<?php

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/**

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* Post revision functions.

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*

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* @package WordPress

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* @subpackage Post_Revisions

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*/

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/**

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* Determines which fields of posts are to be saved in revisions.

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*

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* @since 2.6.0

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* @since 4.5.0 A `WP_Post` object can now be passed to the `$post` parameter.

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* @since 4.5.0 The optional `$autosave` parameter was deprecated and renamed to `$deprecated`.

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* @access private

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*

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* @param array|WP_Post $post Optional. A post array or a WP_Post object being processed

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* for insertion as a post revision. Default empty array.

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* @param bool $deprecated Not used.

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* @return array Array of fields that can be versioned.

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*/

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function _wp_post_revision_fields( $post = array(), $deprecated = false ) {

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static $fields = null;

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if ( ! is_array( $post ) ) {

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$post = get_post( $post, ARRAY_A );

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}

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if ( is_null( $fields ) ) {

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// Allow these to be versioned.

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$fields = array(

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'post_title' => __( 'Title' ),

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'post_content' => __( 'Content' ),

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'post_excerpt' => __( 'Excerpt' ),

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);

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}

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/**

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* Filters the list of fields saved in post revisions.

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*

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* Included by default: 'post_title', 'post_content' and 'post_excerpt'.

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*

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* Disallowed fields: 'ID', 'post_name', 'post_parent', 'post_date',

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* 'post_date_gmt', 'post_status', 'post_type', 'comment_count',

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* and 'post_author'.

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*

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* @since 2.6.0

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* @since 4.5.0 The `$post` parameter was added.

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*

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* @param array $fields List of fields to revision. Contains 'post_title',

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* 'post_content', and 'post_excerpt' by default.

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* @param array $post A post array being processed for insertion as a post revision.

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*/

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$fields = apply_filters( '_wp_post_revision_fields', $fields, $post );

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// WP uses these internally either in versioning or elsewhere - they cannot be versioned.

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foreach ( array( 'ID', 'post_name', 'post_parent', 'post_date', 'post_date_gmt', 'post_status', 'post_type', 'comment_count', 'post_author' ) as $protect ) {

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unset( $fields[ $protect ] );

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}

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return $fields;

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}

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/**

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* Returns a post array ready to be inserted into the posts table as a post revision.

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*

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* @since 4.5.0

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* @access private

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*

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* @param array|WP_Post $post Optional. A post array or a WP_Post object to be processed

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* for insertion as a post revision. Default empty array.

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* @param bool $autosave Optional. Is the revision an autosave? Default false.

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* @return array Post array ready to be inserted as a post revision.

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*/

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function _wp_post_revision_data( $post = array(), $autosave = false ) {

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if ( ! is_array( $post ) ) {

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$post = get_post( $post, ARRAY_A );

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}

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$fields = _wp_post_revision_fields( $post );

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$revision_data = array();

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foreach ( array_intersect( array_keys( $post ), array_keys( $fields ) ) as $field ) {

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$revision_data[ $field ] = $post[ $field ];

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}

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$revision_data['post_parent'] = $post['ID'];

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$revision_data['post_status'] = 'inherit';

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$revision_data['post_type'] = 'revision';

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$revision_data['post_name'] = $autosave ? "$post[ID]-autosave-v1" : "$post[ID]-revision-v1"; // "1" is the revisioning system version.

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$revision_data['post_date'] = isset( $post['post_modified'] ) ? $post['post_modified'] : '';

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$revision_data['post_date_gmt'] = isset( $post['post_modified_gmt'] ) ? $post['post_modified_gmt'] : '';

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return $revision_data;

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}

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/**

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* Creates a revision for the current version of a post.

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*

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* Typically used immediately after a post update, as every update is a revision,

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* and the most recent revision always matches the current post.

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*

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* @since 2.6.0

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*

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* @param int $post_id The ID of the post to save as a revision.

