由于在5.1.3中发现了一个一个严重的bug，在5.1.3发布3天之后立刻发布本版本修正了先前的问题

[04-May-2006] A critical bug with $_POST array handling as well as the FastCGI sapi have been discovered in PHP 5.1.3. A new PHP release 5.1.4 is now available to address these issues. All PHP users are encouraged to upgrade to this release as soon as possible.