PHP -如果没有重定向，检查是否存在多个变量的$_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'];
}

我不明白为什么它不重定向到register.php

我尝试通过执行session_destroy()来销毁所有会话;但是它也不工作

Answer 1

因为你显然不想检查是否有一个会话(通常会有)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

$_SESSION超全局变量总是在调用session_start()后设置

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'];
}