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Using ecalloc() to create objects is expensive, because the dynamic-size memset() is unreasonably slow. Make sure we only zero the main object structure with known size, as the properties are intialized separately anyway. Technically we do not need to zero the embedded zend_object structure either, but as long as the memset argument is constant, a couple more bytes don't really matter.
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