wp_set_post_lock( int|WP_Post $post ): array|false

Source

 * @since 2.5.0
 *
 * @param int|WP_Post $post ID or object of the post being edited.
 * @return array|false {
 *     Array of the lock time and user ID. False if the post does not exist, or there
 *     is no current user.
 *
 *     @type int $0 The current time as a Unix timestamp.
 *     @type int $1 The ID of the current user.
 * }
 */
function wp_set_post_lock( $post ) {
	$post = get_post( $post );

	if ( ! $post ) {
		return false;
	}

	$user_id = get_current_user_id();

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