请教这个PHP调用的MYSQL数据为什么乱码了

function writeStatistic($sql,$txt_name){
	$filename="".$txt_name;//注意修改文件的路径
	if (file_exists($filename)) {
		$fp=fopen($filename,"a+");
	}else{
		$fp=fopen($filename,"w+");
	}

	$text=$sql."\r\n";
	fwrite($fp,$text);
	fclose($fp);
}
/**
* 向指定文件写入字符集设置句柄
*
* 参数: string $txt_name : 指定文件名
* 返回: void
* 作用域: public
*/
function writeStatistic_set_name($txt_name){
    $set_name="
";
	//转化为utf-8编码
	
	$filename="".$txt_name;//注意修改文件的路径
	if (file_exists($filename)) {
		unlink($filename);
		$fp=fopen($filename,"a+");
	}else{
		$fp=fopen($filename,"w+");
	}

	$text=$set_name."\r\n";
	fwrite($fp,$text);
	fclose($fp);
}
$nowDate = date("Y-m-d");
$txt_name='sitemap.xml';
writeStatistic_set_name($txt_name);
$sql="select * from jieqi_article_article ORDER BY lastupdate DESC";
$db->query($sql);
for($i=1;$i<= $db->num_rows();$i++){
	$db->next_record();
	$siteid = $db->f(siteid);
	$haha = _;
	$articleid = $db->f(articleid);
	$newname = $db->f(articlename);
	$newid = $db->f(lastchapterid);
	$nowDate = $db ->f(lastupdate);
	$nowDate = date("Y-m-d H:m:s",$nowDate);
	$url = "
	
	http://www.1.org/html/$articleid/$newid.html 
	$nowDate
	always
	1.0
	$newname
	";
	//转化为utf-8编码
	$url = utf8_encode($url);
	writeStatistic($url,$txt_name);
}
$db->free();
$over='';
writeStatistic($over,$txt_name);
print "Google Sitemap生成结束!
点击这里查看";
exit;
?>