I don&#x27;t believe its the same. Code from old version of PHP could still be expected to run the same in the newer version except for &quot;deprecation&quot; warnings maybe. Probably, a reason why it is not easy for PHP devs to fix all typecasting quirks their language has.<p>Python 3, on other hand, has tried to fix many design decisions and hence requires some transition effort. The effort is many folds more with so much software already written in Python 2 and large codebases. I am not surprised the adoption is slow.