(PHP 5 >= 5.1.0, PHP 7) Get the current key

(PHP 5 >= 5.4.0, PHP 7) Calls the callback with the current value, the current key and the inner iterator

(PHP 5 >= 5.1.0, PHP 7) Get the current key

(PHP 5 >= 5.3.0, PHP 7) Checks if an iterator is attached

(PHP 5 >= 5.3.0, PHP 7) Move to next element

(PHP 5 >= 5.1.0, PHP 7) Rewind the iterator to the specified starting offset

(PHP 5 >= 5.1.0, PHP 7) Get inner iterator

(PHP 5 >= 5.1.0, PHP 7) Get sub path public

(PHP 5, PHP 7) Check whether the current element is valid

(PHP 5 >= 5.3.0, PHP 7) Rewind iterator public