(PHP 5 >= 5.1.0, PHP 7) Moves to the next element

(PHP 5 >= 5.1.0, PHP 7) Gets the ArrayIterator

(PHP 5 >= 5.1.0, PHP 7) Gets an index of iterators

(PHP 5 >= 5.1.0, PHP 7) Appends an iterator

(PHP 5 >= 5.1.0, PHP 7) Checks validity of the current element

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

(PHP 5 >= 5.1.0, PHP 7) Gets the inner iterator

(PHP 5 >= 5.1.0, PHP 7) Gets the current value

(PHP 5 >= 5.1.0, PHP 7) Constructs an AppendIterator

(PHP 5 >= 5.1.0, PHP 7) Rewinds the Iterator