Slug function and automatic id generator for h2 tags

<?php

function slug($str) {

$search = array('I','İ','ı','ö','Ö','ç','Ç','ğ','Ğ','ü','Ü','Ș','â','Ț', 'ş', 'ţ', 'Ş', 'Ţ', 'ș', 'ț', 'î', 'â', 'ă', 'Î', 'Â', 'Ă', 'ë', 'Ë');

$replace = array('i','i','i','o','o','c','c','g','g','u','u','s','a','t', 's', 't', 's', 't', 's', 't', 'i', 'a', 'a', 'i', 'a', 'a', 'e', 'e');

$str = str_ireplace($search, $replace, strtolower(trim($str)));

$str = preg_replace('/[^\w\d\-\ ]/', '', $str);

$str = str_replace(' ', '-', $str);

return preg_replace('/\-{2,}/', '-', $str);

}

$text = '<h2>Instalation</h2><i>sdfsd</i><h2 class="class" id="7y7- ç" type="54">asdİçd</h2>';

function h2slug($text) {

preg_match_all("|<h2(.*)>(.*)</[^>]+>|U", $text, $out, PREG_SET_ORDER);

foreach ($out as $header) {

$slug = slug($header[2]);

$header[1] = preg_replace('/(?<!\S\W\w\s)(\s?)id(\s?)="(\w*\W*)"/', '' , $header[1]);

$text = str_replace($header[0], '<h2 id="'. $slug .'"'. $header[1] .'>'. $header[2] .'</h2>', $text);

}

return $text;

}

echo h2slug($text);