文件夹是否为空
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$root = dirname(__FILE__);$root = str_replace("\\", "/", $root);$path = $root.'/test/';$isempty = file_exit();//检查目录是否为空function file_exit($filelastname = ''){global $path;if($filelastname != ''){   $handle = opendir($path.$filelastname);}else{   $handle = opendir($path); }while (false !== ($file = readdir($handle))) {   if($file == '.' || $file == '..'){    continue;   }   $file_array[] = $file;}if($file_array == NULL){//没有文件   closedir($handle);   return false;}closedir($handle);return true;//有文件}