为什么注销不了cookies Cannot modify header information - headersalready sent by (output started at /home/u370929193/public_html/lx/index.php:11) in /home/u370929193/public_html/lx/index.php on line 50
<?php
date_default_timezone_set('PRC');
echo <<<文件头
<!DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "
http://www.wapforum.org/DTD/xhtml-mobile10.dtd">
<html xmlns="
http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="application/xhtml xml; charset=utf-8"/>
<title>心情</title>
</head>
<body>
文件头;
if($_COOKIE["username"]){
$yh=$_COOKIE["username"];
echo "登记的用户名为：<a href=xue.php>$yh</a>";
echo"<a href='?a=ok'>退出</a>";
include('con.php');
$date=date('Y-m-d H:i');
$ssname=$_POST['name'];
$ok=$_POST['ok'];
if($ok){
if(!$ssname){
echo'<br/>心情不可为空哦！';
}else{
$zc="insert into tzss(id,name,ssname,date) values (null,'$yh','$ssname','$date')";
if(mysql_query($zc))
{echo '<br/>心情发表成功！';}
else {echo'发表失败';}
}}
echo <<<分享
<form method="post" action="index.php">
<br>分享你的心情<br>
<input type="text" name="name" value=
""/>
<input type="submit" name="ok "value="发表" />
</form>
分享;
$ss="SELECT * FROM tzss
WHERE name='$yh'";
$
sss=mysql_query($ss);
while($row=mysql_fetch_array($sss))
{$naes=$row['name'];
$ssnam=$row['ssname'];
$sj=$row['date'];
echo "$naes：$ssnam<br>发表时间：$sj<br>";}
}else{
header("Location:dl.php");
}
if($_GET['a']==ok){setcookie("username","$username",time()-3600);
echo'<p>注销成功！<p>';}
?>