(PHP 5 >= 5.4.0, PHP 7) Duplicates a closure with a specific bound object and class scope
(PHP 7) Binds and calls the closure public mixed
(PHP 5 >= 5.4.0, PHP 7) Duplicates the closure with a new bound object and class scope
(PHP 5 >= 5.3.0, PHP 7) Constructor that disallows instantiation