(PHP 5 >= 5.1.0, PHP 7) Gets character from file

(PHP 5 >= 5.3.0, PHP 7) Constructs a new filesystem iterator

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

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

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

(PHP 5 >= 5.3.0, PHP 7) Shifts a node from the beginning of the doubly linked list

(PHP 5 >= 5.1.0, PHP 7) Check whether the current element is valid

(PHP 5 >= 5.2.0, PHP 7) Sets the operation mode.

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

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