comment($comment_id) {
+    if ( ! (int)$comment_id )
+        return false;
+    /**
+     * Fires immediately before a comment is restored from the Trash.
+     *
+     * @since 2.9.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'untrash_comment', $comment_id );
+    $status = (string) get_comment_meta($comment_id, '_wp_trash_meta_status', true);
+    if ( empty($status) )
+        $status = '0';
+    if ( wp_set_comment_status($comment_id, $status) ) {
+        delete_comment_meta($comment_id, '_wp_trash_meta_time');
+        delete_comment_meta($comment_id, '_wp_trash_meta_status');
+        /**
+         * Fires immediately after a comment is restored from the Trash.
+         *
+         * @since 2.9.0
+         *
+         * @param int $comment_id The comment ID.
+         */
+        do_action( 'untrashed_comment', $comment_id );
+        return true;
+    }
+    return false;
+}
+/**
+ * Marks a comment as Spam
+ *
+ * @since 2.9.0
+ *
+ * @param int $comment_id Comment ID.
+ * @return bool True on success, false on failure.
+ */
+function wp_spam_comment($comment_id) {
+    if ( !$comment = get_comment($comment_id) )
+        return false;
+    /**
+     * Fires immediately before a comment is marked as Spam.
+     *
+     * @since 2.9.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'spam_comment', $comment_id );
+    if ( wp_set_comment_status($comment_id, 'spam') ) {
+        delete_comment_meta( $comment_id, '_wp_trash_meta_status' );
+        delete_comment_meta( $comment_id, '_wp_trash_meta_time' );
+        add_comment_meta( $comment_id, '_wp_trash_meta_status', $comment->comment_approved );
+        add_comment_meta( $comment_id, '_wp_trash_meta_time', time() );
+        /**
+         * Fires immediately after a comment is marked as Spam.
+         *
+         * @since 2.9.0
+         *
+         * @param int $comment_id The comment ID.
+         */
+        do_action( 'spammed_comment', $comment_id );
+        return true;
+    }
+    return false;
+}
+/**
+ * Removes a comment from the Spam
+ *
+ * @since 2.9.0
+ *
+ * @param int $comment_id Comment ID.
+ * @return bool True on success, false on failure.
+ */
+function wp_unspam_comment($comment_id) {
+    if ( ! (int)$comment_id )
+        return false;
+    /**
+     * Fires immediately before a comment is unmarked as Spam.
+     *
+     * @since 2.9.0
+     *
+     * @param int $comment_id The comment ID.
+     */
+    do_action( 'unspam_comment', $comment_id );
+    $status = (string) get_comment_meta($comment_id, '_wp_trash_meta_status', true);
+    if ( empty($status) )
+        $status = '0';
+    if ( wp_set_comment_status($comment_id, $status) ) {
+        delete_comment_meta( $comment_id, '_wp_trash_meta_status' );
+        delete_comment_meta( $comment_id, '_wp_trash_meta_time' );
+        /**
+         * Fires immediately after a comment is unmarked as Spam.
+         *
+         * @since 2.9.0
+         *
+         * @param int $comment_id The comment ID.
+         */
+        do_action( 'unspammed_comment', $comment_id );
+        return true;
+    }
+    return false;
+}
+/**
+ * The status of a comment by ID.
+ *
+ * @since 1.0.0
+ *
+ * @param int $comment_id Comment ID
+ * @return false|string Status might be 'trash', 'approved', 'unapproved', 'spam'. False on failure.
+ */
+function wp_get_comment_status($comment_id) {
+    $comment = get_comment($comment_id);
+    if ( !$comment )
+        return false;
+    $approved = $comment->comment_approved;
+    if ( $approved == null )
+        return false;
+    elseif ( $approved == '1' )
+        return 'approved';
+    elseif ( $approved == '0' )
+        return 'unapproved';
+    elseif ( $approved == 'spam' )
+        return 'spam';
+    elseif ( $approved == 'trash' )
+        return 'trash';
+    else
+        return false;
+}
+/**
+ * Call hooks for when a comment status transition occurs.
+ *
+ * Calls hooks for comment status transitions. If the new comment status is not the same
+ * as the previous comment status, then two hooks will be ran, the first is
+ * 'transition_comment_status' with new status, old status, and comment data. The
+ * next action called is 'comment_OLDSTATUS_to_NEWSTATUS' the NEWSTATUS is the
+ * $new_status parameter and the OLDSTATUS is $old_status parameter; it has the
+ * comment data.
+ *
+ * The final action will run whether or not the comment statuses are the same. The
+ * action is named 'comment_NEWSTATUS_COMMENTTYPE', NEWSTATUS is from the $new_status
+ * parameter and COMMENTTYPE is comment_type comment data.
+ *
+ * @since 2.7.0
+ *
+ * @param string $new_status New comment status.
+ * @param string $old_status Previous comment status.
+ * @param object $comment Comment data.
+ */
+function wp_transition_comment_status($new_status, $old_status, $comment) {
+    /*
+     * Translate raw statuses to human readable formats for the hooks.
+     * This is not a complete list of comment status, it's only the ones
+     * that need to be renamed
+     */
+    $comment_statuses = array(
+         => 'unapproved',
+        'hold'    => 'unapproved', // wp_set_comment_status() uses "hold"
+         => 'approved',
+        'approve' => 'approved', // wp_set_comment_status() uses "approve"
+    );
+    if ( isset($comment_statuses[$new_status]) ) $new_status = $comment_statuses[$new_status];
+    if ( isset($comment_statuses[$old_status]) ) $old_status = $comment_statuses[$old_status];
+    // Call the hooks
+    if ( $new_status != $old_status ) {
+        /**
+         * Fires when the comment status is in transition.
+         *
+         * @since 2.7.0
+         *
+         * @param int|string $new_status The new comment status.
+         * @param int|string $old_status The old comment status.
+         * @param object     $comment    The comment data.
+         */
+        do_action( 'transition_comment_status', $new_status, $old_status, $comment );
+        /**
+         * Fires when the comment status is in transition from one specific status to another.
