wp_set_post_lock() WordPress Function

function wp_set_post_lock( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$user_id = get_current_user_id();
	if ( 0 == $user_id ) {
		return false;
	}

	$now  = time();
	$lock = "$now:$user_id";

	update_post_meta( $post->ID, '_edit_lock', $lock );

	return array( $now, $user_id );
}
Uses	Description
wp-includes/user.php:get_current_user_id()	Gets the current user’s ID.
wp-includes/post.php:update_post_meta()	Updates a post meta field based on the given post ID.
wp-includes/post.php:get_post()	Retrieves post data given a post ID or post object.
Used By	Description
wp-admin/includes/misc.php:wp_refresh_post_lock()	Checks lock status on the New/Edit Post screen and refresh the lock.
wp-admin/includes/post.php:wp_write_post()	Creates a new post from the “Write Post” form using `$_POST` information.
wp-admin/includes/post.php:edit_post()	Updates an existing post with values provided in `$_POST`.