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with the removal of the unserialize O: bypass in https://bugs.php.net/bug.php?id=67072 now a bunch of userland tools are broken with 5.6, as there is no easy way to instantiate internal classes without calling their constructors.
as explained on the mailing list(http://www.serverphorums.com/read.php?7,959450,987654#msg-987654) and in the pull request(https://github.com/php/php-src/pull/733), the current limitation in the Reflection::newInstanceWithoutConstructor() method is rather arbitrary, so making it less rigid would allow the affected userland libs/tools to have a clear upgrade path.
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