(PHP 5 >= 5.5.0, PHP 7) Get the boolean value of a variable
(PHP 4, PHP 5, PHP 7) Creates a PHP value from a stored representation
(PHP 4, PHP 5, PHP 7) Finds whether a variable is a number or a numeric string
(PHP 4 >= 4.0.4, PHP 5, PHP 7) Finds whether a variable is NULL
(PHP 4 >= 4.0.5, PHP 5, PHP 7) Finds whether a variable is a scalar
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Dumps a string representation of an internal zend value to output
(PHP 4, PHP 5, PHP 7) Finds whether a variable is an object
(PHP 4, PHP 5, PHP 7) Generates a storable representation of a value
(PHP 4 >= 4.2.0, PHP 5, PHP 7) Outputs or returns a parsable string representation of a variable
(PHP 4 >= 4.0.2, PHP 5, PHP 7) Returns the resource type
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