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

(PHP 5 >= 5.3.0, PHP 7) Sets the mode of iteration

(PHP 5 >= 5.1.2, PHP 7) Returns the path to the file as a string

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

(PHP 5, PHP 7) Move forward to the next element

(PHP 5 >= 5.1.0, PHP 7) Get line number public

(PHP 5 >= 5.1.0, PHP 7) Rewind the file to the first line

(PHP 5 >= 5.1.0, PHP 7) Checks if the storage contains a specific object

(PHP 5 >= 5.3.0, PHP 7) Recover from the corrupted state and allow further actions on the heap.

(PHP 5 >= 5.1.2, PHP 7) Gets file size public