(PHP 5 >= 5.3.0, PHP 7) Check whether the array contains more elements

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

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

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

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

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