Php unlimited folder traversal example sharing

This article mainly introduces the example of php unlimited folder traversal. For more information, see the latest php directory operations:

The following functions are used:

Isset () determines whether a variable is defined

Chdir () changes the current directory to the specified directory.

Open the opendi () directory.

Readdir () reads the directory.

Getcwd () to get the current directory.

We also use for if GET to transfer the value about these things:

The following code is used:

The code is as follows:
If (isset ($ _ GET ['id']) // determines whether to pass the value
{
$ S = str_replace ('', '+', $ _ GET ['id']);
$ S = base64_decode ($ s); // The passed value is generally the absolute path strength of the directory to be opened.
Chdir ($ s); // switch to the directory to be opened
}
$ A = opendir ('.'); // open the current directory
While (false! ==( $ C = readdir ($ a) // cyclically traverses the file name of the directory content
{
If (is_dir ($ c) // you can determine whether a directory or a file is used.
{
If ($ c = '.')
{
}
Else
{
If ($ c = '..')
{
$ W = base64_encode (substr (getcwd (), 0, strrpos (getcwd (), '\'); // add the directory name to the current path to indicate the absolute path of the Directory.
Echo "upper-level". "Open
"; // When you click open, the absolute path to be opened is passed out. use chdir to switch to the directory to be opened.
} Else
{
$ W = base64_encode (getcwd (). '\'. $ c); // add the directory name to the current path to indicate the absolute path of the Directory.
Echo "$ c". "Open
"; // When you click open, the absolute path to be opened is passed out. use chdir to switch to the directory to be opened.
}
}
}
Else
{
Echo "$ c is not a directory
";
}
}

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