<?PHP

include '../includes/connection.PHP';
date_default_timezone_set('GMT');

$name = $_POST['username'];
$pass = $_POST['password'];


$query = MysqL_query("SELECT id,username,password FROM users WHERE username = '$name' LIMIT 1");

if(MysqL_num_rows($query) == 0) {
 echo 'error';
 exit;
}

while($row = MysqL_fetch_array($query)) {

 if($row['username'] == $name && $row['password'] == $pass) {

  session_start();
  $_SESSION['username'] = $row['username'];
  $_SESSION['usrID'] = $row['id'];
  echo 'success';


  if($_POST['remember']) {
   setcookie('username',$row['username'],$exp);
   setcookie('password',$row['password'],$exp);
   setcookie('usrID',$row['id'],$exp);
  }

 } else {
  echo 'error';
  exit;
 }



}


?>

会话已成功设置,但是该cookie并未设置.我已经尝试设置所有的值(域,路径等),但没有改变任何东西.有没有什么明显的我失踪？