- var_dump: documentation ( source)
- array_intersect_ukey: documentation ( source)
<?php
$a = [1 => 'a', 2=> 'b', 3 => 'c'];
$b = [1, 3];
var_dump(array_intersect_ukey($a, $b, function ($item, $c) {
var_dump($item);
var_dump($c);
var_dump('-');
return $item === $c;
}));