как сделать транслит имени загружаемых файлов - Разработки и улучшения

$filters["а"] = "a";
$filters["б"] = "b";
$filters["в"] = "v";
$filters["г"] = "g";
$filters["д"] = "d";
$filters["е"] = "e";
$filters["ж"] = "zh";
$filters["з"] = "z";
$filters["и"] = "i";
$filters["й"] = "y";
$filters["к"] = "k";
$filters["л"] = "l";
$filters["м"] = "m";
$filters["н"] = "n";
$filters["о"] = "o";
$filters["п"] = "p";
$filters["р"] = "r";
$filters["с"] = "c";
$filters["т"] = "t";
$filters["у"] = "u";
$filters["ф"] = "f";
$filters["х"] = "h";
$filters["ц"] = "c";
$filters["ч"] = "ch";
$filters["ш"] = "sh";
$filters["щ"] = "sch";
$filters["ъ"] = "nne";
$filters["ы"] = "yi";
$filters["ь"] = "";
$filters["э"] = "e";
$filters["ю"] = "yu";
$filters["я"] = "ya";
$filters["ё"] = "yo";
$filters["ґ"] = "g";
$filters["і"] = "i";
$filters["ї"] = "yi";
$filters["є"] = "e";
$filters["А"] = "A";
$filters["Б"] = "B";
$filters["В"] = "V";
$filters["Г"] = "G";
$filters["Д"] = "D";
$filters["Е"] = "E";
$filters["Ж"] = "ZH";
$filters["З"] = "Z";
$filters["И"] = "I";
$filters["Й"] = "Y";
$filters["К"] = "K";
$filters["Л"] = "L";
$filters["М"] = "M";
$filters["Н"] = "N";
$filters["О"] = "O";
$filters["П"] = "P";
$filters["Р"] = "R";
$filters["С"] = "C";
$filters["Т"] = "T";
$filters["У"] = "U";
$filters["Ф"] = "F";
$filters["Х"] = "H";
$filters["Ц"] = "C";
$filters["Ч"] = "CH";
$filters["Ш"] = "SH";
$filters["Щ"] = "SCH";
$filters["ъ"] = "NNE";
$filters["Ы"] = "YI";
$filters["Ь"] = "";
$filters["Э"] = "E";
$filters["Ю"] = "YU";
$filters["Я"] = "YA";
$filters["Ё"] = "YO";
$filters["Ґ"] = "G";
$filters["І"] = "I";
$filters["Ї"] = "YI";
$filters["Є"] = "E";

var $file_name_filter = 0;