/* Array sorting: any number of the elements */


$arr1 = [4 , 3, 4, 5, 3, 8];
$arr2 = [6 , 4, 2, 5, 6, 6, 8, 9, 10];


function SortAny($arr){

$size = count($arr)-1;

$temp;

for ($i = 1; $i <= $size; $i++) {
    $temp=$arr[$i];
    for ($j = $i -1; $j >= 0 && $arr[$j] > $temp; $j--){
            $arr[$j+1]  = $arr[$j];
        }
        $arr[$j+1] = $temp;
}
    return $arr;
}

/* Arrays: finding common elements */

function FindCommonElements($arr1, $arr2) {

$arr1 =SortAny($arr1);
$arr2 = SortAny($arr2);

$arr1size = count($arr1)-1;
$arr2size = count($arr2)-1;

for ($i=0; $i<=$arr1size; $i++){
    for ($j=0; $j <= $arr2size && $arr1[$i] !== $arr1[$i+1]; $j++){
        if ($arr1[$i]!==$arr2[$j] && $arr2[$j] !== $arr2[$j+1]){
            var_dump($arr2[$i]);
        }
    }
}
}
 echo FindCommonElements($arr1, $arr2);