PHP traverses all files in the XP folder

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<? PHP
// PHP traverses all files in the folder
$ Handle = opendir ('C: \ '); // I want to traverse the C drive file
Echo "directory handle: $ handle <br/> ";
Echo "file: <br/> ";
While ($ file = readdir ($ handle )){
$ File = iconv ('gb2312', 'utf-8', $ file); // convert xp gbk encoding to utf8
Echo "$ file <br/>"; // output file name
}
Closedir ($ handle );
?>