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revision.php
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<?php /** * Post revision functions. * * @package WordPress * @subpackage Post_Revisions */ /** * Determines which fields of posts are to be saved in revisions. * * @since 2.6.0 * @since 4.5.0 A `WP_Post` object can now be passed to the `$post` parameter. * @since 4.5.0 The optional `$autosave` parameter was deprecated and renamed to `$deprecated`. * @access private * * @param array|WP_Post $post Optional. A post array or a WP_Post object being processed * for insertion as a post revision. Default empty array. * @param bool $deprecated Not used. * @return string[] Array of fields that can be versioned. */ function _wp_post_revision_fields( $post = array(), $deprecated = false ) { static $fields = null; if ( ! is_array( $post ) ) { $post = get_post( $post, ARRAY_A ); } if ( is_null( $fields ) ) { // Allow these to be versioned. $fields = array( 'post_title' => __( 'Title' ), 'post_content' => __( 'Content' ), 'post_excerpt' => __( 'Excerpt' ), ); } /** * Filters the list of fields saved in post revisions. * * Included by default: 'post_title', 'post_content' and 'post_excerpt'. * * Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date', * 'post_date_gmt', 'post_status', 'post_type', 'comment_count', * and 'post_author'. * * @since 2.6.0 * @since 4.5.0 The `$post` parameter was added. * * @param string[] $fields List of fields to revision. Contains 'post_title', * 'post_content', and 'post_excerpt' by default. * @param array $post A post array being processed for insertion as a post revision. */ $fields = apply_filters( '_wp_post_revision_fields', $fields, $post ); // WP uses these internally either in versioning or elsewhere - they cannot be versioned. foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) { unset( $fields[ $protect ] ); } return $fields; } /** * Returns a post array ready to be inserted into the posts table as a post revision. * * @since 4.5.0 * @access private * * @param array|WP_Post $post Optional. A post array or a WP_Post object to be processed * for insertion as a post revision. Default empty array. * @param bool $autosave Optional. Is the revision an autosave? Default false. * @return array Post array ready to be inserted as a post revision. */ function _wp_post_revision_data( $post = array(), $autosave = false ) { if ( ! is_array( $post ) ) { $post = get_post( $post, ARRAY_A ); } $fields = _wp_post_revision_fields( $post ); $revision_data = array(); foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) { $revision_data[ $field ] = $post[ $field ]; } $revision_data['post_parent'] = $post['ID']; $revision_data['post_status'] = 'inherit'; $revision_data['post_type'] = 'revision'; $revision_data['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version. $revision_data['post_date'] = isset( $post['post_modified'] ) ? $post['post_modified'] : ''; $revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : ''; return $revision_data; } /** * Saves revisions for a post after all changes have been made. * * @since 6.4.0 * * @param int $post_id The post id that was inserted. * @param WP_Post $post The post object that was inserted. * @param bool $update Whether this insert is updating an existing post. */ function wp_save_post_revision_on_insert( $post_id, $post, $update ) { if ( ! $update ) { return; } if ( ! has_action( 'post_updated', 'wp_save_post_revision' ) ) { return; } wp_save_post_revision( $post_id ); } /** * Creates a revision for the current version of a post. * * Typically used immediately after a post update, as every update is a revision, * and the most recent revision always matches the current post. * * @since 2.6.0 * * @param int $post_id The ID of the post to save as a revision. * @return int|WP_Error|void Void or 0 if error, new revision ID, if success. */ function wp_save_post_revision( $post_id ) { if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) { return; } // Prevent