(PHP 5, PHP 7) Checks if is internal public bool
(PHP 5 >= 5.0.3, PHP 7) Gets number of required parameters
(PHP 5, PHP 7) Gets file name public string
(PHP 5, PHP 7) To string abstract public void
(PHP 5, PHP 7) Clones function final private
(PHP 5 >= 5.5.0, PHP 7) Returns whether this function is a generator
(PHP 5 >= 5.3.0, PHP 7) Checks if function in namespace
(PHP 5, PHP 7) Checks if deprecated public bool
(PHP 5 >= 5.0.3, PHP 7) Gets number of parameters
(PHP 5 >= 5.3.0, PHP 7) Checks if closure
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