- array_intersect_key: documentation ( source)
- print_r: documentation ( source)
- array_flip: documentation ( source)
<?php
$keys = ['a','b','c','d','e','f','g','h','i','z'];
$private = [
'a','b','c','d'
];
$aliases = [
'z' => 'a'
];
print_r(array_intersect_key($private, array_flip($aliases)));