PHP读取xml文件在火狐、Safari浏览器下显示乱码但在ie下显示正常

[唐僧娶妻]

下面是我的PHP读取xml的代码。用浏览器读取news.xml文件是正常的。但打开php文件就是乱码。各位大虾能指点一下不？谢谢！！

<?php
$doc = new DOMDocument('1.0', 'utf-8');
$doc->load('news.xml');

$news = $doc->getElementsByTagName("news");
foreach($news as $elem)
{
	$titles = $elem->getElementsByTagName("title");
	$title = $titles->item(0)->nodeValue;

	$authors = $elem->getElementsByTagName( "author" );
	$author = $authors->item(0)->nodeValue;

	$dates = $elem->getElementsByTagName( "date" );
	$date = $dates->item(0)->nodeValue;

	$contents = $elem->getElementsByTagName( "content" );
	$content = $contents->item(0)->nodeValue;

	$keywordss = $elem->getElementsByTagName( "keywords" );
	$keywords = $keywordss->item(0)->nodeValue;

	echo "$title - $author - $date - $content - $keywords";
}
?>

[果酱很好吃]

页面顶部加入 header("Content-type:text/html;charset=utf-8");