It is not another implementation of core same-named functions. Packet internally uses php core same-named functions (all magic from Decorators), so you can be sure, that callbackable function will ...

This component provide a PHP static class for array utils functions and expose these as regular PHP functions.

PHP provides two functions, extract ( ) and compact ( ), that convert between arrays and variables. Both compact () and extract () are Array functions of PHP compact (): The compact () function is ...