- filter_var: documentation ( source)
<?php
$test = "'''''''''commend''''''''''''''''''''''''''\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"\"||||||||/\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\////////////////";
echo filter_var($test,FILTER_SANITIZE_URL,FILTER_FLAG_STRIP_HIGH);