PHP 5.5 is now in its development cycle, currently at the Alpha 4 release. According to the initial release roadmap for PHP 5.5, this is the point where the feature freeze was supposed to happen, but that’s not necessarily going to happen, as at least one key feature may yet still land.
Zend co-founder Zeev Suraski has proposed that the Zend Optimizer+ Opscode cache be directly integrated into PHP 5.5. The TL;dr version is that the Opscode cache makes PHP run faster.
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