- var_dump: documentation ( source)
- array_walk: documentation ( source)
<?php
$array = array('a' => 'Hello', 'b' => 'World');
array_walk($array, 'adda');
function adda(&$value, &$key) {
$key = "a".$key;
$value = 'test ' . $value;
}
var_dump($array);