改变为指定的目录。
opendir（） 打开目录。
readdir（）读取目录。
getcwd()。获取当前目录。
还用到了for if GET传值 大概就这些东东：
下面是代码：
<span <?<span php
</span><span if</span>(<span isset</span>(<span $_GET</span>['id']))<span //</span><span 判断是否传值</span>
<span {
</span><span $s</span>=<span str_replace</span>(' ','+',<span $_GET</span>['id'<span ]);
</span><span $s</span>=<span base64_decode</span>(<span $s</span>);<span //</span><span 接受传递的值 值一般是要打开的目录的绝对路劲</span>
<span chdir</span>(<span $s</span>);<span //</span><span 切换到要打开的目录</span>
<span }
</span><span $a</span>=<span opendir</span>('.');<span //</span><span 打开当前目录</span>
<span while</span>(false!==(<span $c</span>=<span readdir</span>(<span $a</span>)))<span //</span><span 循环遍历目录内容的文件名</span>
<span {
</span><span if</span>(<span is_dir</span>(<span $c</span>))<span //</span><span 判断是目录还是文件</span>
<span {
</span><span if</span>(<span $c</span>=='.'<span )
{
}
</span><span else</span><span
{
</span><span if</span>(<span $c</span>=='..'<span )
{
</span><span $w</span>=<span base64_encode</span>(<span substr</span>(<span getcwd</span>(),0,<span strrpos</span>(<span getcwd</span>(),'\\')));<span //</span><span 当前路径加上目录名 就是目录的绝对路径</span>
<span echo</span> "上一级"."<a href='6.php?id=<span $w</span>'>打开</a><br />";<span //</span><span 当点击打开时将要打开的绝对路径传递出去 用chdir 切换到要打开的目录下</span>
}<span else</span><span
{
</span><span $w</span>=<span base64_encode</span>(<span getcwd</span>().'\\'.<span $c</span>);<span //</span><span 当前路径加上目录名 就是目录的绝对路径</span>
<span echo</span> "<span $c</span>"."<a href='6.php?id=<span $w</span>'>打开</a><br />";<span //</span><span 当点击打开时将要打开的绝对路径传递出去 用chdir 切换到要打开的目录下</span>
<span }
}
}
</span><span else</span><span
{
</span><span echo</span> "<span $c</span> 不是目录<br />"<span ;
}
}
</span>?></span>
<span </span>
