(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry.

(PHP 5 >= 5.1.0, PHP 7) Return the parent classes of the given class

(PHP 5 >= 5.3.0, PHP 7) Inserts an element in the heap by sifting it up.

(PHP 5 >= 5.2.0, PHP 7) Sort an array using a case insensitive "natural order" algorithm

(PHP 5 >= 5.3.0, PHP 7) Checks whether the queue is empty.

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

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

(PHP 5 >= 5.0.0, PHP 7) Construct a new array object

(PHP 5 >= 5.1.2, PHP 7) Gets the filename

(PHP 5 >= 5.3.0, PHP 7) Gets the size of the array