- var_dump: documentation ( source)
- preg_replace: documentation ( source)
<?php
$test = 'test /*sdiznkngu ehfsdfhisdu fjaoaj* jrdgjnfsdgjuhd fihj/ fgölkmfdnn*/ idufhijksdm gkj*/ solala
//gfkjlgn fdkughnsmdg fdhgsfd
joar
';
$c = preg_replace('!\/\*(.*?)\*\/!si','',$c);
var_dump($c);