strtolower function in php with windows-1254 charset

Question

i have page and it has,

<meta http-equiv="Content-Type" content="text/html; charset=windows-1254">

when i try to change string with strtolower(). it is not working on "Ç,Ö,Ãœ,Ä,Å".

example,
$str= "ÇaTPÖ";
$str = strtolower($str);
//$str = "ÇatpÖ";

also i try to change them with ereg_replace(), but not working again.
$str = ereg_replace("Ç","ç",$str);
$str = ereg_replace("Ö","ö",$str);

so what's the problem do you think?

Answer 1

Try mb_strtolower():

$str = mb_strtolower($str, 'windows-1254');

http://www.php.net/manual/en/function.mb-strtolower.php