Summery Summery
Creates a revision for the current version of a post.
Syntax Syntax
Description Description
Typically used immediately after a post update, as every update is a revision, and the most recent revision always matches the current post.
Parameters Parameters
- $post_id
-
(Required) The ID of the post to save as a revision.
Return Return
(int|WP_Error|void) Void or 0 if error, new revision ID, if success.
Source Source
File: wp-includes/revision.php
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 last revision, but not an autosave. foreach ( $revisions as $revision ) { if ( false !== strpos( $revision->post_name, "{$revision->post_parent}-revision" ) ) { $last_revision = $revision; break; } } /** * Filters whether the post has changed since the last 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 $last_revision The last revision post object. * @param WP_Post $post The post object. */ if ( isset( $last_revision ) && apply_filters( 'wp_save_post_revision_check_for_changes', true, $last_revision, $post ) ) { $post_has_changed = false; foreach ( array_keys( _wp_post_revision_fields( $post ) ) as $field ) { if ( normalize_whitespace( $post->$field ) !== normalize_whitespace( $last_revision->$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 $last_revision The last 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, $last_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' ) ); $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 ( false !== strpos( $revisions[ $i ]->post_name, 'autosave' ) ) { continue; } wp_delete_post_revision( $revisions[ $i ]->ID ); } return $return; } /**
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Changelog Changelog
Version | Description |
---|---|
2.6.0 | Introduced. |