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* @return int|WP_Error|void Void or 0 if error, new revision ID, if success.

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*/

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function wp_save_post_revision( $post_id ) {

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if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {

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return;

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}

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$post = get_post( $post_id );

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if ( ! $post ) {

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return;

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}

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if ( ! post_type_supports( $post->post_type, 'revisions' ) ) {

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return;

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}

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if ( 'auto-draft' === $post->post_status ) {

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return;

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}

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if ( ! wp_revisions_enabled( $post ) ) {

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return;

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}

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/*

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* Compare the proposed update with the last stored revision verifying that

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* they are different, unless a plugin tells us to always save regardless.

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* If no previous revisions, save one.

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*/

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$revisions = wp_get_post_revisions( $post_id );

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if ( $revisions ) {

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// Grab the last revision, but not an autosave.

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foreach ( $revisions as $revision ) {

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if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) {

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$last_revision = $revision;

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break;

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}

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}

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/**

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* Filters whether the post has changed since the last revision.

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*

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* By default a revision is saved only if one of the revisioned fields has changed.

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* This filter can override that so a revision is saved even if nothing has changed.

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*

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* @since 3.6.0

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*

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* @param bool $check_for_changes Whether to check for changes before saving a new revision.

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* Default true.

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* @param WP_Post $last_revision The last revision post object.

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* @param WP_Post $post The post object.

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*/

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if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) {

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$post_has_changed = false;

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foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) {

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if ( normalize_whitespace( $post->$field ) !== normalize_whitespace( $last_revision->$field ) ) {

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$post_has_changed = true;

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break;

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}

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}

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/**

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* Filters whether a post has changed.

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*

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* By default a revision is saved only if one of the revisioned fields has changed.

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* This filter allows for additional checks to determine if there were changes.

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*

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* @since 4.1.0

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*

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* @param bool $post_has_changed Whether the post has changed.

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* @param WP_Post $last_revision The last revision post object.

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* @param WP_Post $post The post object.

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*/

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$post_has_changed = (bool) apply_filters( 'wp_save_post_revision_post_has_changed', $post_has_changed, $last_revision, $post );

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// Don't save revision if post unchanged.

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if ( ! $post_has_changed ) {

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return;

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}

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}

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}

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$return = _wp_put_post_revision( $post );

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// If a limit for the number of revisions to keep has been set,

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// delete the oldest ones.

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$revisions_to_keep = wp_revisions_to_keep( $post );

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if ( $revisions_to_keep < 0 ) {

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return $return;

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}

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$revisions = wp_get_post_revisions( $post_id, array( 'order' => 'ASC' ) );

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$delete = count( $revisions ) - $revisions_to_keep;

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if ( $delete < 1 ) {

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return $return;

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}

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$revisions = array_slice( $revisions, 0, $delete );

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for ( $i = 0; isset( $revisions[ $i ] ); $i++ ) {

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if ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) {

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continue;

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}

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wp_delete_post_revision( $revisions[ $i ]->ID );

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}

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return $return;

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}

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/**

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* Retrieve the autosaved data of the specified post.

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*

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* Returns a post object with the information that was autosaved for the specified post.

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* If the optional $user_id is passed, returns the autosave for that user, otherwise

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* returns the latest autosave.

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*

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* @since 2.6.0

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*

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* @global wpdb $wpdb WordPress database abstraction object.

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*

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* @param int $post_id The post ID.

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* @param int $user_id Optional The post author ID.

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* @return WP_Post|false The autosaved data or false on failure or when no autosave exists.

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*/

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function wp_get_post_autosave( $post_id, $user_id = 0 ) {

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global $wpdb;

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$autosave_name = $post_id . '-autosave-v1';

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$user_id_query = ( 0 !== $user_id ) ? "AND post_author = $user_id" : null;

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// Construct the autosave query.

