PHP: trying to substract the returning values from strpos()

[Tulaan]

i have this code:\[code\]<?php var_dump(strpos($url, "cashgold.")+9) ?><?php var_dump(strpos($url, '/', 8)) ?><?php $resta = strpos($url, '/', 8) - strpos($url, "cashgold.")+9 ?><?php var_dump($resta) ?>\[/code\]this prints:20 2220I expected it prints :20222