PHP - 如果没有重定向，检查多个变量是否存在$ _SESSION

Question

我有以下PHP代码：

if(!isset($_SESSION)) {
    session_destroy();
    header('Location: register.php'); //redirect to the orginal form
} else {
    $businessOwnerID = $_SESSION['business_owner_id']; //The Business owner ID
    $mobileValidation = $_SESSION['mobile_validation'];
}

我不知道为什么它没有重定向到register.php

我尝试通过session_destroy（）来销毁所有会话;但它也无效

Answer 1

因为你显然不想确定是否有会话（几乎总会有）但是如果设置了特定的会话属性，你应该这样做：

if(!isset($_SESSION['business_owner_id'], $_SESSION['mobile_validation']))
{
   session_destroy();
   header('Location: register.php'); //redirect to the original form
} 
...

Answer 2

调用$_SESSION后，session_start()超级全局将始终设置。

相反，您应该检查是否设置了特定值：

if(!isset($_SESSION['business_owner_id'])) {
    session_destroy();
    header('Location: register.php'); //redirect to the orginal form
} else {
    $businessOwnerID = $_SESSION['business_owner_id']; //The Business owner ID
    $mobileValidation = $_SESSION['mobile_validation'];
}