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$autosave_query = "

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SELECT *

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FROM $wpdb->posts

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WHERE post_parent = %d

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AND post_type = 'revision'

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AND post_status = 'inherit'

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AND post_name = %s " . $user_id_query . '

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ORDER BY post_date DESC

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LIMIT 1';

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$autosave = $wpdb->get_results(

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$wpdb->prepare(

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$autosave_query,

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$post_id,

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$autosave_name

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)

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);

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if ( ! $autosave ) {

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return false;

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}

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return get_post( $autosave[0] );

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}

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/**

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* Determines if the specified post is a revision.

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*

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* @since 2.6.0

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*

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* @param int|WP_Post $post Post ID or post object.

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* @return int|false ID of revision's parent on success, false if not a revision.

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*/

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function wp_is_post_revision( $post ) {

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$post = wp_get_post_revision( $post );

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if ( ! $post ) {

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return false;

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}

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return (int) $post->post_parent;

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}

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/**

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* Determines if the specified post is an autosave.

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*

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* @since 2.6.0

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*

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* @param int|WP_Post $post Post ID or post object.

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* @return int|false ID of autosave's parent on success, false if not a revision.

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*/

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function wp_is_post_autosave( $post ) {

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$post = wp_get_post_revision( $post );

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if ( ! $post ) {

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return false;

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}

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if ( false !== strpos( $post->post_name, "{$post->post_parent}-autosave" ) ) {

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return (int) $post->post_parent;

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}

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return false;

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}

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/**

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* Inserts post data into the posts table as a post revision.

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*

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* @since 2.6.0

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* @access private

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*

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* @param int|WP_Post|array|null $post Post ID, post object OR post array.

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* @param bool $autosave Optional. Is the revision an autosave?

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* @return int|WP_Error WP_Error or 0 if error, new revision ID if success.

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*/

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function _wp_put_post_revision( $post = null, $autosave = false ) {

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if ( is_object( $post ) ) {

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$post = get_object_vars( $post );

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} elseif ( ! is_array( $post ) ) {

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$post = get_post( $post, ARRAY_A );

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}

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if ( ! $post || empty( $post['ID'] ) ) {

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return new WP_Error( 'invalid_post', __( 'Invalid post ID.' ) );

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}

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if ( isset( $post['post_type'] ) && 'revision' === $post['post_type'] ) {

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return new WP_Error( 'post_type', __( 'Cannot create a revision of a revision' ) );

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}

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$post = _wp_post_revision_data( $post, $autosave );

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$post = wp_slash( $post ); // Since data is from DB.

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$revision_id = wp_insert_post( $post );

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if ( is_wp_error( $revision_id ) ) {

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return $revision_id;

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}

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if ( $revision_id ) {

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/**

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* Fires once a revision has been saved.

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*

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* @since 2.6.0

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*

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* @param int $revision_id Post revision ID.

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*/

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do_action( '_wp_put_post_revision', $revision_id );

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}

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return $revision_id;

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}

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/**

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* Gets a post revision.

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*

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* @since 2.6.0

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*

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* @param int|WP_Post $post The post ID or object.

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* @param string $output Optional. The required return type. One of OBJECT, ARRAY_A, or ARRAY_N, which

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* correspond to a WP_Post object, an associative array, or a numeric array,

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* respectively. Default OBJECT.

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* @param string $filter Optional sanitation filter. See sanitize_post().

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* @return WP_Post|array|null WP_Post (or array) on success, or null on failure.

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*/

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function wp_get_post_revision( &$post, $output = OBJECT, $filter = 'raw' ) {

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$revision = get_post( $post, OBJECT, $filter );

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if ( ! $revision ) {

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return $revision;

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}

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if ( 'revision' !== $revision->post_type ) {

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return null;

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}

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if ( OBJECT == $output ) {

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return $revision;

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} elseif ( ARRAY_A == $output ) {

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$_revision = get_object_vars( $revision );

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return $_revision;

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} elseif ( ARRAY_N == $output ) {

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$_revision = array_values( get_object_vars( $revision ) );

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return $_revision;

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}

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return $revision;

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}

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/**

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* Restores a post to the specified revision.