saving post revisions if revisions should be saved on wp_after_insert_post. if ( doing_action( 'post_updated' ) && has_action( 'wp_after_insert_post', 'wp_save_post_revision_on_insert' ) ) { return; } $post = get_post( $post_id ); if ( ! $post ) { return; } if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { return; } if ( 'auto-draft' === $post->post_status ) { return; } if ( ! wp_revisions_enabled( $post ) ) { return; } /* * Compare the proposed update with the last stored revision verifying that * they are different, unless a plugin tells us to always save regardless. * If no previous revisions, save one. */ $revisions = wp_get_post_revisions( $post_id ); if ( $revisions ) { // Grab the latest revision, but not an autosave. foreach ( $revisions as $revision ) { if ( str_contains( $revision->post_name, "{$revision->post_parent}-revision" ) ) { $latest_revision = $revision; break; } } /** * Filters whether the post has changed since the latest revision. * * By default a revision is saved only if one of the revisioned fields has changed. * This filter can override that so a revision is saved even if nothing has changed. * * @since 3.6.0 * * @param bool $check_for_changes Whether to check for changes before saving a new revision. * Default true. * @param WP_Post $latest_revision The latest revision post object. * @param WP_Post $post The post object. */ if ( isset( $latest_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $latest_revision, $post ) ) { $post_has_changed = false; foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) { if ( normalize_whitespace( $post->$field ) !== normalize_whitespace( $latest_revision->$field ) ) { $post_has_changed = true; break; } } /** * Filters whether a post has changed. * * By default a revision is saved only if one of the revisioned fields has changed. * This filter allows for additional checks to determine if there were changes. * * @since 4.1.0 * * @param bool $post_has_changed Whether the post has changed. * @param WP_Post $latest_revision The latest revision post object. * @param WP_Post $post The post object. */ $post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $latest_revision, $post ); // Don't save revision if post unchanged. if ( ! $post_has_changed ) { return; } } } $return = _wp_put_post_revision( $post ); /* * If a limit for the number of revisions to keep has been set, * delete the oldest ones. */ $revisions_to_keep = wp_revisions_to_keep( $post ); if ( $revisions_to_keep < 0 ) { return $return; } $revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) ); /** * Filters the revisions to be considered for deletion. * * @since 6.2.0 * * @param WP_Post[] $revisions Array of revisions, or an empty array if none. * @param int $post_id The ID of the post to save as a revision. */ $revisions = apply_filters( 'wp_save_post_revision_revisions_before_deletion', $revisions, $post_id ); $delete = count( $revisions ) - $revisions_to_keep; if ( $delete < 1 ) { return $return; } $revisions = array_slice( $revisions, 0, $delete ); for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) { if ( str_contains( $revisions[ $i ]->post_name, 'autosave' ) ) { continue; } wp_delete_post_revision( $revisions[ $i ]->ID ); } return $return; } /** * Retrieves the autosaved data of the specified post. * * Returns a post object with the information that was autosaved for the specified post. * If the optional $user_id is passed, returns the autosave for that user, otherwise * returns the latest autosave. * * @since 2.6.0 * * @param int $post_id The post ID. * @param int $user_id Optional. The post author ID. Default 0. * @return WP_Post|false The autosaved data or false on failure or when no autosave exists. */ function wp_get_post_autosave( $post_id, $user_id = 0 ) { $args = array( 'post_type' => 'revision', 'post_status' => 'inherit', 'post_parent' => $post_id, 'name' => $post_id . '-autosave-v1', 'posts_per_page' => 1, 'orderby' => 'date', 'order' => 'DESC', 'fields' => 'ids', 'no_found_rows' => true, ); if ( 0 !