[code lang=”php”]function strtoupperTR($str) { $str = str_replace(array(‘i’, ‘ı’, ‘ü’, ‘ğ’, ‘ş’, ‘ö’, ‘ç’), array(‘İ’, ‘I’, ‘Ü’, ‘Ğ’, ‘Ş’, ‘Ö’, ‘Ç’), $str); return strtoupper($str); }[/code] Kaynak: http://forum.ceviz.net/php/41571-strtoupper-hakkinda.html