Description:
------------
Calling SessionHandler::destroy() multiple times destroys only first session.

Test script:
---------------
// Basic setup.
$handler = new \SessionHandler;
session_set_save_handler($handler);
session_start();

// Array of session IDs.
$sessionsToDestroy = array(
	'sessionId1',
	'sessionId2',
	'sessionId3',
);

// Attempt to destroy the sessions.
foreach ($sessionsToDestroy as $sessionId)
{
	$handler->destroy($sessionId);
}

Expected result:
----------------
All passed sessions destroyed.

Actual result:
--------------
Only the first session is destroyed.