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.