Version 3.3.5 of the PHP client was released on January 9, 2015 and is available for download here.
It boasts a number of features (see the full release notes here):
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Upgraded to C client 3.0.94
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Faster close() resulting in faster tests and session handling
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Fixed script that fetches the C client to work with minimal CentOS 7
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Added support for queries without a predicate