PHP循环遍历文件目录及文件

/****************************
* 获取目录下的所有文件
* [$dir] 文件夹路径
****************************/
function deepScanDir($dir) {
  $fileArr = array ();
  $dirArr = array ();
  $dir = rtrim($dir, '//');
  if (is_dir($dir)) {
    $dirHandle = opendir($dir);
    while (false !== ($fileName = readdir($dirHandle))) {
      $subFile = $dir.DIRECTORY_SEPARATOR.$fileName;
      if (is_file($subFile)) {
        $fileArr[] = $subFile;
      }elseif (is_dir($subFile) && str_replace('.', '', $fileName) != '') {
        $dirArr[] = $subFile;
        $arr = deepScanDir($subFile);
        $dirArr = array_merge($dirArr, $arr['dir']);
        $fileArr = array_merge($fileArr, $arr['file']);
      }
    }
    closedir($dirHandle);
  }
  return array (
    'dir' => $dirArr,
    'file' => $fileArr
  );
}
/****************************
* 将内容写入文件
* [$filename] 文件路径
* [$contents]  文件内容
* [$type]     读写类型
****************************/
function writeFileContents($filename, $contents, $type='a') {
  if (!($fd = fopen($filename, $type))){
    return FALSE;
  }
  if (!fwrite($fd, $contents."\n")) {
    fclose($fd);
    return FALSE;
  }
  fclose($fd);
  return true;
}
//示例:
$dir = "/usr/local/php/test/";
$dirFiles = deepScanDir($dir);
if(!empty($dirFiles['file'])){
  foreach($dirFiles['file'] as $file){
    writeFileContents($file,"Hello",$type='a+');
  }
}