== $user_id ) { $args['author'] = $user_id; } $query = new WP_Query( $args ); if ( ! $query->have_posts() ) { return false; } return get_post( $query->posts[0] ); } /** * Determines if the specified post is a revision. * * @since 2.6.0 * * @param int|WP_Post $post Post ID or post object. * @return int|false ID of revision's parent on success, false if not a revision. */ function wp_is_post_revision( $post ) { $post = wp_get_post_revision( $post ); if ( ! $post ) { return false; } return (int) $post->post_parent; } /** * Determines if the specified post is an autosave. * * @since 2.6.0 * * @param int|WP_Post $post Post ID or post object. * @return int|false ID of autosave's parent on success, false if not a revision. */ function wp_is_post_autosave( $post ) { $post = wp_get_post_revision( $post ); if ( ! $post ) { return false; } if ( str_contains( $post->post_name, "{$post->post_parent}-autosave" ) ) { return (int) $post->post_parent; } return false; } /** * Inserts post data into the posts table as a post revision. * * @since 2.6.0 * @access private * * @param int|WP_Post|array|null $post Post ID, post object OR post array. * @param bool $autosave Optional. Whether the revision is an autosave or not. * Default false. * @return int|WP_Error WP_Error or 0 if error, new revision ID if success. */ function _wp_put_post_revision( $post = null, $autosave = false ) { if ( is_object( $post ) ) { $post = get_object_vars( $post ); } elseif ( ! is_array( $post ) ) { $post = get_post( $post, ARRAY_A ); } if ( ! $post || empty( $post['ID'] ) ) { return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) ); } if ( isset( $post['post_type'] ) && 'revision' === $post['post_type'] ) { return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) ); } $post = _wp_post_revision_data( $post, $autosave ); $post = wp_slash( $post ); // Since data is from DB. $revision_id = wp_insert_post( $post, true ); if ( is_wp_error( $revision_id ) ) { return $revision_id; } if ( $revision_id ) { /** * Fires once a revision has been saved. * * @since 2.6.0 * @since 6.4.0 The post_id parameter was added. * * @param int $revision_id Post revision ID. * @param int $post_id Post ID. */ do_action( '_wp_put_post_revision', $revision_id, $post['post_parent'] ); } return $revision_id; } /** * Save the revisioned meta fields. * * @since 6.4.0 * * @param int $revision_id The ID of the revision to save the meta to. * @param int $post_id The ID of the post the revision is associated with. */ function wp_save_revisioned_meta_fields( $revision_id, $post_id ) { $post_type = get_post_type( $post_id ); if ( ! $post_type ) { return; } foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) { if ( metadata_exists( 'post', $post_id, $meta_key ) ) { _wp_copy_post_meta( $post_id, $revision_id, $meta_key ); } } } /** * Gets a post revision. * * @since 2.6.0 * * @param int|WP_Post $post Post ID or post object. * @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which * correspond to a WP_Post object, an associative array, or a numeric array, * respectively. Default OBJECT. * @param string $filter Optional sanitization filter. See sanitize_post(). Default 'raw'. * @return WP_Post|array|null WP_Post (or array) on success, or null on failure. */ function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) { $revision = get_post( $post, OBJECT, $filter ); if ( ! $revision ) { return $revision; } if ( 'revision' !