- var_dump: documentation ( source)
- explode: documentation ( source)
- preg_replace: documentation ( source)
<?php
$postcode = "HU13 0EG";
$split_postcode = explode(" ",$postcode);
var_dump($split_postcode);
echo "\n\r";
$split_postcode = $split_postcode[0].' '.preg_replace("/[^0-9]*/","",$split_postcode[1]);
var_dump($split_postcode);