(PHP 5 >= 5.5.0, PHP 7) Get the boolean value of a variable

(PHP 4 >= 4.0.4, PHP 5, PHP 7) Finds whether a variable is NULL

(PHP 5, PHP 7) Checks if iterateable public bool

(PHP 4, PHP 5, PHP 7) Return all the values of an array

(PHP 5, PHP 7) Gets extension ini entries public

(PHP 4, PHP 5, PHP 7) Return the current element in an array

(PHP 4, PHP 5, PHP 7) Prepend one or more elements to the beginning of an array

(PHP 4, PHP 5, PHP 7) Gets the class methods' names

(PHP 4, PHP 5, PHP 7) Get the default properties of the class

(PHP 5, PHP 7) Gets constants public array R