http://bbs.phpchina.com/thread-228725-1-1.html
http://www.cnblogs.com/artech/p/3506553.html
http://www.cnblogs.com/springyangwc/archive/2012/01/18/2325784.html
http://blog.csdn.net/dyllove98/article/details/8644253
http://www.cnblogs.com/yuzhongwusan/p/3152526.html
http://www.thinkphp.cn/topic/11567.html