Legacy Frameworks
Until now, we have been discussing legacy applications as page-based, include-oriented systems. However, there is also a large base of legacy code out there using public frameworks.
Framework-based Legacy Applications
Each different public framework in PHP land is its own unique hell. Applications written in CakePHP (http://cakephp.org/) suffer from different legacy issues than those written in CodeIgniter, Solar, Symfony 1, Zend Framework 1, and so on. Each of these different frameworks, and their varying work-alikes, encourage different kinds of tight-coupling in applications. Thus, the specific steps needed to refactor applications built using one of these frameworks are very different from the steps needed for a different framework. ...
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