Special Characters replace in PHP

special_character_replace.php

function Replace_Set()
{
    $replace = array(
        'À' => 'A', 'Á' => 'A', 'Â' => 'A', 'Ã' => 'A', 'Ä' => 'Ae', 
        'Ä' => 'A', 'Å' => 'A', 'Ā' => 'A', 'Ą' => 'A', 'Ă' => 'A', 
        'Æ' => 'Ae', 'Ç' => 'C', 'Ć' => 'C', 'Č' => 'C', 'Ĉ' => 'C', 
        'Ċ' => 'C', 'Ď' => 'D', 'Đ' => 'D', 'Ð' => 'D', 'È' => 'E', 
        'É' => 'E', 'Ê' => 'E', 'Ë' => 'E', 'Ē' => 'E', 'Ę' => 'E', 
        'Ě' => 'E', 'Ĕ' => 'E', 'Ė' => 'E', 'Ĝ' => 'G', 'Ğ' => 'G', 
        'Ġ' => 'G', 'Ģ' => 'G', 'Ĥ' => 'H', 'Ħ' => 'H', 'Ì' => 'I', 
        'Í' => 'I', 'Î' => 'I', 'Ï' => 'I', 'Ī' => 'I', 'Ĩ' => 'I', 
        'Ĭ' => 'I', 'Į' => 'I', 'İ' => 'I', 'IJ' => 'IJ', 'Ĵ' => 'J', 
        'Ķ' => 'K', 'Ł' => 'K', 'Ľ' => 'K', 'Ĺ' => 'K', 'Ļ' => 'K', 
        'Ŀ' => 'K', 'Ñ' => 'N', 'Ń' => 'N', 'Ň' => 'N', 'Ņ' => 'N', 
        'Ŋ' => 'N', 'Ò' => 'O', 'Ó' => 'O', 'Ô' => 'O', 'Õ' => 'O',
        'Ö' => 'Oe', 'Ö' => 'Oe', 'Ø' => 'O', 'Ō' => 'O', 'Ő' => 'O', 
        'Ŏ' => 'O', 'Œ' => 'OE', 'Ŕ' => 'R', 'Ř' => 'R', 'Ŗ' => 'R', 
        'Ś' => 'S', 'Š' => 'S', 'Ş' => 'S', 'Ŝ' => 'S', 'Ș' => 'S', 
        'Ť' => 'T', 'Ţ' => 'T', 'Ŧ' => 'T', 'Ț' => 'T', 'Ù' => 'U', 
        'Ú' => 'U', 'Û' => 'U', 'Ü' => 'Ue', 'Ū' => 'U', 'Ü' => 'Ue', 
        'Ů' => 'U', 'Ű' => 'U', 'Ŭ' => 'U', 'Ũ' => 'U', 'Ų' => 'U', 
        'Ŵ' => 'W', 'Ý' => 'Y', 'Ŷ' => 'Y', 'Ÿ' => 'Y', 'Ź' => 'Z', 
        'Ž' => 'Z', 'Ż' => 'Z', 'Þ' => 'T', 'à' => 'a', 'á' => 'a', 
        'â' => 'a', 'ã' => 'a', 'ä' => 'ae', 'ä' => 'ae', 'å' => 'a', 
        'ā' => 'a', 'ą' => 'a', 'ă' => 'a', 'æ' => 'ae', 'ç' => 'c', 
        'ć' => 'c', 'č' => 'c', 'ĉ' => 'c', 'ċ' => 'c', 'ď' => 'd', 
        'đ' => 'd', 'ð' => 'd', 'è' => 'e', 'é' => 'e', 'ê' => 'e',
        'ë' => 'e', 'ē' => 'e', 'ę' => 'e', 'ě' => 'e', 'ĕ' => 'e', 
        'ė' => 'e', 'ƒ' => 'f', 'ĝ' => 'g', 'ğ' => 'g', 'ġ' => 'g', 
        'ģ' => 'g', 'ĥ' => 'h', 'ħ' => 'h', 'ì' => 'i', 'í' => 'i', 
        'î' => 'i', 'ï' => 'i', 'ī' => 'i', 'ĩ' => 'i', 'ĭ' => 'i', 
        'į' => 'i', 'ı' => 'i', 'ij' => 'ij', 'ĵ' => 'j', 'ķ' => 'k', 
        'ĸ' => 'k', 'ł' => 'l', 'ľ' => 'l', 'ĺ' => 'l', 'ļ' => 'l', 
        'ŀ' => 'l', 'ñ' => 'n', 'ń' => 'n', 'ň' => 'n', 'ņ' => 'n', 
        'ʼn' => 'n', 'ŋ' => 'n', 'ò' => 'o', 'ó' => 'o', 'ô' => 'o', 
        'õ' => 'o', 'ö' => 'oe', 'ö' => 'oe', 'ø' => 'o', 'ō' => 'o', 
        'ő' => 'o', 'ŏ' => 'o', 'œ' => 'oe', 'ŕ' => 'r', 'ř' => 'r', 
        'ŗ' => 'r', 'š' => 's', 'ù' => 'u', 'ú' => 'u', 'û' => 'u', 
        'ü' => 'ue', 'ū' => 'u', 'ü' => 'ue', 'ů' => 'u', 'ű' => 'u',
        'ŭ' => 'u', 'ũ' => 'u', 'ų' => 'u', 'ŵ' => 'w', 'ý' => 'y', 
        'ÿ' => 'y', 'ŷ' => 'y', 'ž' => 'z', 'ż' => 'z', 'ź' => 'z', 
        'þ' => 't', 'ß' => 'ss', 'ſ' => 'ss', 'ый' => 'iy', 'А' => 'A', 
        'Б' => 'B', 'В' => 'V', 'Г' => 'G', 'Д' => 'D', 'Е' => 'E', 
        'Ё' => 'YO', 'Ж' => 'ZH', 'З' => 'Z', 'И' => 'I', 'Й' => 'Y', 
        'К' => 'K', 'Л' => 'L', 'М' => 'M', 'Н' => 'N', 'О' => 'O', 
        'П' => 'P', 'Р' => 'R', 'С' => 'S', 'Т' => 'T', 'У' => 'U', 
        'Ф' => 'F', 'Х' => 'H', 'Ц' => 'C', 'Ч' => 'CH', 'Ш' => 'SH', 
        'Щ' => 'SCH', 'Ъ' => '', 'Ы' => 'Y', 'Ь' => '', 'Э' => 'E', 
        'Ю' => 'YU', 'Я' => 'YA', 'а' => 'a', 'б' => 'b', 'в' => 'v', 
        'г' => 'g', 'д' => 'd', 'е' => 'e', 'ё' => 'yo', 'ж' => 'zh', 
        'з' => 'z', 'и' => 'i', 'й' => 'y', 'к' => 'k', 'л' => 'l',
        'м' => 'm', 'н' => 'n', 'о' => 'o', 'п' => 'p', 'р' => 'r', 
        'с' => 's', 'т' => 't', 'у' => 'u', 'ф' => 'f', 'х' => 'h', 
        'ц' => 'c', 'ч' => 'ch'
    );
    return $replace;
}

$char_replace_list = Replace_Set();

echo str_replace(array_keys($char_replace_list), $char_replace_list, $slug));