(PHP 5 >= 5.1.0, PHP 7) Checks if the storage contains a specific object

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

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

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

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

(PHP 5 >= 5.1.0, PHP 7) Check whether the inner iterator's current element has children

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

(PHP 5 >= 5.4.0, PHP 7) Create a RecursiveCallbackFilterIterator from a RecursiveIterator

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

(PHP 5 >= 5.2.0, PHP 7) Sets the flags. public