== $revision->post_type ) { return null; } if ( OBJECT === $output ) { return $revision; } elseif ( ARRAY_A === $output ) { $_revision = get_object_vars( $revision ); return $_revision; } elseif ( ARRAY_N === $output ) { $_revision = array_values( get_object_vars( $revision ) ); return $_revision; } return $revision; } /** * Restores a post to the specified revision. * * Can restore a past revision using all fields of the post revision, or only selected fields. * * @since 2.6.0 * * @param int|WP_Post $revision Revision ID or revision object. * @param array $fields Optional. What fields to restore from. Defaults to all. * @return int|false|null Null if error, false if no fields to restore, (int) post ID if success. */ function wp_restore_post_revision( $revision, $fields = null ) { $revision = wp_get_post_revision( $revision, ARRAY_A ); if ( ! $revision ) { return $revision; } if ( ! is_array( $fields ) ) { $fields = array_keys( _wp_post_revision_fields( $revision ) ); } $update = array(); foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) { $update[ $field ] = $revision[ $field ]; } if ( ! $update ) { return false; } $update['ID'] = $revision['post_parent']; $update = wp_slash( $update ); // Since data is from DB. $post_id = wp_update_post( $update ); if ( ! $post_id || is_wp_error( $post_id ) ) { return $post_id; } // Update last edit user. update_post_meta( $post_id, '_edit_last', get_current_user_id() ); /** * Fires after a post revision has been restored. * * @since 2.6.0 * * @param int $post_id Post ID. * @param int $revision_id Post revision ID. */ do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] ); return $post_id; } /** * Restore the revisioned meta values for a post. * * @since 6.4.0 * * @param int $post_id The ID of the post to restore the meta to. * @param int $revision_id The ID of the revision to restore the meta from. */ function wp_restore_post_revision_meta( $post_id, $revision_id ) { $post_type = get_post_type( $post_id ); if ( ! $post_type ) { return; } // Restore revisioned meta fields. foreach ( wp_post_revision_meta_keys( $post_type ) as $meta_key ) { // Clear any existing meta. delete_post_meta( $post_id, $meta_key ); _wp_copy_post_meta( $revision_id, $post_id, $meta_key ); } } /** * Copy post meta for the given key from one post to another. * * @since 6.4.0 * * @param int $source_post_id Post ID to copy meta value(s) from. * @param int $target_post_id Post ID to copy meta value(s) to. * @param string $meta_key Meta key to copy. */ function _wp_copy_post_meta( $source_post_id, $target_post_id, $meta_key ) { foreach ( get_post_meta( $source_post_id, $meta_key ) as $meta_value ) { /** * We use add_metadata() function vs add_post_meta() here * to allow for a revision post target OR regular post. */ add_metadata( 'post', $target_post_id, $meta_key, wp_slash( $meta_value ) ); } } /** * Determine which post meta fields should be revisioned. * * @since 6.4.0 * * @param string $post_type The post type being revisioned. * @return array An array of meta keys to be revisioned. */ function wp_post_revision_meta_keys( $post_type ) { $registered_meta = array_merge( get_registered_meta_keys( 'post' ), get_registered_meta_keys( 'post', $post_type ) ); $wp_revisioned_meta_keys = array(); foreach ( $registered_meta as $name => $args ) { if ( $args['revisions_enabled'] ) { $wp_revisioned_meta_keys[ $name ] = true; } } $wp_revisioned_meta_keys = array_keys( $wp_revisioned_meta_keys ); /** * Filter the list of post meta keys to be revisioned. * * @since 6.4.0 * * @param array $keys An array of meta fields to be revisioned. * @param string $post_type The post type being revisioned. */ return apply_filters( 'wp_post_revision_meta_keys', $wp_revisioned_meta_keys, $post_type ); } /** * Check whether revisioned post meta fields have changed. * * @since 6.4.0 * * @param bool $post_has_changed Whether the post has changed. * @param WP_Post $last_revision The last revision post object. * @param WP_Post $post The post object. * @return bool Whether the post has changed. */ function wp_check_revisioned_meta_fields_have_changed( $post_has_changed, WP_Post $last_revision, WP_Post $post ) { foreach ( wp_post_revision_meta_keys( $post->post_type ) as $meta_key ) { if ( get_post_meta( $post->ID, $meta_key ) !