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Subject: Re: [PHP-DEV] Proposal for serious BC compatibility aka language
 versioning
From: rasmus@lerdorf.com (Rasmus Lerdorf)

On 02/03/2013 02:03 PM, Karoly Negyesi wrote:
> Well, fixing a segfault, adding a new function or method as it oft
> happened in PHP 5.3 is only breaking forwards compatibility not
> backwards -- if you have code that ran on PHP 5.3.4 it'll run on
> 5.3.5. The reverse is not true which causes some headaches to Drupal
> developers but it's not relevant to this discussion.
> 
> So, what about adding a version string to the opening <?php tag so
> that you can fix bugs while not breaking BC :P ?

We had that in the past and it was a mess. We are not going to make that
mistake again.

-Rasmus