(PHP 5 >= 5.0.0, PHP 7) Unsets the value at the specified index

(PHP 5 >= 5.0.0, PHP 7) Get the number of public properties in the ArrayObject

(PHP 5 >= 5.0.0, PHP 7) Creates a copy of the ArrayObject.

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

(PHP 5 >= 5.0.0, PHP 7) Create a new iterator from an ArrayObject instance

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

(PHP 5 >= 5.2.0, PHP 7) Sort the entries by keys using a user-defined comparison function

(PHP 5 >= 5.1.0, PHP 7) Sets the iterator classname for the ArrayObject.

(PHP 5 >= 5.0.0, PHP 7) Construct a new array object

(PHP 5 >= 5.3.0, PHP 7) Unserialize an ArrayObject