Zeev Suraski wrote:

Finally, at the risk of sounding like a broken record, we always need to remember that BC breakage accumulates, and it's not binary. Every cleanup we do in PHP 6 will further slow migration, and as Andi pointed out a few days ago, things don't look too well as it is.

Agreed, its not binary, but its also not the simple addition of all issues either. The effort does diminish as you can cover multiple BC breaks in one going over your code. The key thing that we screwed up with PHP 5.x was not providing enough documentation on the BC breaks. Doing this better this time (the migration guides are a good start, porting some major apps and documenting the issues is another) could help us easy the transition as well. But as you point out, there is the fixed overhead of having to do the QA'ing at any rate.

regards,
Lukas

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