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And thus ensured that either you upgrade your version of PHP and instantly break your application, or that you stick with an older version with potential security flaws, and never bother updating again?

Bonus points if you're not actually in control of the version of PHP your web app runs on.



Being forever backward-compatible is a curse that prevents innovation and makes you end up with the mess of a language that PHP is.


I agree, but you don't have to be backward-compatible forever - you can deprecate features gracefully.




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