+         *
+         * The dynamic portions of the hook name, `$old_status`, and `$new_status`,
+         * refer to the old and new comment statuses, respectively.
+         *
+         * @since 2.7.0
+         *
+         * @param object $comment Comment object.
+         */
+        do_action( "comment_{$old_status}_to_{$new_status}", $comment );
+    }
+    /**
+     * Fires when the status of a specific comment type is in transition.
+     *
+     * The dynamic portions of the hook name, `$new_status`, and `$comment->comment_type`,
+     * refer to the new comment status, and the type of comment, respectively.
+     *
+     * Typical comment types include an empty string (standard comment), 'pingback',
+     * or 'trackback'.
+     *
+     * @since 2.7.0
+     *
+     * @param int $comment_ID The comment ID.
+     * @param obj $comment    Comment object.
+     */
+    do_action( "comment_{$new_status}_{$comment->comment_type}", $comment->comment_ID, $comment );
+}
+/**
+ * Get current commenter's name, email, and URL.
+ *
+ * Expects cookies content to already be sanitized. User of this function might
+ * wish to recheck the returned array for validity.
+ *
+ * @see sanitize_comment_cookies() Use to sanitize cookies
+ *
+ * @since 2.0.4
+ *
+ * @return array Comment author, email, url respectively.
+ */
+function wp_get_current_commenter() {
+    // Cookies should already be sanitized.
+    $comment_author = '';
+    if ( isset($_COOKIE['comment_author_'.COOKIEHASH]) )
+        $comment_author = $_COOKIE['comment_author_'.COOKIEHASH];
+    $comment_author_email = '';
+    if ( isset($_COOKIE['comment_author_email_'.COOKIEHASH]) )
+        $comment_author_email = $_COOKIE['comment_author_email_'.COOKIEHASH];
+    $comment_author_url = '';
+    if ( isset($_COOKIE['comment_author_url_'.COOKIEHASH]) )
+        $comment_author_url = $_COOKIE['comment_author_url_'.COOKIEHASH];
+    /**
+     * Filter the current commenter's name, email, and URL.
+     *
+     * @since 3.1.0
+     *
+     * @param string $comment_author       Comment author's name.
+     * @param string $comment_author_email Comment author's email.
+     * @param string $comment_author_url   Comment author's URL.
+     */
+    return apply_filters( 'wp_get_current_commenter', compact('comment_author', 'comment_author_email', 'comment_author_url') );
+}
+/**
+ * Inserts a comment into the database.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $commentdata {
+ *     Array of arguments for inserting a new comment.
+ *
+ *     @type string     $comment_agent        The HTTP user agent of the `$comment_author` when
+ *                                            the comment was submitted. Default empty.
+ *     @type int|string $comment_approved     Whether the comment has been approved. Default 1.
+ *     @type string     $comment_author       The name of the author of the comment. Default empty.
+ *     @type string     $comment_author_email The email address of the `$comment_author`. Default empty.
+ *     @type string     $comment_author_IP    The IP address of the `$comment_author`. Default empty.
+ *     @type string     $comment_author_url   The URL address of the `$comment_author`. Default empty.
+ *     @type string     $comment_content      The content of the comment. Default empty.
+ *     @type string     $comment_date         The date the comment was submitted. To set the date
+ *                                            manually, `$comment_date_gmt` must also be specified.
+ *                                            Default is the current time.
+ *     @type string     $comment_date_gmt     The date the comment was submitted in the GMT timezone.
+ *                                            Default is `$comment_date` in the site's GMT timezone.
+ *     @type int        $comment_karma        The karma of the comment. Default 0.
+ *     @type int        $comment_parent       ID of this comment's parent, if any. Default 0.
+ *     @type int        $comment_post_ID      ID of the post that relates to the comment, if any.
+ *                                            Default empty.
+ *     @type string     $comment_type         Comment type. Default empty.
+ *     @type int        $user_id              ID of the user who submitted the comment. Default 0.
+ * }
+ * @return int|false The new comment's ID on success, false on failure.
+ */
+function wp_insert_comment( $commentdata ) {
+    global $wpdb;
+    $data = wp_unslash( $commentdata );
+    $comment_author       = ! isset( $data['comment_author'] )       ? '' : $data['comment_author'];
+    $comment_author_email = ! isset( $data['comment_author_email'] ) ? '' : $data['comment_author_email'];
+    $comment_author_url   = ! isset( $data['comment_author_url'] )   ? '' : $data['comment_author_url'];
+    $comment_author_IP    = ! isset( $data['comment_author_IP'] )    ? '' : $data['comment_author_IP'];
+    $comment_date     = ! isset( $data['comment_date'] )     ? current_time( 'mysql' )            : $data['comment_date'];
+    $comment_date_gmt = ! isset( $data['comment_date_gmt'] ) ? get_gmt_from_date( $comment_date ) : $data['comment_date_gmt'];
+    $comment_post_ID  = ! isset( $data['comment_post_ID'] )  ? '' : $data['comment_post_ID'];
+    $comment_content  = ! isset( $data['comment_content'] )  ? '' : $data['comment_content'];
+    $comment_karma    = ! isset( $data['comment_karma'] )    ? 0  : $data['comment_karma'];
+    $comment_approved = ! isset( $data['comment_approved'] ) ? 1  : $data['comment_approved'];
+    $comment_agent    = ! isset( $data['comment_agent'] )    ? '' : $data['comment_agent'];
+    $comment_type     = ! isset( $data['comment_type'] )     ? '' : $data['comment_type'];
+    $comment_parent   = ! isset( $data['comment_parent'] )   ? 0  : $data['comment_parent'];
+    $user_id  = ! isset( $data['user_id'] ) ? 0 : $data['user_id'];
+    $compacted = compact( 'comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_date', 'comment_date_gmt', 'comment_content', 'comment_karma', 'comment_approved', 'comment_agent', 'comment_type', 'comment_parent', 'user_id' );
+    if ( ! $wpdb->insert( $wpdb->comments, $compacted ) ) {
+        return false;
+    }
+    $id = (int) $wpdb->insert_id;
+    if ( $comment_approved == 1 ) {
+        wp_update_comment_count( $comment_post_ID );
+    }
+    $comment = get_comment( $id );
+    /**
+     * Fires immediately after a comment is inserted into the database.
