PHP 语言是开放源代码语言，由PHP 开发小组及全世界的PHP 爱好者时刻进行着维护和更新，不断增强其功能，所以在网络上不断地会涌现大量的PHP 的电子参考手册，在书店和图书馆里，有关PHP 的图书也是汗牛充栋-Open source PHP language is a language developed by PHP PHP development team and the fans around the world for the maintenance and update time, and constantly enhance its function, so the network will continue to emerge on a large number of electronic reference manual for PHP, in bookstores and library, is also a voluminous book on PHP