Transliteration

transliterator_transliterate(
	"Any-Latin;
	Latin-ASCII;
	[\u0100-\u7fff] remove;
	Lower()",
	$text);	

1. transliterator_transliterate^[link1] -- Intl Transliterator class
2. ICU Transliteration^[link2] -- International Components for Unicode

Implementation

static function translit($string)
{
	return transliterator_transliterate(
		"Any-Latin;
		Latin-ASCII;
		[\u0100-\u7fff] remove;
		Lower()",
		$string);
}