+     *
+     * @since 2.8.0
+     *
+     * @param int $id      The comment ID.
+     * @param obj $comment Comment object.
+     */
+    do_action( 'wp_insert_comment', $id, $comment );
+    wp_cache_set( 'last_changed', microtime(), 'comment' );
+    return $id;
+}
+/**
+ * Filters and sanitizes comment data.
+ *
+ * Sets the comment data 'filtered' field to true when finished. This can be
+ * checked as to whether the comment should be filtered and to keep from
+ * filtering the same comment more than once.
+ *
+ * @since 2.0.0
+ *
+ * @param array $commentdata Contains information on the comment.
+ * @return array Parsed comment information.
+ */
+function wp_filter_comment($commentdata) {
+    if ( isset( $commentdata['user_ID'] ) ) {
+        /**
+         * Filter the comment author's user id before it is set.
+         *
+         * The first time this filter is evaluated, 'user_ID' is checked
+         * (for back-compat), followed by the standard 'user_id' value.
+         *
+         * @since 1.5.0
+         *
+         * @param int $user_ID The comment author's user ID.
+         */
+        $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_ID'] );
+    } elseif ( isset( $commentdata['user_id'] ) ) {
+        /** This filter is documented in wp-includes/comment.php */
+        $commentdata['user_id'] = apply_filters( 'pre_user_id', $commentdata['user_id'] );
+    }
+    /**
+     * Filter the comment author's browser user agent before it is set.
+     *
+     * @since 1.5.0
+     *
+     * @param int $comment_agent The comment author's browser user agent.
+     */
+    $commentdata['comment_agent'] = apply_filters( 'pre_comment_user_agent', ( isset( $commentdata['comment_agent'] ) ? $commentdata['comment_agent'] : '' ) );
+    /** This filter is documented in wp-includes/comment.php */
+    $commentdata['comment_author'] = apply_filters( 'pre_comment_author_name', $commentdata['comment_author'] );
+    /**
+     * Filter the comment content before it is set.
+     *
+     * @since 1.5.0
+     *
+     * @param int $comment_content The comment content.
+     */
+    $commentdata['comment_content'] = apply_filters( 'pre_comment_content', $commentdata['comment_content'] );
+    /**
+     * Filter the comment author's IP before it is set.
+     *
+     * @since 1.5.0
+     *
+     * @param int $comment_author_ip The comment author's IP.
+     */
+    $commentdata['comment_author_IP'] = apply_filters( 'pre_comment_user_ip', $commentdata['comment_author_IP'] );
+    /** This filter is documented in wp-includes/comment.php */
+    $commentdata['comment_author_url'] = apply_filters( 'pre_comment_author_url', $commentdata['comment_author_url'] );
+    /** This filter is documented in wp-includes/comment.php */
+    $commentdata['comment_author_email'] = apply_filters( 'pre_comment_author_email', $commentdata['comment_author_email'] );
+    $commentdata['filtered'] = true;
+    return $commentdata;
+}
+/**
+ * Whether a comment should be blocked because of comment flood.
+ *
+ * @since 2.1.0
+ *
+ * @param bool $block Whether plugin has already blocked comment.
+ * @param int $time_lastcomment Timestamp for last comment.
+ * @param int $time_newcomment Timestamp for new comment.
+ * @return bool Whether comment should be blocked.
+ */
+function wp_throttle_comment_flood($block, $time_lastcomment, $time_newcomment) {
+    if ( $block ) // a plugin has already blocked... we'll let that decision stand
+        return $block;
+    if ( ($time_newcomment - $time_lastcomment) < 15 )
+        return true;
+    return false;
+}
+/**
+ * Adds a new comment to the database.
+ *
+ * Filters new comment to ensure that the fields are sanitized and valid before
+ * inserting comment into database. Calls 'comment_post' action with comment ID
+ * and whether comment is approved by WordPress. Also has 'preprocess_comment'
+ * filter for processing the comment data before the function handles it.
+ *
+ * We use REMOTE_ADDR here directly. If you are behind a proxy, you should ensure
+ * that it is properly set, such as in wp-config.php, for your environment.
+ * See {@link https://core.trac.wordpress.org/ticket/9235}
+ *
+ * @since 1.5.0
+ * @since 4.3.0 'comment_agent' and 'comment_author_IP' can be set via `$commentdata`.
+ *
+ * @see wp_insert_comment()
+ *
+ * @global wpdb $wpdb
+ *
+ * @param array $commentdata {
+ *     Comment data.
+ *
+ *     @type string $comment_author       The name of the comment author.
+ *     @type string $comment_author_email The comment author email address.
+ *     @type string $comment_author_url   The comment author URL.
+ *     @type string $comment_content      The content of the comment.
+ *     @type string $comment_date         The date the comment was submitted. Default is the current time.
+ *     @type string $comment_date_gmt     The date the comment was submitted in the GMT timezone.
+ *                                        Default is `$comment_date` in the GMT timezone.
+ *     @type int    $comment_parent       The ID of this comment's parent, if any. Default 0.
+ *     @type int    $comment_post_ID      The ID of the post that relates to the comment.
+ *     @type int    $user_id              The ID of the user who submitted the comment. Default 0.
+ *     @type int    $user_ID              Kept for backward-compatibility. Use `$user_id` instead.
+ *     @type string $comment_agent        Comment author user agent. Default is the value of 'HTTP_USER_AGENT'
+ *                                        in the `$_SERVER` superglobal sent in the original request.
+ *     @type string $comment_author_IP    Comment author IP address in IPv4 format. Default is the value of
+ *                                        'REMOTE_ADDR' in the `$_SERVER` superglobal sent in the original request.
+ * }
+ * @return int|false The ID of the comment on success, false on failure.
