导出CSV乱码

导出CSV，无论是什么格式，excel打卡都是乱码

需要加上

echo "\xEF\xBB\xBF";

header("Content-Disposition:attachment;filename=$fileName.csv");
		header("Content-Type:$exportType;charset=UTF-8");
		header("Expires: Mon, 31 Dec 2000 00:00:00 GMT" );
		header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT" );
		header("Cache-Control: post-check=0, pre-check=0", false );

		$header = implode("\", \"", $headers);
		$header = "\"" .$header;
		$header .= "\"\r\n";
        echo "\xEF\xBB\xBF";
		echo $header;

		foreach($entries as $row) {
			foreach ($row as $key => $value) {
				/* To support double quotations in CSV format
				 * To review: http://creativyst.com/Doc/Articles/CSV/CSV01.htm#EmbedBRs
				 */
				$row[$key] = str_replace('"', '""', $value);
			}
			$line = implode("\",\"",$row);
			$line = "\"" .$line;
			$line .= "\"\r\n";
			echo $line;
		}