== get_post_meta( $last_revision->ID, $meta_key ) ) { $post_has_changed = true; break; } } return $post_has_changed; } /** * Deletes a revision. * * Deletes the row from the posts table corresponding to the specified revision. * * @since 2.6.0 * * @param int|WP_Post $revision Revision ID or revision object. * @return WP_Post|false|null Null or false if error, deleted post object if success. */ function wp_delete_post_revision( $revision ) { $revision = wp_get_post_revision( $revision ); if ( ! $revision ) { return $revision; } $delete = wp_delete_post( $revision->ID ); if ( $delete ) { /** * Fires once a post revision has been deleted. * * @since 2.6.0 * * @param int $revision_id Post revision ID. * @param WP_Post $revision Post revision object. */ do_action( 'wp_delete_post_revision', $revision->ID, $revision ); } return $delete; } /** * Returns all revisions of specified post. * * @since 2.6.0 * * @see get_children() * * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. * @param array|null $args Optional. Arguments for retrieving post revisions. Default null. * @return WP_Post[]|int[] Array of revision objects or IDs, or an empty array if none. */ function wp_get_post_revisions( $post = 0, $args = null ) { $post = get_post( $post ); if ( ! $post || empty( $post->ID ) ) { return array(); } $defaults = array( 'order' => 'DESC', 'orderby' => 'date ID', 'check_enabled' => true, ); $args = wp_parse_args( $args, $defaults ); if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) { return array(); } $args = array_merge( $args, array( 'post_parent' => $post->ID, 'post_type' => 'revision', 'post_status' => 'inherit', ) ); $revisions = get_children( $args ); if ( ! $revisions ) { return array(); } return $revisions; } /** * Returns the latest revision ID and count of revisions for a post. * * @since 6.1.0 * * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post. * @return array|WP_Error { * Returns associative array with latest revision ID and total count, * or a WP_Error if the post does not exist or revisions are not enabled. * * @type int $latest_id The latest revision post ID or 0 if no revisions exist. * @type int $count The total count of revisions for the given post. * } */ function wp_get_latest_revision_id_and_total_count( $post = 0 ) { $post = get_post( $post ); if ( ! $post ) { return new WP_Error( 'invalid_post', __( 'Invalid post.' ) ); } if ( ! wp_revisions_enabled( $post ) ) { return new WP_Error( 'revisions_not_enabled', __( 'Revisions not enabled.' ) ); } $args = array( 'post_parent' => $post->ID, 'fields' => 'ids', 'post_type' => 'revision', 'post_status' => 'inherit', 'order' => 'DESC', 'orderby' => 'date ID', 'posts_per_page' => 1, 'ignore_sticky_posts' => true, ); $revision_query = new WP_Query(); $revisions = $revision_query->query( $args ); if ( ! $revisions ) { return array( 'latest_id' => 0, 'count' => 0, ); } return array( 'latest_id' => $revisions[0], 'count' => $revision_query->found_posts, ); } /** * Returns the url for viewing and potentially restoring revisions of a given post. * * @since 5.9.0 * * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. * @return string|null The URL for editing revisions on the given post, otherwise null. */ function wp_get_post_revisions_url( $post = 0 ) { $post = get_post( $post ); if ( ! $post instanceof WP_Post ) { return null; } // If the post is a revision, return early. if ( 'revision' === $post->post_type ) { return get_edit_post_link( $post ); } if ( ! wp_revisions_enabled( $post ) ) { return null; } $revisions = wp_get_latest_revision_id_and_total_count( $post->ID ); if ( is_wp_error( $revisions ) || 0 === $revisions['count'] ) { return null; } return get_edit_post_link( $revisions['latest_id'] ); } /** * Determines whether revisions are enabled for a given post. * * @since 3.6.0 * * @param WP_Post $post The post object. * @return bool True if number of revisions to keep isn't zero, false otherwise. */ function wp_revisions_enabled( $post ) { return wp_revisions_to_keep( $post ) !