Url translitterointi ä->a vs ä->ae (Ratkaistu)

public static function transliterate($string)
    {
         $str = JString::strtolower($string);
 
         //Specific language transliteration.
         //This one is for latin 1, latin supplement , extended A, Cyrillic, Greek
 
         $glyph_array = array(
         'a'            =>   'à,á,â,ã,ä,å,ā,ă,ą,ḁ,α,ά',
         'ae'   =>   'æ',
         'o'            =>   'ö,ò,ó,ô,õ,ø,ō,ŏ,ő,ο,ό,ω,ώ',
         'oe'   =>   'œ'
         );
 
          foreach( $glyph_array as $letter => $glyphs ) {
          $glyphs = explode( ',', $glyphs );
          $str = str_replace( $glyphs, $letter, $str );
          }
 
          return $str;
        }