(PHP 5 >= 5.3.0, PHP 7) Constructs a new empty queue

(PHP 5 >= 5.1.2, PHP 7) Gets an SplFileInfo object for the path

(PHP 5 >= 5.3.0, PHP 7) Rewind iterator back to the start

(PHP 5 >= 5.1.0, PHP 7) Moves the inner Iterator forward or rewinds it

(PHP 5 >= 5.3.0, PHP 7) Prepends the doubly linked list with an element

(PHP 5 >= 5.3.0, PHP 7) Move to previous entry

(PHP 5 >= 5.3.0, PHP 7) Compare elements in order to place them correctly in the heap while sifting up.

(PHP 5 >= 5.1.0, PHP 7) Flushes the output to the file

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

(PHP 5 >= 5.2.2, PHP 7) Gets the target of a link