function FindUniqueElements($arr1, $arr2) {
$arr1 =SortAny($arr1);
$arr2 = SortAny($arr2);
$arr1withoutArr2 = [];
    for ($i=0; $i<=CountAr($arr1) && $arr1[$i] == $arr1[$i+1]; $i++){
        $found = false;
        for ($j=0; $j <= CountAr($arr2) && $arr2[$j] == $arr2[$j+1];  $j++){
            if ($arr1[$i] === $arr2[$j]){
                $found = true;
                break;
            }
        }
    if (!$found){
        $arr1withoutArr2[] = $arr1[$i];
            }
    }
        print_r($arr1withoutArr2);
}
 echo FindUniqueElements($arr1, $arr2);