PHP - Check if $_SESSION exists for multiple variables if not redirect

Question

I have the following PHP code:

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'];
}

I am not unserstanding why it isn't redirecting to register.php

I tried destroying all sessions by doing session_destroy(); but it did not work either

Have you started the session on the first line of your file? — South Coast Web
– South Coast Web, Commented Aug 22, 2014 at 21:11
did you do a var_dump($_SESSION) to see if there's anything in it? isset($_SESSION) would only return false if the session was never started or used previously. — Marc B
– Marc B, Commented Aug 22, 2014 at 21:12
Please provide all code above that snippet. Even something as simple as a blank line outside of php tags could make a difference. — Ian
– Ian, Commented Aug 22, 2014 at 21:12

developerwjk · Accepted Answer · 2014-08-22 21:13:54Z

4

Since you obviously don't really want to just check if there is a session (there pretty much always will be) but if particular session attributes are set, you should be doing it this way:

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

answered Aug 22, 2014 at 21:13

developerwjk

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6 Comments

user2333968 Over a year ago

In my real code I have a whole list of session values (10 or more), I was wondering whether if instead of listing them one by one I'd use !isset($_SESSION)

GolezTrol Over a year ago

If you didn't call session_start() there is no $_SESSION.

developerwjk Over a year ago

@user2333968, You should always post your real code instead of confusing everyone.

user2333968 Over a year ago

session_start() is already included. @developerwjk if I paste all my code I will create more quesstions than get answers.

developerwjk Over a year ago

@GolezTrol, Assuming the code he posted is in use, he must have called session_start() or it would have redirected.

|

SamT · Accepted Answer · 2014-08-22 21:16:21Z

0

The $_SESSION super global will always be set after calling session_start().

Instead, you should check if a particular value is set:

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'];
}

answered Aug 22, 2014 at 21:16

SamT

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