问题: http://bbs.csdn.net/topics/350118147 2.http://www.cnblogs.com/yjf512/archive/2012/09/12/2682556.html 3.https://segmentfault.com/q/1010000000095833 4.http://www.laruence.com/2012/06/14/2628.html 5.php静态绑定的 解释 http://www.godblessyuan.com/2016/05/30/php-%E5%90%8E%E6%9C%9F%E5%BB%B6%E8%BF%9F%E9%9D%99%E6%80%81%E7%BB%91%E5%AE%9A%EF%BC%88%E5%88%9D%E6%AD%A5%E4%BA%86%E8%A7%A3%EF%BC%89/