- substr: documentation ( source)
- var_dump: documentation ( source)
<?php
$text = "1234R5T67821345672345678234561234R5T67821345672345678234561234R5T67821345672345678234561234R5T67821345672345678234561234R5T6782134567234567823456nejakytext";
$_md5 = substr($content,-32);
$content = substr($content,0,-32);
var_dump($content);