+ */
+function wp_new_comment( $commentdata ) {
+    global $wpdb;
+    if ( isset( $commentdata['user_ID'] ) ) {
+        $commentdata['user_id'] = $commentdata['user_ID'] = (int) $commentdata['user_ID'];
+    }
+    $prefiltered_user_id = ( isset( $commentdata['user_id'] ) ) ? (int) $commentdata['user_id'] : 0;
+    /**
+     * Filter a comment's data before it is sanitized and inserted into the database.
+     *
+     * @since 1.5.0
+     *
+     * @param array $commentdata Comment data.
+     */
+    $commentdata = apply_filters( 'preprocess_comment', $commentdata );
+    $commentdata['comment_post_ID'] = (int) $commentdata['comment_post_ID'];
+    if ( isset( $commentdata['user_ID'] ) && $prefiltered_user_id !== (int) $commentdata['user_ID'] ) {
+        $commentdata['user_id'] = $commentdata['user_ID'] = (int) $commentdata['user_ID'];
+    } elseif ( isset( $commentdata['user_id'] ) ) {
+        $commentdata['user_id'] = (int) $commentdata['user_id'];
+    }
+    $commentdata['comment_parent'] = isset($commentdata['comment_parent']) ? absint($commentdata['comment_parent']) : 0;
+    $parent_status = ( 0 < $commentdata['comment_parent'] ) ? wp_get_comment_status($commentdata['comment_parent']) : '';
+    $commentdata['comment_parent'] = ( 'approved' == $parent_status || 'unapproved' == $parent_status ) ? $commentdata['comment_parent'] : 0;
+    if ( ! isset( $commentdata['comment_author_IP'] ) ) {
+        $commentdata['comment_author_IP'] = $_SERVER['REMOTE_ADDR'];
+    }
+    $commentdata['comment_author_IP'] = preg_replace( '/[^0-9a-fA-F:., ]/', '', $commentdata['comment_author_IP'] );
+    if ( ! isset( $commentdata['comment_agent'] ) ) {
+        $commentdata['comment_agent'] = isset( $_SERVER['HTTP_USER_AGENT'] ) ? $_SERVER['HTTP_USER_AGENT']: '';
+    }
+    $commentdata['comment_agent'] = substr( $commentdata['comment_agent'], 0, 254 );
+    if ( empty( $commentdata['comment_date'] ) ) {
+        $commentdata['comment_date'] = current_time('mysql');
+    }
+    if ( empty( $commentdata['comment_date_gmt'] ) ) {
+        $commentdata['comment_date_gmt'] = current_time( 'mysql', 1 );
+    }
+    $commentdata = wp_filter_comment($commentdata);
+    $commentdata['comment_approved'] = wp_allow_comment($commentdata);
+    $comment_ID = wp_insert_comment($commentdata);
+    if ( ! $comment_ID ) {
+        $fields = array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content' );
+        foreach ( $fields as $field ) {
+            if ( isset( $commentdata[ $field ] ) ) {
+                $commentdata[ $field ] = $wpdb->strip_invalid_text_for_column( $wpdb->comments, $field, $commentdata[ $field ] );
+            }
+        }
+        $commentdata = wp_filter_comment( $commentdata );
+        $commentdata['comment_approved'] = wp_allow_comment( $commentdata );
+        $comment_ID = wp_insert_comment( $commentdata );
+        if ( ! $comment_ID ) {
+            return false;
+        }
+    }
+    /**
+     * Fires immediately after a comment is inserted into the database.
+     *
+     * @since 1.2.0
+     *
+     * @param int $comment_ID       The comment ID.
+     * @param int $comment_approved 1 (true) if the comment is approved, 0 (false) if not.
+     */
+    do_action( 'comment_post', $comment_ID, $commentdata['comment_approved'] );
+    if ( 'spam' !== $commentdata['comment_approved'] ) { // If it's spam save it silently for later crunching
+        if ( '0' == $commentdata['comment_approved'] ) {
+            wp_notify_moderator( $comment_ID );
+        }
+        // wp_notify_postauthor() checks if notifying the author of their own comment.
+        // By default, it won't, but filters can override this.
+        if ( get_option( 'comments_notify' ) && $commentdata['comment_approved'] ) {
+            wp_notify_postauthor( $comment_ID );
+        }
+    }
+    return $comment_ID;
+}
+/**
+ * Sets the status of a comment.
+ *
+ * The 'wp_set_comment_status' action is called after the comment is handled.
+ * If the comment status is not in the list, then false is returned.
+ *
+ * @since 1.0.0
+ *
+ * global wpdb $wpdb
+ *
+ * @param int $comment_id Comment ID.
+ * @param string $comment_status New comment status, either 'hold', 'approve', 'spam', or 'trash'.
+ * @param bool $wp_error Whether to return a WP_Error object if there is a failure. Default is false.
+ * @return bool|WP_Error True on success, false or WP_Error on failure.
+ */
+function wp_set_comment_status($comment_id, $comment_status, $wp_error = false) {
+    global $wpdb;
+    switch ( $comment_status ) {
+        case 'hold':
+        case '0':
+            $status = '0';
+            break;
+        case 'approve':
+        case '1':
+            $status = '1';
+            if ( get_option('comments_notify') ) {
+                wp_notify_postauthor( $comment_id );
+            }
+            break;
+        case 'spam':
+            $status = 'spam';
+            break;
+        case 'trash':
+            $status = 'trash';
+            break;
+        default:
+            return false;
+    }
+    $comment_old = clone get_comment($comment_id);
+    if ( !$wpdb->update( $wpdb->comments, array('comment_approved' => $status), array('comment_ID' => $comment_id) ) ) {
+        if ( $wp_error )
+            return new WP_Error('db_update_error', __('Could not update comment status'), $wpdb->last_error);
+        else
+            return false;
+    }
+    clean_comment_cache($comment_id);
+    $comment = get_comment($comment_id);
+    /**
+     * Fires immediately before transitioning a comment's status from one to another
+     * in the database.
+     *
+     * @since 1.5.0
+     *
+     * @param int         $comment_id     Comment ID.
