(PHP 7) Gets the function name of the generator

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

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Applies the callback to the elements of the given arrays

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

(PHP 4, PHP 5, PHP 7) Create an array array array