Cookie is not being set - PHP

**更新-问题已解决**我的代码是正确的，只是我需要指定目录。设置cookie的文件位于子域中，因此跳过根目录。我更改了代码，将cookie设置为：

setcookie('Remember','remembercheck',time()+3600,'/','.mydomain.com');

现在设置正确。

**结束更新**

当我尝试在不选中"记住我"按钮的情况下登录时，cookie没有设置，我也没有登录。如果我在选中"记住"按钮的状态下登录，它会正常登录。有什么想法吗？我被难住了！

PHP:

<?php
require 'connect.php';
require 'functions.php';
session_name('login');
session_start();
// ---------- LOGIN ---------- 
if($_POST['submit']=='Login')
{   
    // Checking whether the Login form has been submitted
    $err = array();
    // Will hold our errors

    if(!$_POST['username'] || !$_POST['password'])
        $err[] = 'All the fields must be filled in!';
    if(!count($err))
    {
        $_POST['username'] = mysql_real_escape_string($_POST['username']);
        $_POST['password'] = mysql_real_escape_string($_POST['password']);
        $_POST['remembercheck'] = (int)$_POST['remembercheck'];
        $storedsaltquery = mysql_fetch_assoc(mysql_query("SELECT rand FROM membertable WHERE usr = '".$_POST['username']."'"));
        $storedsalt = $storedsaltquery['rand'];
        // Escaping all input data
        $row = mysql_fetch_assoc(mysql_query("SELECT id,usr, FROM membertable WHERE usr='{$_POST['username']}' AND pass='{$_POST['password']}'"));
        if($row['id'])
        {
            // If everything is OK login
            $_SESSION['usr']=$row['usr'];
            $_SESSION['id'] = $row['id'];
            $_SESSION['remembercheck'] = $_POST['remembercheck'];
            // Store some data in the session
            setcookie("Remember","remembercheck");
        }
        else $err[]='Wrong username and/or password!';
    }
    if($err)
    $_SESSION['msg']['login-err'] = implode('<br />',$err);
    // Save the error messages in the session
    echo header("Location: ../index.php");
    exit;
}

HTML:

<?php
require 'includes/connect.php';
require 'includes/functions.php';
session_name('crmLogin');
// Starting the session
session_start();
if($_SESSION['id'] && !isset($_COOKIE['Remember']) && !$_SESSION['remembercheck'])
{
    // If you are logged in, but you don't have the Remember cookie (browser restart)
    // and you have not checked the remembercheck checkbox:
    $_SESSION = array();
    session_destroy();
    // Destroy the session
}

if(isset($_GET['logoff']))
{
    $_SESSION = array();
    session_destroy();
    header("Location: index.php");
    exit;
}
?>
    <form name="login" action="includes/logincheck.php" method="post">
                Username: <input type="text" name="username" id="username" /><br>
                Password: <input type="password" name="password" id="password" /><br>
                <input name="remembercheck" id="remembercheck" type="checkbox" checked="checked" value="1" />&nbsp;&nbsp;Remember Me&nbsp;&nbsp;
                <input type="submit" value="Login" name="submit"/><br><br><br>
   </form>