出错的原因是我设置了cookie.看:
$sql="select m_name,m_pass from member where m_name='".$login_name."' && m_pass='".$login_pass."' order by m_id";
$result=mysql_query($sql);
if (mysql_fetch_array($result)){
setcookie('m_name',$login_name);
//print "<script language=javascript>location.href='xuanze2.php';</script>";
print $HTTP_COOKIE_VARS['m_name'];
exit;}
$sql="select m_name,m_pass from member where m_name='".$login_name."' && m_pass='".$login_pass."' order by m_id";
$result=mysql_query($sql);
if (mysql_fetch_array($result)){
setcookie('m_name',$login_name);
//print "<script language=javascript>location.href='xuanze2.php';</script>";
print $HTTP_COOKIE_VARS['m_name'];
exit;}
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