The most recent version of PHP, PHP 8.2, was released in November 2022. It has a number of new features and enhancements, including a JIT compiler, union types, attributes, named arguments, and enhanced error handling. The previous version, PHP 7.4, published in November 2019, does not have these features. However, testing may be necessary before upgrading to PHP 8, as some older code might not be compatible with PHP 8.