- var_dump: documentation ( source)
- rtrim: documentation ( source)
- explode: documentation ( source)
- array_pop: documentation ( source)
<?php
$str = '0000-0024-0055-';
$str = rtrim($str,'-');
$codes = explode('-',$str);
var_dump($codes);
$maxCode = (int)array_pop($codes);
var_dump($maxCode);