Заменяет сиволы в строке с русского на английский

function translit.php

function translit($str){
    $alphavit = array(
    /*--*/
    "а"=>"a","б"=>"b","в"=>"v","г"=>"g","д"=>"d","е"=>"e",
    "ё"=>"yo","ж"=>"j","з"=>"z","и"=>"i","й"=>"i","к"=>"k","л"=>"l", "м"=>"m",
    "н"=>"n","о"=>"o","п"=>"p","р"=>"r","с"=>"s","т"=>"t",
    "у"=>"y","ф"=>"f","х"=>"h","ц"=>"c","ч"=>"ch", "ш"=>"sh","щ"=>"sh",
    "ы"=>"i","э"=>"e","ю"=>"u","я"=>"ya",
    /*--*/
    "А"=>"A","Б"=>"B","В"=>"V","Г"=>"G","Д"=>"D","Е"=>"E", "Ё"=>"Yo",
    "Ж"=>"J","З"=>"Z","И"=>"I","Й"=>"I","К"=>"K", "Л"=>"L","М"=>"M",
    "Н"=>"N","О"=>"O","П"=>"P", "Р"=>"R","С"=>"S","Т"=>"T","У"=>"Y",
    "Ф"=>"F", "Х"=>"H","Ц"=>"C","Ч"=>"Ch","Ш"=>"Sh","Щ"=>"Sh",
    "Ы"=>"I","Э"=>"E","Ю"=>"U","Я"=>"Ya",
    "ь"=>"","Ь"=>"","ъ"=>"","Ъ"=>"", " "=>"_"
    );
    return strtr($str, $alphavit);
}