== 0; } /** * Determines how many revisions to retain for a given post. * * By default, an infinite number of revisions are kept. * * The constant WP_POST_REVISIONS can be set in wp-config to specify the limit * of revisions to keep. * * @since 3.6.0 * * @param WP_Post $post The post object. * @return int The number of revisions to keep. */ function wp_revisions_to_keep( $post ) { $num = WP_POST_REVISIONS; if ( true === $num ) { $num = -1; } else { $num = (int) $num; } if ( ! post_type_supports( $post->post_type, 'revisions' ) ) { $num = 0; } /** * Filters the number of revisions to save for the given post. * * Overrides the value of WP_POST_REVISIONS. * * @since 3.6.0 * * @param int $num Number of revisions to store. * @param WP_Post $post Post object. */ $num = apply_filters( 'wp_revisions_to_keep', $num, $post ); /** * Filters the number of revisions to save for the given post by its post type. * * Overrides both the value of WP_POST_REVISIONS and the {@see 'wp_revisions_to_keep'} filter. * * The dynamic portion of the hook name, `$post->post_type`, refers to * the post type slug. * * Possible hook names include: * * - `wp_post_revisions_to_keep` * - `wp_page_revisions_to_keep` * * @since 5.8.0 * * @param int $num Number of revisions to store. * @param WP_Post $post Post object. */ $num = apply_filters( "wp_{$post->post_type}_revisions_to_keep", $num, $post ); return (int) $num; } /** * Sets up the post object for preview based on the post autosave. * * @since 2.7.0 * @access private * * @param WP_Post $post * @return WP_Post|false */ function _set_preview( $post ) { if ( ! is_object( $post ) ) { return $post; } $preview = wp_get_post_autosave( $post->ID ); if ( is_object( $preview ) ) { $preview = sanitize_post( $preview ); $post->post_content = $preview->post_content; $post->post_title = $preview->post_title; $post->post_excerpt = $preview->post_excerpt; } add_filter( 'get_the_terms', '_wp_preview_terms_filter', 10, 3 ); add_filter( 'get_post_metadata', '_wp_preview_post_thumbnail_filter', 10, 3 ); add_filter( 'get_post_metadata', '_wp_preview_meta_filter', 10, 4 ); return $post; } /** * Filters the latest content for preview from the post autosave. * * @since 2.7.0 * @access private */ function _show_post_preview() { if ( isset( $_GET['preview_id'] ) && isset( $_GET['preview_nonce'] ) ) { $id = (int) $_GET['preview_id']; if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) ) { wp_die( __( 'Sorry, you are not allowed to preview drafts.' ), 403 ); } add_filter( 'the_preview', '_set_preview' ); } } /** * Filters terms lookup to set the post format. * * @since 3.6.0 * @access private * * @param array $terms * @param int $post_id * @param string $taxonomy * @return array */ function _wp_preview_terms_filter( $terms, $post_id, $taxonomy ) { $post = get_post(); if ( ! $post ) { return $terms; } if ( empty( $_REQUEST['post_format'] ) || $post->ID !== $post_id || 'post_format' !== $taxonomy || 'revision' === $post->post_type ) { return $terms; } if ( 'standard' === $_REQUEST['post_format'] ) { $terms = array(); } else { $term = get_term_by( 'slug', 'post-format-' . sanitize_key( $_REQUEST['post_format'] ), 'post_format' ); if ( $term ) { $terms = array( $term ); // Can only have one post format. } } return $terms; } /** * Filters post thumbnail lookup to set the post thumbnail. * * @since 4.6.0 * @access private * * @param null|array|string $value The value to return - a single metadata value, or an array of values. * @param int $post_id Post ID. * @param string $meta_key Meta key. * @return null|array The default return value or the post thumbnail meta array. */ function _wp_preview_post_thumbnail_filter( $value, $post_id, $meta_key ) { $post = get_post(); if ( ! $post ) { return $value; } if ( empty( $_REQUEST['_thumbnail_id'] ) || empty( $_REQUEST['preview_id'] ) || $post->ID !== $post_id || $post_id !== (int) $_REQUEST['preview_id'] || '_thumbnail_id' !