+     * @param string|bool $comment_status Current comment status. Possible values include
+     *                                    'hold', 'approve', 'spam', 'trash', or false.
+     */
+    do_action( 'wp_set_comment_status', $comment_id, $comment_status );
+    wp_transition_comment_status($comment_status, $comment_old->comment_approved, $comment);
+    wp_update_comment_count($comment->comment_post_ID);
+    return true;
+}
+/**
+ * Updates an existing comment in the database.
+ *
+ * Filters the comment and makes sure certain fields are valid before updating.
+ *
+ * @since 2.0.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param array $commentarr Contains information on the comment.
+ * @return int Comment was updated if value is 1, or was not updated if value is 0.
+ */
+function wp_update_comment($commentarr) {
+    global $wpdb;
+    // First, get all of the original fields
+    $comment = get_comment($commentarr['comment_ID'], ARRAY_A);
+    if ( empty( $comment ) ) {
+        return 0;
+    }
+    // Make sure that the comment post ID is valid (if specified).
+    if ( isset( $commentarr['comment_post_ID'] ) && ! get_post( $commentarr['comment_post_ID'] ) ) {
+        return 0;
+    }
+    // Escape data pulled from DB.
+    $comment = wp_slash($comment);
+    $old_status = $comment['comment_approved'];
+    // Merge old and new fields with new fields overwriting old ones.
+    $commentarr = array_merge($comment, $commentarr);
+    $commentarr = wp_filter_comment( $commentarr );
+    // Now extract the merged array.
+    $data = wp_unslash( $commentarr );
+    /**
+     * Filter the comment content before it is updated in the database.
+     *
+     * @since 1.5.0
+     *
+     * @param string $comment_content The comment data.
+     */
+    $data['comment_content'] = apply_filters( 'comment_save_pre', $data['comment_content'] );
+    $data['comment_date_gmt'] = get_gmt_from_date( $data['comment_date'] );
+    if ( ! isset( $data['comment_approved'] ) ) {
+        $data['comment_approved'] = 1;
+    } elseif ( 'hold' == $data['comment_approved'] ) {
+        $data['comment_approved'] = 0;
+    } elseif ( 'approve' == $data['comment_approved'] ) {
+        $data['comment_approved'] = 1;
+    }
+    $comment_ID = $data['comment_ID'];
+    $comment_post_ID = $data['comment_post_ID'];
+    $keys = array( 'comment_post_ID', 'comment_content', 'comment_author', 'comment_author_email', 'comment_approved', 'comment_karma', 'comment_author_url', 'comment_date', 'comment_date_gmt', 'comment_type', 'comment_parent', 'user_id' );
+    $data = wp_array_slice_assoc( $data, $keys );
+    $rval = $wpdb->update( $wpdb->comments, $data, compact( 'comment_ID' ) );
+    clean_comment_cache( $comment_ID );
+    wp_update_comment_count( $comment_post_ID );
+    /**
+     * Fires immediately after a comment is updated in the database.
+     *
+     * The hook also fires immediately before comment status transition hooks are fired.
+     *
+     * @since 1.2.0
+     *
+     * @param int $comment_ID The comment ID.
+     */
+    do_action( 'edit_comment', $comment_ID );
+    $comment = get_comment($comment_ID);
+    wp_transition_comment_status($comment->comment_approved, $old_status, $comment);
+    return $rval;
+}
+/**
+ * Whether to defer comment counting.
+ *
+ * When setting $defer to true, all post comment counts will not be updated
+ * until $defer is set to false. When $defer is set to false, then all
+ * previously deferred updated post comment counts will then be automatically
+ * updated without having to call wp_update_comment_count() after.
+ *
+ * @since 2.5.0
+ * @staticvar bool $_defer
+ *
+ * @param bool $defer
+ * @return bool
+ */
+function wp_defer_comment_counting($defer=null) {
+    static $_defer = false;
+    if ( is_bool($defer) ) {
+        $_defer = $defer;
+        // flush any deferred counts
+        if ( !$defer )
+            wp_update_comment_count( null, true );
+    }
+    return $_defer;
+}
+/**
+ * Updates the comment count for post(s).
+ *
+ * When $do_deferred is false (is by default) and the comments have been set to
+ * be deferred, the post_id will be added to a queue, which will be updated at a
+ * later date and only updated once per post ID.
+ *
+ * If the comments have not be set up to be deferred, then the post will be
+ * updated. When $do_deferred is set to true, then all previous deferred post
+ * IDs will be updated along with the current $post_id.
+ *
+ * @since 2.1.0
+ * @see wp_update_comment_count_now() For what could cause a false return value
+ *
+ * @staticvar array $_deferred
+ *
+ * @param int $post_id Post ID
+ * @param bool $do_deferred Whether to process previously deferred post comment counts
+ * @return bool|void True on success, false on failure
+ */
+function wp_update_comment_count($post_id, $do_deferred=false) {
+    static $_deferred = array();
+    if ( $do_deferred ) {
+        $_deferred = array_unique($_deferred);
+        foreach ( $_deferred as $i => $_post_id ) {
+            wp_update_comment_count_now($_post_id);
+            unset( $_deferred[$i] ); /** @todo Move this outside of the foreach and reset $_deferred to an array instead */
+        }
+    }
+    if ( wp_defer_comment_counting() ) {
+        $_deferred[] = $post_id;
+        return true;
+    }
+    elseif ( $post_id ) {
+        return wp_update_comment_count_now($post_id);
+    }
+}
+/**
+ * Updates the comment count for the post.
+ *
+ * @since 2.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $post_id Post ID
+ * @return bool True on success, false on '0' $post_id or if post with ID does not exist.
+ */
+function wp_update_comment_count_now($post_id) {
+    global $wpdb;
+    $post_id = (int) $post_id;
+    if ( !$post_id )
+        return false;
+    if ( !$post = get_post($post_id) )
+        return false;
+    $old = (int) $post->comment_count;
+    $new = (int) $wpdb->get_var( $wpdb->prepare("SELECT COUNT(*) FROM $wpdb->comments WHERE comment_post_ID = %d AND comment_approved = '1'", $post_id) );
+    $wpdb->update( $wpdb->posts, array('comment_count' => $new), array('ID' => $post_id) );
+    clean_post_cache( $post );
+    /**
+     * Fires immediately after a post's comment count is updated in the database.
