新手请问PHP限制打开目录有关问题
新手请教PHP限制打开目录问题！
我做了一个打开目录的PHP,其中有个返回上一级目录的功能。
请问怎么才能设置用户只能打开PHP文件所在目录及其子录，而不能返去PHP文件所在目录的上一级目录呢？即点击返回上一级的时候能返回，但最多只能返回到PHP文件所在目录而不能再返回了。
这个PHP很长，不是我写的，我就不发了，因为我也搞不明白，大家告诉我用什么函数，怎么样做就可以了，当然，越具体越好啦。
------解决方案--------------------
没有这样的函数，有也是你自己写的
既然有目录的移动，你就应该检查新目录是否有权进入
------解决方案--------------------
简单，设置执行php的进程的用户的权限即可
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