php split

<?php

function clean($data){
$data=preg_replace('/[^0-9]+/', '', $data);
$data = str_split($data);
return $data;
}


$a=clean("812z5124zdd346");

print_r($a[0]);

print_r($a[1]);

print_r($a[2]);


this will only allow numbes and  create  an arrary from the string,   using function mode