I have a custom module that subscribes to an event called catalog_product_collection_apply_limitations_after. In the observer I am setting a variable (E.g $_GET['test'] = true)

Then later in my .phtml file I am accessing that to do logic based on the variable. It works well, however, once launched on one of our client's webshop, all the globals like $_GET, $_POST, $_REQUEST appears empty.

My guess is that there is a redirect happening, but then I ask myself why in the world would someone do that, as it definitely messes up most 3rd party extensions. But I might be wrong though.

Any other ideas of why would this be happening ?

P.S Here's a subset of var dump of $GLOBALS variable in the frontend:

array(16) { ["_GET"]=> array(1) { ["limit"]=> string(2) "12" } ["_POST"]=> array(0) { }

2 Answers 2


I think the using of the $_SESSION global variable is solution for you, because after the redirect your server drops all of the $_REQUEST variables.

Here is answer for similar problem:

Global variables are not persistent between http requests, like a redirect. You have to use a session to store this data between requests.

  • I really hate the sessions as I will have to clear my variables after they are read, but I guess there's no other option. P.S Do you have any idea why would someone be doing these redirects? Is there a purpose? Security issue or whatever?
    – Emke
    Aug 8, 2016 at 13:06
  • @Emke You should deeply research this problem. In my opinion it's bug or just a bad code. Aug 8, 2016 at 13:12
  • @Emke Well written redirect should save all request data, because you can transfer through it the product id or other important information. Aug 8, 2016 at 13:16
  • ok, thanks for the info. I will forward the issue towards the shop's developers. Meanwhile, I will hard code the module to use sessions for them. Thanks
    – Emke
    Aug 8, 2016 at 13:25

I'd advise using the Magento registry rather than setting values using the GET variable.

// Set the registry value
Mage::register('test', TRUE);

// Gets the registry value
$registryValue = Mage::registry('test');

Of course, if it is redirecting your request then this also won't work :)

  • exactly, as there's a redirect happening, I can't use that either. And I need the variable to be request scope (and read it on the frontend). I don't feel like using sessions and deleting the variables once I read them, sounds like too much overhead
    – Emke
    Aug 8, 2016 at 12:47
  • Right solution. Direct use of a of global variables is not a good practice. Aug 8, 2016 at 12:47
  • @Emke can you get your access logs from the server and copy the contents from when you access the pages?
    – Paul
    Aug 8, 2016 at 12:48
  • It's not a solution, as it doesn't yet solve my problem :)
    – Emke
    Aug 8, 2016 at 12:48
  • @Paul here's a filtered subset of access logs pastebin.com/SLeKcdnV
    – Emke
    Aug 8, 2016 at 12:57

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