对于文件管理系统，我想从url在php中创建一些面包屑。每个用户的根目录在url中如下所示：
example.com/sfm?dir=uploads/sfm/root
在rootdir中有一个名为folder1的文件夹单击文件夹1时，url为：
example.com/sfm?dir=uploads/sfm/root/folder1
文件夹1中有一个名为folder2的文件夹当点击该文件夹时，url变为：
example.com/sfm?dir=uploads/sfm/root/folder1/folder2
等等。。。我如何制作一些面包屑，并根据url锚定到文件夹？
如果我理解正确，您想做的是接受$_GET['dir']的争用，并将其按/进行拆分，然后提供指向每个争用的链接。
以下是我的做法：
$crumbs=explode('/',$_GET['dir']); // this splits the sections of $_GET['dir'] separated by / into an array of values
$url_pre=''; // we'll use this to keep track of the crumbs we've sifted through already
// foreach cycles through each element in an array
// $crumbs is the array, and $crumb is the current listing in the array we're looking at
foreach($crumbs as $crumb){
$url_pre .= $crumb;
echo '<a href="?dir='.$url_pre.'">'.$crumb.'</a>';
$url_pre .= '/'; // add this after you echo the link, so that dir doesn't start with a /
}