网络与网站技术的发展,数据加密在企业信息网络中的应用越来越广。针对PHP数据加密的特点,探讨了PHP内置的加密函数crypt()、md5()以及扩展库━Mcrypt、Mhash在身份验证等网络安全中的应用-With the development of the Web s technology,the data encryption in the enterprise s information network has more and more applications.The PHP built-in encryption function-crypt()、md5() and application of PHP s extension library-Mcrypt and Mhash are discussed in authentication and network security.