array_intersect.php

<?php

$arr1 = array('a' => 'foo', 'b' => 'bar', 'c' => array('spam', 'ham'), 'd' => array('baz'));
$arr2 = array('a' => 'foo', 'c' => array('ham'), 'd' => array('baz'));

$result = array_uintersect_assoc($arr1, $arr2, function ($a1, $a2) {
    if ($a1 === $a2) {
        return 0;
    }
    return -1;
});

var_dump($result);

/*
array(2) {
  'a' =>
  string(3) "foo"
  'd' =>
  array(1) {
    [0] =>
    string(3) "baz"
  }
}
*/