- var_dump: documentation ( source)
- array_combine: documentation ( source)
- str_replace: documentation ( source)
- array_keys: documentation ( source)
<?php
$array = array(
'@afoo' => 'something',
'@abar' => 'something-else'
);
$array = array_combine(str_replace('@a', '', array_keys($array)), $array);
var_dump($array);