(PHP 4 >= 4.0.1, PHP 5, PHP 7) Create an anonymous (lambda-style) function

(PHP 5, PHP 7) Get the type hinted class public

(PHP 5, PHP 7) Export a reflection method. public

(PHP 5 >= 5.3.0, PHP 7) Gets namespace name

(PHP 4, PHP 5, PHP 7) Get the integer value of a variable