(PHP 5 >= 5.4.0, PHP 7) Return the traits used by the given class

(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry if it is a directory

(PHP 5 >= 5.4.0, PHP 7) Calculate a unique identifier for the contained objects

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

(PHP 5 >= 5.4.0, PHP 7) Create a filtered iterator from another iterator

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

(PHP 5 >= 5.1.0, PHP 7) Portable file locking

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

(PHP 5 >= 5.3.0, PHP 7) Sets a new value at a specified index

(PHP 5 >= 5.1.0, PHP 7) Construct public