php.net:

The PHP team is once again proud to participate in the Google Summer of Code. Ten students will "flip bits instead of burgers" this summer_ Zend LLVM Extension by JoonasGovenius, mentored by NunoLopes PHP Optimizer by SamuelGraham Kelly IV, mentored by DerickRethans PhD Improvements and Updates by NicholasSloan, mentored by HannesMagnusson Replace auto* with CMake by Alejandro LeivaRojas, mentored by Pierre A.Joye gsoc_2008 - XDebug by Chung-YangLee, mentored by DavidCoallier Rewrite the run-tests.php script by CesarMontedonico, mentored by TravisSwicegood PHP Bindings for Cairo by AkshatGupta, mentored by AnantNarayanan Algorithm Optimizations by MichalDziemianko, mentored by ScottMacVicar PECL, Website Improvements by BarryCarlyon, mentored by Helgi ŽormarŽorbjörnsson Implement Unicode into PHP 6 by Henrique do NascimentoAngelo, mentored by ScottMacVicar