PHP解决浏览器 上载文件 中文名称乱码有关问题-兼容大多浏览器

function sendFile($serverPath, $filename,$charset = 'UTF-8', $mimeType = 'application/octet-stream'){	// 文件名乱码问题	if (preg_match("/MSIE/", $_SERVER["HTTP_USER_AGENT"])) {		$filename = urlencode($filename);		$filename = str_replace("+", "%20", $filename);// 替换空格		$attachmentHeader = "Content-Disposition: attachment; filename=\"{$filename}\"; charset={$charset}";	} else if (preg_match("/Firefox/", $_SERVER["HTTP_USER_AGENT"])) {					$attachmentHeader = 'Content-Disposition: attachment; filename*="utf8\'\'' . $filename. '"' ;	} else {		$attachmentHeader = "Content-Disposition: attachment; filename=\"{$filename}\"; charset={$charset}";	}			$filesize = filesize($serverPath);	//header("Pragma: public");   header("Expires: 0");	header("Cache-Control: must-revalidate, post-check=0, pre-check=0");	header("Content-Type: application/force-download");	header("Content-Type: {$mimeType}");	header($attachmentHeader);	header('Pragma: cache');	header('Cache-Control: public, must-revalidate, max-age=0');	header("Content-Length: {$filesize}");	readfile($serverPath);	exit;}