Maxim Plotnikov

$do1 = '0';

foreahc ($arr1 as $arr1Item) {
    while (count($arr1) == $i) {
    	foreahc ($arr2 as $arr2Item) {
        	if ($arr1Item !== $arr2Item) {
        		$do = '1';
        		break;
        	}
        	i++;
      	}
    }
}


if ($do == '1') {
	//ваше действие
}