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If count is ZEND_LONG_MIN the count-- loop underflows. This is ultimately harmless, but results in a ubsan warning. Fix this by adding a sanity check that the count isn't negative, because that doesn't make sense...
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