$_SESSION array empty key

Question

<?php session_start();?>

<?php
    !isset($_GET["id"]) ? header("Location: store.php") : $id = $_GET['id'];
?>

<?php
    $_SESSION["items"][$id] = 1; 
    print_r($_SESSION);
?>

This outputs

    Array
    (
        [items] => Array
            (
                [1] => 1
                [] => 1
                [2] => 1
                [3] => 1
            )
    )

There always appears one key empty. Why that key is empty.

Try clearing out the Session in your browser and test it again. — Virendra
– Virendra, Commented Dec 30, 2011 at 17:32
Can you add the output of print_r($_GET) to your question? — user895378
– user895378, Commented Dec 30, 2011 at 17:32

oodavid · Accepted Answer · 2011-12-30 17:33:01Z

4

It's this line here:

$_SESSION["items"][$id] = 1;

if $id is undefined, then the undefined key is set to 1, you need to validate the $id before you assign it, a simple way to do this would be:

if(isset($id)){
    $_SESSION["items"][$id] = 1;
}

Should do the trick :-)

answered Dec 30, 2011 at 17:33

oodavid

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2 Comments

Nick Rolando Over a year ago

But if $_GET["id"] isn't set, it should redirect to a different page, so he shouldn't have that problem.

oodavid Over a year ago

@Shredder - PHP will keep processing the document regardless of headers, it's the client that decides to follow the Location header. So good point! Remember to add an exit(); command after outputting your location header :-)

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