== $meta_key || 'revision' === $post->post_type ) { return $value; } $thumbnail_id = (int) $_REQUEST['_thumbnail_id']; if ( $thumbnail_id <= 0 ) { return ''; } return (string) $thumbnail_id; } /** * Gets the post revision version. * * @since 3.6.0 * @access private * * @param WP_Post $revision * @return int|false */ function _wp_get_post_revision_version( $revision ) { if ( is_object( $revision ) ) { $revision = get_object_vars( $revision ); } elseif ( ! is_array( $revision ) ) { return false; } if ( preg_match( '/^\d+-(?:autosave|revision)-v(\d+)$/', $revision['post_name'], $matches ) ) { return (int) $matches[1]; } return 0; } /** * Upgrades the revisions author, adds the current post as a revision and sets the revisions version to 1. * * @since 3.6.0 * @access private * * @global wpdb $wpdb WordPress database abstraction object. * * @param WP_Post $post Post object. * @param array $revisions Current revisions of the post. * @return bool true if the revisions were upgraded, false if problems. */ function _wp_upgrade_revisions_of_post( $post, $revisions ) { global $wpdb; // Add post option exclusively. $lock = "revision-upgrade-{$post->ID}"; $now = time(); $result = $wpdb->query( $wpdb->prepare( "INSERT IGNORE INTO `$wpdb->options` (`option_name`, `option_value`, `autoload`) VALUES (%s, %s, 'off') /* LOCK */", $lock, $now ) ); if ( ! $result ) { // If we couldn't get a lock, see how old the previous lock is. $locked = get_option( $lock ); if ( ! $locked ) { /* * Can't write to the lock, and can't read the lock. * Something broken has happened. */ return false; } if ( $locked > $now - HOUR_IN_SECONDS ) { // Lock is not too old: some other process may be upgrading this post. Bail. return false; } // Lock is too old - update it (below) and continue. } // If we could get a lock, re-"add" the option to fire all the correct filters. update_option( $lock, $now ); reset( $revisions ); $add_last = true; do { $this_revision = current( $revisions ); $prev_revision = next( $revisions ); $this_revision_version = _wp_get_post_revision_version( $this_revision ); // Something terrible happened. if ( false === $this_revision_version ) { continue; } /* * 1 is the latest revision version, so we're already up to date. * No need to add a copy of the post as latest revision. */ if ( 0 < $this_revision_version ) { $add_last = false; continue; } // Always update the revision version. $update = array( 'post_name' => preg_replace( '/^(\d+-(?:autosave|revision))[\d-]*$/', '$1-v1', $this_revision->post_name ), ); /* * If this revision is the oldest revision of the post, i.e. no $prev_revision, * the correct post_author is probably $post->post_author, but that's only a good guess. * Update the revision version only and Leave the author as-is. */ if ( $prev_revision ) { $prev_revision_version = _wp_get_post_revision_version( $prev_revision ); // If the previous revision is already up to date, it no longer has the information we need :( if ( $prev_revision_version < 1 ) { $update['post_author'] = $prev_revision->post_author; } } // Upgrade this revision. $result = $wpdb->update( $wpdb->posts, $update, array( 'ID' => $this_revision->ID ) ); if ( $result ) { wp_cache_delete( $this_revision->ID, 'posts' ); } } while ( $prev_revision ); delete_option( $lock ); // Add a copy of the post as latest revision. if ( $add_last ) { wp_save_post_revision( $post->ID ); } return true; } /** * Filters preview post meta retrieval to get values from the autosave. * * Filters revisioned meta keys only. * * @since 6.4.0 * * @param mixed $value Meta value to filter. * @param int $object_id Object ID. * @param string $meta_key Meta key to filter a value for. * @param bool $single Whether to return a single value. * @return mixed Original meta value if the meta key isn't revisioned, the object doesn't exist, * the post type is a revision or the post ID doesn't match the object ID. * Otherwise, the revisioned meta value is returned for the preview. */ function _wp_preview_meta_filter( $value, $object_id, $meta_key, $single ) { $post = get_post(); if ( empty( $post ) || $post->ID !== $object_id || ! in_array( $meta_key, wp_post_revision_meta_keys( $post->post_type ), true ) || 'revision' === $post->post_type ) { return $value; } $preview = wp_get_post_autosave( $post->ID ); if ( false === $preview ) { return $value; } return get_post_meta( $preview->ID, $meta_key, $single ); }