我只有一个网站，但是绑定了两个域名www.a.com和www.b.com，两个域名都指向网站的顶级目录index.php，使用www.a.com登陆了之后，再去访问www.b.com的时候依然是未登录状态。我想实现用户登陆了a之后，访问b也是登陆的状态，请问如何做到？
注：请不要跟我谈UCenter，我只有一个站，没有论坛等乱七八糟的，我只想跨域共享session或者cookie，求有经验的前辈指点一条明路，节省我走弯路的时间。
回复讨论(解决方案)
搜 SSO 单点登录。
session不可以吗
只能跨二级域名，这个问题不谈了，现在又在思考JS跨域刷新主页面的问题
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码农场??码农播种代码、放牧思想的农场！session不可以吗
很遗憾 cookie不能跨域，sessionid无法共享，session内容就无法共享了。。。
若是同域的就好解决了。。。
好想session和cookie不能实现你那个功能吧！
应该跟session的跨域有关。。。。。既然默认的session不能跨域共享那你何不修改下session，用数据库来存储呢？重写session
如果是同一级子域名
www.a.com,admin.a.com,可以通过设置 setcookie的 第四个参数 domain 就可以了,cookie 通了 保存的 sessionid 也就通了,
但你这个是两个不同的域名,
可以使用数据库存储session的方式,把session存入数据库,用的时候在从数据库取出来,当然这有个弊端就是用户量大的时候要频繁的操作数据库,压力不小,不过没关系,你可以使用缓存memcache,
用 数据库+缓存(memcache)的方式存解决session跨域问题(其实已经不是session了),
不知道我所说的有用不...
楼上讲得都很好，慢慢尝试
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码农场??码农播种代码、放牧思想的农场！
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