PHP实现批量清空删除指定文件夹所有内容的方法

<?php// 清文件缓存$dirs = array(  realpath(dirname(__FILE__) . '/../data/cache_data'),  realpath(dirname(__FILE__) . '/../data/cache_file'),  realpath(dirname(__FILE__) . '/../data/cache_view'));// 清理缓存foreach($dirs as $dir) {  do_rmdir($dir, false);  echo "<div style='border:2px solid green; background:#f1f1f1; padding:20px;margin:20px;width:800px;font-weight:bold;color:green;text-align:center;'>/"" . $dir . "/" have been cleaned clear! </div>";}/** * 清空/删除 文件夹 * @param string $dirname 文件夹路径 * @param bool $self 是否删除当前文件夹 * @return bool */function do_rmdir($dirname, $self = true) {  if (!file_exists($dirname)) {    return false;  }  if (is_file($dirname) || is_link($dirname)) {    return unlink($dirname);  }  $dir = dir($dirname);  if ($dir) {    while (false !== $entry = $dir->read()) {      if ($entry == '.' || $entry == '..') {        continue;      }      do_rmdir($dirname . '/' . $entry);    }  }  $dir->close();  $self && rmdir($dirname);}