+     *
+     * @since 2.3.0
+     *
+     * @param int $post_id Post ID.
+     * @param int $new     The new comment count.
+     * @param int $old     The old comment count.
+     */
+    do_action( 'wp_update_comment_count', $post_id, $new, $old );
+    /** This action is documented in wp-includes/post.php */
+    do_action( 'edit_post', $post_id, $post );
+    return true;
+}
+//
+// Ping and trackback functions.
+//
+/**
+ * Finds a pingback server URI based on the given URL.
+ *
+ * Checks the HTML for the rel="pingback" link and x-pingback headers. It does
+ * a check for the x-pingback headers first and returns that, if available. The
+ * check for the rel="pingback" has more overhead than just the header.
+ *
+ * @since 1.5.0
+ *
+ * @param string $url URL to ping.
+ * @param int $deprecated Not Used.
+ * @return false|string False on failure, string containing URI on success.
+ */
+function discover_pingback_server_uri( $url, $deprecated = '' ) {
+    if ( !empty( $deprecated ) )
+        _deprecated_argument( __FUNCTION__, '2.7' );
+    $pingback_str_dquote = 'rel="pingback"';
+    $pingback_str_squote = 'rel=\'pingback\'';
+    /** @todo Should use Filter Extension or custom preg_match instead. */
+    $parsed_url = parse_url($url);
+    if ( ! isset( $parsed_url['host'] ) ) // Not an URL. This should never happen.
+        return false;
+    //Do not search for a pingback server on our own uploads
+    $uploads_dir = wp_upload_dir();
+    if ( 0 === strpos($url, $uploads_dir['baseurl']) )
+        return false;
+    $response = wp_safe_remote_head( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
+    if ( is_wp_error( $response ) )
+        return false;
+    if ( wp_remote_retrieve_header( $response, 'x-pingback' ) )
+        return wp_remote_retrieve_header( $response, 'x-pingback' );
+    // Not an (x)html, sgml, or xml page, no use going further.
+    if ( preg_match('#(image|audio|video|model)/#is', wp_remote_retrieve_header( $response, 'content-type' )) )
+        return false;
+    // Now do a GET since we're going to look in the html headers (and we're sure it's not a binary file)
+    $response = wp_safe_remote_get( $url, array( 'timeout' => 2, 'httpversion' => '1.0' ) );
+    if ( is_wp_error( $response ) )
+        return false;
+    $contents = wp_remote_retrieve_body( $response );
+    $pingback_link_offset_dquote = strpos($contents, $pingback_str_dquote);
+    $pingback_link_offset_squote = strpos($contents, $pingback_str_squote);
+    if ( $pingback_link_offset_dquote || $pingback_link_offset_squote ) {
+        $quote = ($pingback_link_offset_dquote) ? '"' : '\'';
+        $pingback_link_offset = ($quote=='"') ? $pingback_link_offset_dquote : $pingback_link_offset_squote;
+        $pingback_href_pos = @strpos($contents, 'href=', $pingback_link_offset);
+        $pingback_href_start = $pingback_href_pos+6;
+        $pingback_href_end = @strpos($contents, $quote, $pingback_href_start);
+        $pingback_server_url_len = $pingback_href_end - $pingback_href_start;
+        $pingback_server_url = substr($contents, $pingback_href_start, $pingback_server_url_len);
+        // We may find rel="pingback" but an incomplete pingback URL
+        if ( $pingback_server_url_len > 0 ) { // We got it!
+            return $pingback_server_url;
+        }
+    }
+    return false;
+}
+/**
+ * Perform all pingbacks, enclosures, trackbacks, and send to pingback services.
+ *
+ * @since 2.1.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ */
+function do_all_pings() {
+    global $wpdb;
+    // Do pingbacks
+    while ($ping = $wpdb->get_row("SELECT ID, post_content, meta_id FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_pingme' LIMIT 1")) {
+        delete_metadata_by_mid( 'post', $ping->meta_id );
+        pingback( $ping->post_content, $ping->ID );
+    }
+    // Do Enclosures
+    while ($enclosure = $wpdb->get_row("SELECT ID, post_content, meta_id FROM {$wpdb->posts}, {$wpdb->postmeta} WHERE {$wpdb->posts}.ID = {$wpdb->postmeta}.post_id AND {$wpdb->postmeta}.meta_key = '_encloseme' LIMIT 1")) {
+        delete_metadata_by_mid( 'post', $enclosure->meta_id );
+        do_enclose( $enclosure->post_content, $enclosure->ID );
+    }
+    // Do Trackbacks
+    $trackbacks = $wpdb->get_col("SELECT ID FROM $wpdb->posts WHERE to_ping <> '' AND post_status = 'publish'");
+    if ( is_array($trackbacks) )
+        foreach ( $trackbacks as $trackback )
+            do_trackbacks($trackback);
+    //Do Update Services/Generic Pings
+    generic_ping();
+}
+/**
+ * Perform trackbacks.
+ *
+ * @since 1.5.0
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param int $post_id Post ID to do trackbacks on.
+ */
+function do_trackbacks($post_id) {
+    global $wpdb;
+    $post = get_post( $post_id );
+    $to_ping = get_to_ping($post_id);
+    $pinged  = get_pung($post_id);
+    if ( empty($to_ping) ) {
+        $wpdb->update($wpdb->posts, array('to_ping' => ''), array('ID' => $post_id) );
+        return;
+    }
+    if ( empty($post->post_excerpt) ) {
+        /** This filter is documented in wp-includes/post-template.php */
+        $excerpt = apply_filters( 'the_content', $post->post_content, $post->ID );
+    } else {
+        /** This filter is documented in wp-includes/post-template.php */
+        $excerpt = apply_filters( 'the_excerpt', $post->post_excerpt );
+    }
+    $excerpt = str_replace(']]>', ']]&gt;', $excerpt);
+    $excerpt = wp_html_excerpt($excerpt, 252, '&#8230;');
+    /** This filter is documented in wp-includes/post-template.php */
+    $post_title = apply_filters( 'the_title', $post->post_title, $post->ID );
+    $post_title = strip_tags($post_title);
+    if ( $to_ping ) {
+        foreach ( (array) $to_ping as $tb_ping ) {
+            $tb_ping = trim($tb_ping);
+            if ( !in_array($tb_ping, $pinged) ) {
+                trackback($tb_ping, $post_title, $excerpt, $post_id);
+                $pinged[] = $tb_ping;
+            } else {
+                $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, %s, '')) WHERE ID = %d", $tb_ping, $post_id) );
+            }
+        }
+    }
+}
+/**
+ * Sends pings to all of the ping site services.
