Find Array Intersection

gistfile1.txt

function findIntersection($array1, $array2) {
  $intersect = [];
  foreach($array2 as $value) {
    if (array_key_exists($value, $array1) && $array1[$value] == $value) {
      $intersect[] = $value;
    }
  }

  return $intersect;
}

$array1 = ['1' => 1, '3' => 3, '2' => 2];
$array2 = [2,4,3];

print_r(findIntersection($array1, $array2));