(PHP 5 >= 5.3.0, PHP 7) Get the handling flags

(PHP 5 >= 5.3.0, PHP 7) Get the number of directories and files

(PHP 5 >= 5.0.0, PHP 7) Unset value for an offset

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

(PHP 5 >= 5.1.0, PHP 7) Seek to specified line

(PHP 5 >= 5.3.0, PHP 7) Returns the value at the specified $index

(PHP 5 >= 5.3.0, PHP 7) Returns whether the requested index exists

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

(PHP 5 >= 5.3.0, PHP 7) Extracts a node from top of the heap and sift up.

(PHP 5 >= 5.2.0, PHP 7) Returns an iterator for the current entry.