遍历文件夹下的所有文件和子文件夹

function my_scandir($dir)
 {
      $files = array();
      if ( $handle = opendir($dir) ) {
          while ( ($file = readdir($handle)) !== false ) {
              if ( $file != ".." && $file != "." ) {
                  if ( is_dir($dir . "/" . $file) ) {
                      $files[$file] = scandir($dir . "/" . $file);
                  }else {
                      $files[] = $file;
                  }
              }
          }
          closedir($handle);
          return $files;
      }
 }