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session.serialize_handler as igbinary causing "igbinary_unserialize_header: unsupported version"

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http://serverfault.com – I have installed igbinary 1.1.1 from PECL, configured it as serializer for session.serialize_handler in php.ini so that it is shown in phpinfo(). The change was tested - so far everything is fine, but on live server, I can see warnings like this: PHP Warning: igbinary_unserialize_header: unsupported version: 1346458177, should be 1 or 2 in dispatcher.php on line 73 PHP Warning: session_start(): Trying to destroy uninitialized session in dispatcher.php on line 73 PHP Warning: session_start(): Failed to decode session object. Session has been destroyed in dispatcher.php on line 73 These messa (HowTos)