- var_dump: documentation ( source)
- array_intersect_key: documentation ( source)
- array_flip: documentation ( source)
<?php
// Get the values "a", "b" from
$arr = array('a' => 'foo', 'b' => 'bar', c => 'car');
var_dump(array_intersect_key($arr, array_flip(array('a', 'b'))));
// returns array('array('a' => 'foo', 'b' => 'bar')