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Fatal error: Call to undefined function session_is_registered() in

Hi,

I know the cause of this issue. I have PHP 5.4 on a new host and this error is due to that since it was older on another host.

Is there something I can edit in a custom php.ini file to make this go away and still keep using it?

Thanks!

Gary

You can't use it, it's been removed.

Now you have to check if it is set

if(isset($_SESSION['session_name'])){
...

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Brian Tao

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Ray Paseur

Please see the second foreword to this article:
https://www.experts-exchange.com/Programming/Languages/Scripting/PHP/A_2391-PHP-login-logout-and-easy-access-control.html

Executive summary: This was deprecated at PHP 5.3, over 5 years ago. There are other, current PHP functions that do things the right way, so just correct the code. Here's one suggestion:
http://php.net/manual/en/function.session-is-registered.php#111878

Computer Guy

ASKER

This is what the original code is:
if (session_is_registered($k)) continue;

Is this the correct syntax to replace it with?
if (!function_exists('session_is_registered($k'))continue;{
function session_is_registered($k){
return (isset($_SESSION[$k]));

Ray Paseur

Umm, probably this is a correct replacement.

if (isset($_SESSION[$k])) continue;

Open in new window

If you want to explore the deep-background thinking on the session-register concept and why it's not used any more, learn about register-globals. Automatic injection of external variables was supposed to make PHP "easy" but it actually made PHP horribly insecure and hackable, so we don't do that any more.

If you look at your code base and find a lot of instances of session_is_registered() then it might make sense to define the function, but my thinking would be to just correct the code, since the correction using isset() will be forward and backward compatible.

Ray Paseur

To amyone coming upon this Q/A in the future, the explanation of the issue can be found here:
https://www.experts-exchange.com/questions/28530812/Fatal-error-Call-to-undefined-function-session-is-registered-in.html?anchorAnswerId=40360143#a40360143

And the correct answer (at least the one that won't get you fired) is here:
https://www.experts-exchange.com/questions/28530812/Fatal-error-Call-to-undefined-function-session-is-registered-in.html?anchorAnswerId=40360825#a40360825