(PHP 5 >= 5.2.2, PHP 7) The number of elements in the iterator

(PHP 5 >= 5.3.0, PHP 7) End children public

(PHP 5 >= 5.4.0, PHP 7) Returns current regular expression

(PHP 5 >= 5.1.0, PHP 7) Receive update from subject

(PHP 5 >= 5.3.0, PHP 7) Get the prefix public

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

(PHP 5 >= 5.2.0, PHP 7) Sort the entries by value

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

(PHP 5 >= 5.3.0, PHP 7) Return current array entry

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