<?php
$str = "Header/Footer";
$special_char_find = array(
"!","#","$","%","&","(",")","*","+",
",","-",".","/",":",";","<","=",">",
"?","@","[","]","^","{","|","}","~"
);
$special_char_replace = array(
"c33","c35","c36","c37","c38","c40","c41","c42","c43",
"c44","c45","c46","c47","c58","c59","c60","c61","c62",
"c63","c64","c91","c93","c94","c123","c124","c125","c126"
);
$str = str_replace($special_char_find, $special_char_replace, $str);
$str = strtolower(preg_replace("/[^A-Za-z0-9_]/", '', str_replace(' ', '_', trim($str))));
$str = trim($str, "_");
echo $str;
preferences:
29.99 ms | 402 KiB | 5 Q