(PHP 4, PHP 5, PHP 7) Sort an array by values using a user-defined comparison function

(PHP 7) Gets the function name of the generator

(PHP 7) Checks if the function has a specified return type

(PHP 4, PHP 5, PHP 7) Determine whether a variable is empty

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Returns an array of all defined variables

(PHP 5, PHP 7) Construct a ReflectionProperty object

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

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

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

(PHP 5, PHP 7) Checks if method is a constructor