+ *
+ * @since 1.2.0
+ *
+ * @param int $post_id Post ID.
+ * @return int Same as Post ID from parameter
+ */
+function generic_ping( $post_id = 0 ) {
+    $services = get_option('ping_sites');
+    $services = explode("\n", $services);
+    foreach ( (array) $services as $service ) {
+        $service = trim($service);
+        if ( '' != $service )
+            weblog_ping($service);
+    }
+    return $post_id;
+}
+/**
+ * Pings back the links found in a post.
+ *
+ * @since 0.71
+ *
+ * @global string $wp_version
+ *
+ * @param string $content Post content to check for links.
+ * @param int $post_ID Post ID.
+ */
+function pingback($content, $post_ID) {
+    global $wp_version;
+    include_once(ABSPATH . WPINC . '/class-IXR.php');
+    include_once(ABSPATH . WPINC . '/class-wp-http-ixr-client.php');
+    // original code by Mort (http://mort.mine.nu:8080)
+    $post_links = array();
+    $pung = get_pung($post_ID);
+    // Step 1
+    // Parsing the post, external links (if any) are stored in the $post_links array
+    $post_links_temp = wp_extract_urls( $content );
+    // Step 2.
+    // Walking thru the links array
+    // first we get rid of links pointing to sites, not to specific files
+    // Example:
+    // http://dummy-weblog.org
+    // http://dummy-weblog.org/
+    // http://dummy-weblog.org/post.php
+    // We don't wanna ping first and second types, even if they have a valid <link/>
+    foreach ( (array) $post_links_temp as $link_test ) :
+        if ( !in_array($link_test, $pung) && (url_to_postid($link_test) != $post_ID) // If we haven't pung it already and it isn't a link to itself
+                && !is_local_attachment($link_test) ) : // Also, let's never ping local attachments.
+            if ( $test = @parse_url($link_test) ) {
+                if ( isset($test['query']) )
+                    $post_links[] = $link_test;
+                elseif ( isset( $test['path'] ) && ( $test['path'] != '/' ) && ( $test['path'] != '' ) )
+                    $post_links[] = $link_test;
+            }
+        endif;
+    endforeach;
+    $post_links = array_unique( $post_links );
+    /**
+     * Fires just before pinging back links found in a post.
+     *
+     * @since 2.0.0
+     *
+     * @param array &$post_links An array of post links to be checked, passed by reference.
+     * @param array &$pung       Whether a link has already been pinged, passed by reference.
+     * @param int   $post_ID     The post ID.
+     */
+    do_action_ref_array( 'pre_ping', array( &$post_links, &$pung, $post_ID ) );
+    foreach ( (array) $post_links as $pagelinkedto ) {
+        $pingback_server_url = discover_pingback_server_uri( $pagelinkedto );
+        if ( $pingback_server_url ) {
+            @ set_time_limit( 60 );
+            // Now, the RPC call
+            $pagelinkedfrom = get_permalink($post_ID);
+            // using a timeout of 3 seconds should be enough to cover slow servers
+            $client = new WP_HTTP_IXR_Client($pingback_server_url);
+            $client->timeout = 3;
+            /**
+             * Filter the user agent sent when pinging-back a URL.
+             *
+             * @since 2.9.0
+             *
+             * @param string $concat_useragent    The user agent concatenated with ' -- WordPress/'
+             *                                    and the WordPress version.
+             * @param string $useragent           The useragent.
+             * @param string $pingback_server_url The server URL being linked to.
+             * @param string $pagelinkedto        URL of page linked to.
+             * @param string $pagelinkedfrom      URL of page linked from.
+             */
+            $client->useragent = apply_filters( 'pingback_useragent', $client->useragent . ' -- WordPress/' . $wp_version, $client->useragent, $pingback_server_url, $pagelinkedto, $pagelinkedfrom );
+            // when set to true, this outputs debug messages by itself
+            $client->debug = false;
+            if ( $client->query('pingback.ping', $pagelinkedfrom, $pagelinkedto) || ( isset($client->error->code) && 48 == $client->error->code ) ) // Already registered
+                add_ping( $post_ID, $pagelinkedto );
+        }
+    }
+}
+/**
+ * Check whether blog is public before returning sites.
+ *
+ * @since 2.1.0
+ *
+ * @param mixed $sites Will return if blog is public, will not return if not public.
+ * @return mixed Empty string if blog is not public, returns $sites, if site is public.
+ */
+function privacy_ping_filter($sites) {
+    if ( '0' != get_option('blog_public') )
+        return $sites;
+    else
+        return '';
+}
+/**
+ * Send a Trackback.
+ *
+ * Updates database when sending trackback to prevent duplicates.
+ *
+ * @since 0.71
+ *
+ * @global wpdb $wpdb WordPress database abstraction object.
+ *
+ * @param string $trackback_url URL to send trackbacks.
+ * @param string $title Title of post.
+ * @param string $excerpt Excerpt of post.
+ * @param int $ID Post ID.
+ * @return int|false|void Database query from update.
