(PHP 5 >= 5.3.0, PHP 7) Check whether the heap contains more nodes

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

(PHP 5 >= 5.1.2, PHP 7) Sets the class used with

(PHP 5 >= 5.1.2, PHP 7) Sets the class used with

(PHP 5 >= 5.3.0, PHP 7) Counts the number of elements in the doubly linked list.

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

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

(PHP 5 >= 5.1.0, PHP 7) Removes an

(PHP 5 >= 5.1.2, PHP 7) Gets the inode for the file

(PHP 5 >= 5.3.0, PHP 7) Check whether the array contains more elements