(PHP 5 >= 5.3.0, PHP 7) Retrieve the key for the current file

(PHP 5 >= 5.3.0, PHP 7) Check whether the queue contains more nodes

(PHP 5, PHP 7) Return the string representation of the current element

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

(PHP 5, PHP 7) Return available SPL classes array

(PHP 5 >= 5.3.0, PHP 7) Import a PHP array in a

(PHP 5 >= 5.1.0, PHP 7) Returns an iterator for the current entry if it is an

(PHP 5 >= 5.3.0, PHP 7) Sets the value at the specified $index to $newval

Examples: The Built in Exception class A User defined Exception class can be

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