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Call to undefined method error - Please help

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I have been given the task of migrating a current live osCommerce website, version 2.3.4 from a server running PHP 5.3.3 to a server running PHP 7.0.33. I understand that I should really upgrade to the latest (Frozen) version of osCommerce but this live site has many custom coded features and addons that will need to be re-written to be added to the latest version and I only have a short time before the old server is switched off.  I have a test environment set up on the new server and I've moved copies of the existing database and files to create the error testing site. I have managed to correct many issues by renaming the class function name to '__construct'. My admin side seems to be working fine, however on the store front I'm getting this error whenever a product is added to the cart or any message is to be displayed : 

Fatal error: Uncaught Error: Call to undefined method messageStack::alertBlock() in /home/xxxxx/public_html/xxxxx/includes/classes/message_stack.php:66 Stack trace: #0 /home/xxxx/public_html/xxxx/includes/modules/product_listing.php(4): messageStack->output('product_action') #1 /home/xxxx/public_html/xxxxx/index.php(227): include('/home/xxxx...') #2 {main} thrown in /home/xxxx/public_html/xxxx/includes/classes/message_stack.php on line 66

The line in question is:

return $this->alertBlock($output);

Does anyone have any ideas how I can fix this? I would appreciate any suggestions on how to sort this out.

Many thanks.


Ah, the world wide web. What a wonderful place.

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messageStack extends alertblock, make sure that's at the top of your class i.e. class messageStack extends alertBlock {

Then make sure includes/classes/alertbox.php is being included in application_top.php i.e.

 $messageStack = new messageStack;

If it still don't work, hit it again!

Senior PHP Dev with 18+ years of experience for hire, all requirements considered, see profile for more information.

Is your version of osC up to date? You'll find the latest osC version (the community-supported responsive version) here.

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I have managed to correct many issues by renaming the class function name to '__construct'.

Blindly renaming class function names to __construct may cause problems. See the discussion in

In some cases you may need to leave class function name and build either a dummy __construct or one that calls class function name. You could get a copy of Frozen and look at the class code to see what was done there.

If this is just a temporary bridge until you can get onto Frozen (or even Edge), you might want to consider simply suppressing "deprecated" warnings. There's plenty of discussion on this forum. It's not a permanent fix, as eventually something will be removed from PHP and cause serious errors, but it could tide you over until you have an up-to-date osC running (2.3.4 is quite long of tooth).

If you are running the "official" osC 2.3.4 or download, your installation is obsolete! Get (stable) Frozenpatches or (unstable) Edge. See also the naming convention and the latest community-supported responsive "Edge" release

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