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*

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* Can restore a past revision using all fields of the post revision, or only selected fields.

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*

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* @since 2.6.0

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*

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* @param int|WP_Post $revision_id Revision ID or revision object.

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* @param array $fields Optional. What fields to restore from. Defaults to all.

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* @return int|false|null Null if error, false if no fields to restore, (int) post ID if success.

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*/

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function wp_restore_post_revision( $revision_id, $fields = null ) {

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$revision = wp_get_post_revision( $revision_id, ARRAY_A );

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if ( ! $revision ) {

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return $revision;

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}

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if ( ! is_array( $fields ) ) {

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$fields = array_keys( _wp_post_revision_fields( $revision ) );

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}

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$update = array();

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foreach ( array_intersect( array_keys( $revision ), $fields ) as $field ) {

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$update[ $field ] = $revision[ $field ];

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}

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if ( ! $update ) {

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return false;

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}

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$update['ID'] = $revision['post_parent'];

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$update = wp_slash( $update ); // Since data is from DB.

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$post_id = wp_update_post( $update );

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if ( ! $post_id || is_wp_error( $post_id ) ) {

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return $post_id;

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}

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// Update last edit user.

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update_post_meta( $post_id, '_edit_last', get_current_user_id() );

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/**

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* Fires after a post revision has been restored.

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*

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* @since 2.6.0

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*

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* @param int $post_id Post ID.

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* @param int $revision_id Post revision ID.

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*/

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do_action( 'wp_restore_post_revision', $post_id, $revision['ID'] );

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return $post_id;

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}

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/**

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* Deletes a revision.

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*

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* Deletes the row from the posts table corresponding to the specified revision.

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*

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* @since 2.6.0

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*

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* @param int|WP_Post $revision_id Revision ID or revision object.

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* @return array|false|WP_Post|WP_Error|null Null or WP_Error if error, deleted post if success.

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*/

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function wp_delete_post_revision( $revision_id ) {

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$revision = wp_get_post_revision( $revision_id );

[452] Fix | Delete

if ( ! $revision ) {

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return $revision;

[454] Fix | Delete

}

[455] Fix | Delete

[456] Fix | Delete

$delete = wp_delete_post( $revision->ID );

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if ( $delete ) {

[458] Fix | Delete

/**

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* Fires once a post revision has been deleted.

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*

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* @since 2.6.0

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*

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* @param int $revision_id Post revision ID.

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* @param WP_Post $revision Post revision object.

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*/

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do_action( 'wp_delete_post_revision', $revision->ID, $revision );

[467] Fix | Delete

}

[468] Fix | Delete

[469] Fix | Delete

return $delete;

[470] Fix | Delete

}

[471] Fix | Delete

[472] Fix | Delete

/**

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* Returns all revisions of specified post.

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*

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* @since 2.6.0

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*

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* @see get_children()

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*

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* @param int|WP_Post $post_id Optional. Post ID or WP_Post object. Default is global `$post`.

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* @param array|null $args Optional. Arguments for retrieving post revisions. Default null.

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* @return array An array of revisions, or an empty array if none.

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*/

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function wp_get_post_revisions( $post_id = 0, $args = null ) {

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$post = get_post( $post_id );

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if ( ! $post || empty( $post->ID ) ) {

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return array();

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}

[488] Fix | Delete

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$defaults = array(

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'order' => 'DESC',

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'orderby' => 'date ID',

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'check_enabled' => true,

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);

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$args = wp_parse_args( $args, $defaults );

[495] Fix | Delete

[496] Fix | Delete

if ( $args['check_enabled'] && ! wp_revisions_enabled( $post ) ) {

[497] Fix | Delete

return array();

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}

[499] Fix | Delete