...could be argued that developers should be aware of their language of choice's limitations before attempting to code in it. In the future it is possible that $_REQUEST will go away completely, and PHP developers should begin looking through their code to see what they can start doing now to make their code ready for future PHP versions, with the side benefit of making it more secure. ...

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...to code in a barebones pseudo-MVC manner, with data population at the top of a given php file, display and display logic as necessary afterwards, and any form processing happening in separate ".do" php files (all, of course, interacting with data-oriented library pseudo-classes). Every "display" page includes a configuration header, does what logic/data population it needs to, then includes the "top"...