There were plans for a never released PHP6. Even some books were published for PHP6, it was meant to be the big unicode release. Most of its feature made it to the 5.4 version. In the end, it seems that it was the better decision to introduce new features in a smoother way. PHP hasn&#x27;t suffered the problems that exists with Python 2 to 3. Although, there was the PHP4 to 5 transition that broke the older object oriented implemention - though most never used OO in PHP4 as it was known to be slow - so it wasn&#x27;t a problem for the community.