(PHP 5, PHP 7) Move forward to the next element

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

(PHP 5 >= 5.1.2, PHP 7) Register and return default file extensions for spl_autoload

(PHP 5 >= 5.1.0, PHP 7) Sets flags for the SplFileObject

(PHP 5 >= 5.3.0, PHP 7) Recover from the corrupted state and allow further actions on the heap.

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

(PECL spl_types >= 0.1.0) Creates a new value of some type

(PHP 5 >= 5.3.0, PHP 7) Unsets the value at the specified $index

(PHP 5 >= 5.0.0, PHP 7) Returns whether the requested index exists

(PHP 5 >= 5.3.0, PHP 7) Rewind iterator back to the start (no-op)