function usercheck ($username) {
$database = "xxxxx_defter";
$hostname = "localhost";
$username = "xxxxx_root";
$password = 'xxxxxxxx';
$db=mysql_connect($hostname,$username,$password);
mysql_select_db($database,$db) or die("Could not select the database!");;
$check = "SELECT id FROM uye WHERE uyeadi = '".$username."'";
$check_result = mysql_query($query) or die (mysql_error());
return mysql_num_rows($check_result);
}