function del_dir($dir){
	if(!file_exists($dir)){
		die('目录不存在');
	}
	$handle_dir = opendir($dir);
	while ($file = readdir($handle_dir)){
		if($file!='.' && $file!='..') {
			$fullpath=$dir.'/'.$file;
		 	if(!is_dir($fullpath)) {
				unlink($fullpath);
			}else{
				del_dir($fullpath);
			}
		}
	}
	closedir($handle_dir);
	return rmdir($dir);
}

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