Question 284543 in PHP Question posted in
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Problem using PHP null coalescing together with ternary operator to reset a Session

I am trying to reset the Session with the below code:

<?= 
$_SESSION['pettySuccess']??''; 
(($_SESSION['pettySuccess']??'')=='') ?'': unset($_SESSION['pettySuccess']); 
?>

the idea behind my code is for the pettySuccess session to reset the session when it doesn’t evaluate as ‘ ‘
but here I am getting a syntax error. The weird thing is when I changed the unset() method
to session_unset(), I dont have a syntax error anymore, the error I got now was that ‘the session_unset() does not accept any attributes’ and my intention was never to reset all my session variables.

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2

Answers


  1. 0

    unset() is a statement and not a function, so it cannot be used directly within a ternary operator. You can use the following code:

    if (isset($_SESSION['pettySuccess']) && $_SESSION['pettySuccess'] !== '') {
    unset($_SESSION['pettySuccess']);
}
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  2. 0

    I don’t know what your business logic is, but I suspect all you need is:

    unset($_SESSION['pettySuccess']);

    unset() is a language construct so it’s able to detect and ignore missing variables (something that regular functions cannot do), and it actually does (yes, it’s unfortunately not documented).

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