Description:
------------
The interface RecursiveIterator "implements" Iterator, where the syntax requires it to "extends".

Reproduce code:
---------------
interface RecursiveIterator implements Iterator
{
	/** @return whether the current element has children
	 */
	function hasChildren();
	
	/** @return the sub iterator for the current element
	 * @note The returned object must implement RecursiveIterator.
	 */
	function getChildren();
}

Expected result:
----------------
interface RecursiveIterator extends Iterator
{
	/** @return whether the current element has children
	 */
	function hasChildren();
	
	/** @return the sub iterator for the current element
	 * @note The returned object must implement RecursiveIterator.
	 */
	function getChildren();
}

Actual result:
--------------
The interface RecursiveIterator at ext/spl/internals/recursiveiterator.inc is using the wrong syntax "implements" instead of "extends", just like the OuterIterator correctly does for example.

It works anyway but also affects the documentation generated by doxygen.