- var_dump: documentation ( source)
- array_keys: documentation ( source)
- array_diff: documentation ( source)
<?php
$data = [
'test' => 'test',
0 => '0',
'name' => 'Nik',
10 => '10',
];
$but = [0, 'test'];
var_dump(
array_diff(array_keys($data), $but)
);