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ctor/dtor are now no longer called for insert/delete_top operations, only for cloning and freeing of the object. Otherwise elements will have a minimum rc of 2 and GC won't be able to free them.
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