- var_dump: documentation ( source)
- array_intersect_key: documentation ( source)
- array_flip: documentation ( source)
- array_keys: documentation ( source)
- preg_grep: documentation ( source)
<?php
$values = [
'ffffffff' => 'a',
'ffflohff' => 'b',
'lohlohff' => 'c',
];
$filteredValues = array_intersect_key($values, array_flip(preg_grep('/loh/', array_keys($values))));
var_dump($filteredValues);