实际在项目过程中，我们经常会遇到要获取上一页地址的路径。你可以返回上一页使用
复制代码 代码如下:
<script>window.history.go(-1);</script>
这个是通过JS来操作的
如果出现这样的场景，当用户需要退出帐号，你又希望他退出后直接在返回当前页面
比如，当前页面的地址为http://xxx/module.php?module=groupbook&view=index&id=2.
你退出系统想必会使用 $_SERVER['REQUEST_URI'] 来 获取当前路径，然后把这个值做为参数传给退出需要返回的路径，这个时候你回发现
他只获取了http://xxx/module.php?module=groupbook 却没有得到&view=index&id=2，也就是说我们退出后返回的地址变成了
http://xxx/module.php?module=groupbook（本应该是http://xxx/module.php?module=groupbook&view=index&id=2）,
这是因为他把&当成第一个的参数了，简单理解为
http://xxx/login.php?op=logout&return=http://xxx/module.php?module=groupbook&view=index&id=2,
变成了
http://xxx/login.php?op=logout&return=http://xxx/module.php?module=groupbook&view=index&id=2。
这个时候我们需要对当前获取的$_SERVER['REQUEST_URI'] 进行转码使用urlencode($_SERVER['REQUEST_URI'])
就可以解决我们的问题
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