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Simon Jones' Blog: Understanding the stack index for Zend Framework Controller plugins

Note: This article was originally published at PHPDeveloper on 22 July 2010.
PHPDeveloper

New on his blog today, Simon Jones has posted a handy guide for those using the Zend Framework out there to the stack index for plugins the framework uses.

Zend Framework Controller plugins are a powerful way to inject logic into your controller system at various points, such as before and after an action dispatch. Plugins are run in the order they are added, though it is possible to change the order by defining a custom stack index. ZF internal plugins such as Zend_Controller_Plugin_ErrorHandler, which displays a nice Error 404 page, has a stack index of 999 to ensure it runs at the end of any plugin cycle. However, it's not so obvious from the ZF manual how to set a custom stack index.

He shows how to use the second parameter of registering a plugin to define the stack level and how to get the listing of the current stack to see just where yours might need to be placed. He also includes code samples and an output example of the default Zend Framework stack.