$str = str_replace("ç","& ccedil;",$str);
$str = str_replace("ğ","& #287;",$str);
$str = str_replace("ı","& #305;",$str);
$str = str_replace("ö","& ouml;",$str);
$str = str_replace("ü","& uuml;",$str);
$str = str_replace("ş","& #351;",$str);

$str = str_replace("Ç","& Ccedil;",$str);
$str = str_replace("Ğ","& #286;",$str);
$str = str_replace("İ","& #304;",$str);
$str = str_replace("Ö","& Ouml;",$str);
$str = str_replace("Ü","& Uuml;",$str);
$str = str_replace("Ş","& #350;",$str);