+ */
+function trackback($trackback_url, $title, $excerpt, $ID) {
+    global $wpdb;
+    if ( empty($trackback_url) )
+        return;
+    $options = array();
+    $options['timeout'] = 4;
+    $options['body'] = array(
+        'title' => $title,
+        'url' => get_permalink($ID),
+        'blog_name' => get_option('blogname'),
+        'excerpt' => $excerpt
+    );
+    $response = wp_safe_remote_post( $trackback_url, $options );
+    if ( is_wp_error( $response ) )
+        return;
+    $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET pinged = CONCAT(pinged, '\n', %s) WHERE ID = %d", $trackback_url, $ID) );
+    return $wpdb->query( $wpdb->prepare("UPDATE $wpdb->posts SET to_ping = TRIM(REPLACE(to_ping, %s, '')) WHERE ID = %d", $trackback_url, $ID) );
+}
+/**
+ * Send a pingback.
+ *
+ * @since 1.2.0
+ *
+ * @global string $wp_version
+ *
+ * @param string $server Host of blog to connect to.
+ * @param string $path Path to send the ping.
+ */
+function weblog_ping($server = '', $path = '') {
+    global $wp_version;
+    include_once(ABSPATH . WPINC . '/class-IXR.php');
+    include_once(ABSPATH . WPINC . '/class-wp-http-ixr-client.php');
+    // using a timeout of 3 seconds should be enough to cover slow servers
+    $client = new WP_HTTP_IXR_Client($server, ((!strlen(trim($path)) || ('/' == $path)) ? false : $path));
+    $client->timeout = 3;
+    $client->useragent .= ' -- WordPress/'.$wp_version;
+    // when set to true, this outputs debug messages by itself
+    $client->debug = false;
+    $home = trailingslashit( home_url() );
+    if ( !$client->query('weblogUpdates.extendedPing', get_option('blogname'), $home, get_bloginfo('rss2_url') ) ) // then try a normal ping
+        $client->query('weblogUpdates.ping', get_option('blogname'), $home);
+}
+/**
+ * Default filter attached to pingback_ping_source_uri to validate the pingback's Source URI
+ *
+ * @since 3.5.1
+ * @see wp_http_validate_url()
+ *
+ * @param string $source_uri
+ * @return string
+ */
+function pingback_ping_source_uri( $source_uri ) {
+    return (string) wp_http_validate_url( $source_uri );
+}
+/**
+ * Default filter attached to xmlrpc_pingback_error.
+ *
+ * Returns a generic pingback error code unless the error code is 48,
+ * which reports that the pingback is already registered.
+ *
+ * @since 3.5.1
+ * @link http://www.hixie.ch/specs/pingback/pingback#TOC3
+ *
+ * @param IXR_Error $ixr_error
+ * @return IXR_Error
+ */
+function xmlrpc_pingback_error( $ixr_error ) {
+    if ( $ixr_error->code === 48 )
+        return $ixr_error;
+    return new IXR_Error( 0, '' );
+}
+//
+// Cache
+//
+/**
+ * Removes comment ID from the comment cache.
+ *
+ * @since 2.3.0
+ *
+ * @param int|array $ids Comment ID or array of comment IDs to remove from cache
+ */
+function clean_comment_cache($ids) {
+    foreach ( (array) $ids as $id )
+        wp_cache_delete($id, 'comment');
+    wp_cache_set( 'last_changed', microtime(), 'comment' );
+}
+/**
+ * Updates the comment cache of given comments.
+ *
+ * Will add the comments in $comments to the cache. If comment ID already exists
+ * in the comment cache then it will not be updated. The comment is added to the
+ * cache using the comment group with the key using the ID of the comments.
+ *
+ * @since 2.3.0
+ *
+ * @param array $comments Array of comment row objects
+ */
+function update_comment_cache($comments) {
+    foreach ( (array) $comments as $comment )
+        wp_cache_add($comment->comment_ID, $comment, 'comment');
+}
+//
+// Internal
+//
+/**
+ * Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.
+ *
+ * @access private
+ * @since 2.7.0
+ *
+ * @param WP_Post  $posts Post data object.
+ * @param WP_Query $query Query object.
+ * @return array
+ */
+function _close_comments_for_old_posts( $posts, $query ) {
+    if ( empty( $posts ) || ! $query->is_singular() || ! get_option( 'close_comments_for_old_posts' ) )
+        return $posts;
+    /**
+     * Filter the list of post types to automatically close comments for.
+     *
+     * @since 3.2.0
+     *
+     * @param array $post_types An array of registered post types. Default array with 'post'.
+     */
+    $post_types = apply_filters( 'close_comments_for_post_types', array( 'post' ) );
+    if ( ! in_array( $posts[0]->post_type, $post_types ) )
+        return $posts;
+    $days_old = (int) get_option( 'close_comments_days_old' );
+    if ( ! $days_old )
+        return $posts;
+    if ( time() - strtotime( $posts[0]->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) ) {
+        $posts[0]->comment_status = 'closed';
+        $posts[0]->ping_status = 'closed';
+    }
+    return $posts;
+}
+/**
+ * Close comments on an old post. Hooked to comments_open and pings_open.
+ *
+ * @access private
+ * @since 2.7.0
+ *
+ * @param bool $open Comments open or closed
+ * @param int $post_id Post ID
+ * @return bool $open
+ */
+function _close_comments_for_old_post( $open, $post_id ) {
+    if ( ! $open )
+        return $open;
+    if ( !get_option('close_comments_for_old_posts') )
+        return $open;
+    $days_old = (int) get_option('close_comments_days_old');
+    if ( !$days_old )
+        return $open;
+    $post = get_post($post_id);
+    /** This filter is documented in wp-includes/comment.php */
+    $post_types = apply_filters( 'close_comments_for_post_types', array( 'post' ) );
+    if ( ! in_array( $post->post_type, $post_types ) )
+        return $open;
+    if ( time() - strtotime( $post->post_date_gmt ) > ( $days_old * DAY_IN_SECONDS ) )
+        return false;
+    return $open;
+}
+require_once( ABSPATH . WPINC . '/class-wp-comment-query.php' );
+require_once( ABSPATH . WPINC . '/comment-functions.php' );

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Changeset 33750 for trunk/src/wp-includes/comment.php

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trunk/src/wp-includes/comment.php

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