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怎么设置html页头

WBOYOriginal: 2016-06-13 12:30:182739browse

如何设置html页头

本帖最后由 dd0607 于 2014-01-06 01:42:27 编辑 index.php

<?php<br />
include("include/conn.php");<br />
include("header.php");<br />
include("footer.php");<br />
?>

conn.php

<?php <br />
$host='localhost';  <br />
$user_name='root';  <br />
$password='123123';<br />
$db='netbox';<br />
$conn = mysqli_connect($host,$user_name,$password,$db) or die("Connect failed: " . mysqli_connect_error());<br />
?><br />

header.php

<br />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><br />
<html xmlns="http://www.w3.org/1999/xhtml"><br />
<head><br />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><br />
<meta http-equiv="X-UA-Compatible" content="IE=edge" /><br />
<title>test</title><br />
<link href="/css/main.css" rel="stylesheet"><br />
</head><br />
<body><br />

footer.php

<br />
</body><br />
</html><br />

当index.php不加载conn.php，页面显示正常
当加载conn.php后，页面会自己添加html/head/body等html标签，同时去除了我header.php里的DOCTYPE/html/head，其他内容则统统丢进body里，这是什么原因造成的呢？

PS：加载conn.php后右击页面查看源码，是正常的，但显示是有问题的会在页面顶部顶出一行空白，IE11和Chrome33按F12查看HTML代码就会发现已经不正常了

刚从ASP转PHP，ASP这样逻辑写法是没问题，不懂PHP问题出在哪里

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