<?php

error_reporting(-1);

function checkRefrigerator($str) {
	return "anton" == preg_replace('/[^anton]/', "", strtolower($str)) ? true : false;
}

$str = "1247bkla-i3k21mkn213l.rt213;r[oqn";

echo checkRefrigerator($str) ? "BROKEN" : "IT'S OK";