+ * Moves a post or page to the Trash
+ *
+ * @since 2.9.0
+ * @uses do_action() on 'trash_post' before trashing
+ * @uses do_action() on 'trashed_post' after trashing
+ *
+ * @param int $postid Post ID.
+ * @return mixed False on failure
+ */
+function wp_trash_post($post_id = 0) {
+ if ( EMPTY_TRASH_DAYS == 0 )
+ return wp_delete_post($post_id);
+
+ if ( !$post = wp_get_single_post($post_id, ARRAY_A) )
+ return $post;
+
+ if ( $post['post_status'] == 'trash' )
+ return false;
+
+ do_action('trash_post', $post_id);
+
+ add_post_meta($post_id,'_wp_trash_meta_status', $post['post_status']);
+ add_post_meta($post_id,'_wp_trash_meta_time', time());
+
+ $post['post_status'] = 'trash';
+ wp_insert_post($post);
+
+ wp_trash_post_comments($post_id);
+
+ do_action('trashed_post', $post_id);
+
+ return $post;
+}
+
+/**
+ * Restores a post or page from the Trash
+ *
+ * @since 2.9.0
+ * @uses do_action() on 'untrash_post' before undeletion
+ * @uses do_action() on 'untrashed_post' after undeletion
+ *
+ * @param int $postid Post ID.
+ * @return mixed False on failure
+ */
+function wp_untrash_post($post_id = 0) {
+ if ( !$post = wp_get_single_post($post_id, ARRAY_A) )
+ return $post;
+
+ if ( $post['post_status'] != 'trash' )
+ return false;
+
+ do_action('untrash_post', $post_id);
+
+ $post_status = get_post_meta($post_id, '_wp_trash_meta_status', true);
+
+ $post['post_status'] = $post_status;
+
+ delete_post_meta($post_id, '_wp_trash_meta_status');
+ delete_post_meta($post_id, '_wp_trash_meta_time');
+
+ wp_insert_post($post);
+
+ wp_untrash_post_comments($post_id);
+
+ do_action('untrashed_post', $post_id);
+
+ return $post;
+}
+
+/**
+ * Moves comments for a post to the trash
+ *
+ * @since 2.9.0
+ * @uses do_action() on 'trash_post_comments' before trashing
+ * @uses do_action() on 'trashed_post_comments' after trashing
+ *
+ * @param int $post Post ID or object.
+ * @return mixed False on failure
+ */
+function wp_trash_post_comments($post = null) {
+ global $wpdb;
+
+ $post = get_post($post);
+ if ( empty($post) )
+ return;
+
+ $post_id = $post->ID;
+
+ do_action('trash_post_comments', $post_id);
+
+ $comments = $wpdb->get_results( $wpdb->prepare("SELECT comment_ID, comment_approved FROM $wpdb->comments WHERE comment_post_ID = %d", $post_id) );
+ if ( empty($comments) )
+ return;
+
+ // Cache current status for each comment
+ $statuses = array();
+ foreach ( $comments as $comment )
+ $statuses[$comment->comment_ID] = $comment->comment_approved;
+ add_post_meta($post_id, '_wp_trash_meta_comments_status', $statuses);
+
+ // Set status for all comments to post-trashed
+ $result = $wpdb->update($wpdb->comments, array('comment_approved' => 'post-trashed'), array('comment_post_ID' => $post_id));
+
+ clean_comment_cache( array_keys($statuses) );
+
+ do_action('trashed_post_comments', $post_id, $statuses);
+
+ return $result;
+}
+
+/**
+ * Restore comments for a post from the trash
+ *
+ * @since 2.9.0
+ * @uses do_action() on 'untrash_post_comments' before trashing
+ * @uses do_action() on 'untrashed_post_comments' after trashing
+ *
+ * @param int $post Post ID or object.
+ * @return mixed False on failure
+ */
+function wp_untrash_post_comments($post = null) {
+ global $wpdb;
+
+ $post = get_post($post);
+ if ( empty($post) )
+ return;
+
+ $post_id = $post->ID;
+
+ $statuses = get_post_meta($post_id, '_wp_trash_meta_comments_status', true);
+
+ if ( empty($statuses) )
+ return true;
+
+ do_action('untrash_post_comments', $post_id);
+
+ // Restore each comment to its original status
+ $group_by_status = array();
+ foreach ( $statuses as $comment_id => $comment_status )
+ $group_by_status[$comment_status][] = $comment_id;
+
+ foreach ( $group_by_status as $status => $comments ) {
+ // Sanity check. This shouldn't happen.
+ if ( 'post-trashed' == $status )
+ $status = '0';
+ $comments_in = implode( "', '", $comments );
+ $wpdb->query( "UPDATE $wpdb->comments SET comment_approved = '$status' WHERE comment_ID IN ('" . $comments_in . "')" );
+ }
+
+ clean_comment_cache( array_keys($statuses) );
+
+ delete_post_meta($post_id, '_wp_trash_meta_comments_status');
+
+ do_action('untrashed_post_comments', $post_id);
+}
+
+/**
+ * Retrieve the list of categories for a post.