Finding same values on multiple array data PHP

I got this case. I want to return same value that contain from all array data.

$arr1 = [1,2,3,4,5,9,14];
$arr2 = [1,2,10];
$arr3 = [1,2,5];
$arr4 = [1,2,3,5];

The return array value after filtering should :

$finalArr = [1, 2];

Why 1, 2? Because it’s contain in all array data. Then how to filter between array data and to finding final array in PHP? Thanks in advance.

>Solution :

This works!

$arr1 = [1,2,3,4,5,9,14];
$arr2 = [1,2,10];
$arr3 = [1,2,5];
$arr4 = [1,2,3,5];


$duplicates = checkduplicate($arr1, $arr2, $arr3, $arr4);

print_r($duplicates);

function checkduplicate($arr1, $arr2, $arr3, $arr4)
{
    $keys = [];
    foreach($arr1 as $key)
    {
        if(in_array($key, $arr2) && in_array($key, $arr3) && in_array($key, $arr4))
        {
            $keys[] = $key;
        }
    }

    return $keys;
}

This iterates over all the items in the first array, and check if they also contain in the others

You can also use array intersect, which takes multiple arrays

$duplicates = array_intersect($arr1, $arr2, $arr3, $arr4);