- var_dump: documentation ( source)
- filter_var_array: documentation ( source)
<?php
$data = array(
'key1' => 'val1',
'key2' => 'Äèöüß',
'key3' => array ('sub1' => 'Äpfel'),
);
var_dump(filter_var_array($data,FILTER_SANITIZE_FULL_SPECIAL_CHARS));