WP_REST_Autosaves_Controller::create_post_autosave( array $post_data, array $meta = array() ): mixed

Source

public function create_post_autosave( $post_data, array $meta = array() ) {

	$post_id = (int) $post_data['ID'];
	$post    = get_post( $post_id );

	if ( is_wp_error( $post ) ) {
		return $post;
	}

	// Only create an autosave when it is different from the saved post.
	$autosave_is_different = false;
	$new_autosave          = _wp_post_revision_data( $post_data, true );

	foreach ( array_intersect( array_keys( $new_autosave ), array_keys( _wp_post_revision_fields( $post ) ) ) as $field ) {
		if ( normalize_whitespace( $new_autosave[ $field ] ) !== normalize_whitespace( $post->$field ) ) {
			$autosave_is_different = true;
			break;
		}
	}

	// Check if meta values have changed.
	if ( ! empty( $meta ) ) {
		$revisioned_meta_keys = wp_post_revision_meta_keys( $post->post_type );
		foreach ( $revisioned_meta_keys as $meta_key ) {
			// get_metadata_raw is used to avoid retrieving the default value.
			$old_meta = get_metadata_raw( 'post', $post_id, $meta_key, true );
			$new_meta = isset( $meta[ $meta_key ] ) ? $meta[ $meta_key ] : '';

			if ( $new_meta !== $old_meta ) {
				$autosave_is_different = true;
				break;
			}
		}
	}

	$user_id = get_current_user_id();

	// Store one autosave per author. If there is already an autosave, overwrite it.
	$old_autosave = wp_get_post_autosave( $post_id, $user_id );

	if ( ! $autosave_is_different && $old_autosave ) {
		// Nothing to save, return the existing autosave.
		return $old_autosave->ID;
	}

	if ( $old_autosave ) {
		$new_autosave['ID']          = $old_autosave->ID;
		$new_autosave['post_author'] = $user_id;

		/** This filter is documented in wp-admin/post.php */
		do_action( 'wp_creating_autosave', $new_autosave );

		// wp_update_post() expects escaped array.
		$revision_id = wp_update_post( wp_slash( $new_autosave ) );
	} else {
		// Create the new autosave as a special post revision.
		$revision_id = _wp_put_post_revision( $post_data, true );
	}

	if ( is_wp_error( $revision_id ) || 0 === $revision_id ) {
		return $revision_id;
	}

	// Attached any passed meta values that have revisions enabled.
	if ( ! empty( $meta ) ) {
		foreach ( $revisioned_meta_keys as $meta_key ) {
			if ( isset( $meta[ $meta_key ] ) ) {
				update_metadata( 'post', $revision_id, $meta_key, wp_slash( $meta[ $meta_key ] ) );
			}
		}
	}

	return $revision_id;
}

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