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SplDoublyLinkedList, SplObjectStorage and ArrayObject have empty constructor (no arg), so it make sense to allow to unserialize empty data. This allow the hack (used in various place, including PHPUnit) to instanciate class without call to constructor to work.
This is an extension that aims to implement some efficient data access interfaces and classes. You'll find the classes documented using php code in the file spl.php or in the corresponding .inc file in the examples subdirectory. Based on the internal implementations or the files in the examples subdirectory there are also some .php files to experiment with. For more information look at: http://php.net/manual/en/book.spl.php