(PHP 5 >= 5.2.0, PHP 7) The offsetExists purpose

(PHP 5 >= 5.1.0, PHP 7) Checks if the iterator is valid

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

(PHP 5, PHP 7) Get last modification time of current DirectoryIterator item

(PHP 5 >= 5.2.0, PHP 7) Sort array by values

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

(PHP 5 >= 5.0.0, PHP 7) Rewind array back to the start

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

(PHP 5 >= 5.1.0, PHP 7) The current() method

(PHP 5 >= 5.1.0, PHP 7) Check whether the inner iterator's current element has children