(PHP 5 >= 5.3.0, PHP 7) Check whether the doubly linked list contains more nodes

(PHP 5 >= 5.5.0, PHP 7) Reinitialises the array after being unserialised

(PHP 5 >= 5.1.2, PHP 7) Try all registered __autoload() function to load the requested class

(PHP 5 >= 5.3.0, PHP 7) Peeks at the node from the top of the heap

(PHP 5 >= 5.3.0, PHP 7) Adds an element to the queue.

(PHP 5 >= 5.1.0, PHP 7) Set maximum line length

(PHP 5 >= 5.1.2, PHP 7) Alias of

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

(PECL spl_types >= 0.1.0) Returns all consts (possible values) as an array.

(PHP 5 >= 5.1.2, PHP 7) Tells if the file is a directory