This document summarizes new features and changes in PHP 5.6, including:
- Constant scalar expressions allow constants to be used in expressions like ONE * 2.
- Variadic functions allow functions to accept variable numbers of arguments via ... and arguments can be unpacked via ....
- Exponentiation is supported via **.
- __debugInfo() allows objects to customize debug output from var_dump().
- Default character encoding changed from ISO-8859-1 to use default_charset.
- Several new functions were added and some functions were changed to be more strict and compatible.