wp_save_post_revision( int $post_id ): int|WP_Error|void

Source

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; } 

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