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关键时刻出现了一点小疑点 求高手

WBOY
WBOYOriginal
2016-06-13 13:32:08768browse

关键时刻出现了一点小问题 求高手
[code=PHP][/code]
ession_start() [function.session-start]: Cannot send session cache limiter - headers already sent 出现了这样的一个情况 请问这个是什么情况 

include("conn.php");
$username = trim($_POST['username']);
$paw = md5(trim($_POST['paw']));
$post=$_POST['check'];
$errmsg = '';
if (!empty($username)) { 
  if (empty($username)) {
  $errmsg = '数据输入不完整';
  }
  if(empty($errmsg)) { 

   
  if (mysqli_connect_errno()) {
  $errmsg = "数据库连接失败!\n";
  }
  else {
   
  $sql = "SELECT * FROM user WHERE username='$username' AND pwd='$paw'";
  $result = mysql_query($sql);
  if ($result && mysql_num_rows($result) > 0 && $post==$_SESSION[check_pic]) {  
  echo "<script>alert('登陆成功');window.location.href='../admin/index.php'</script>";
   
}else {
  echo "<script>alert('用户名或者密码和验证码不正确');window.location.href='login1.php'</script>";
  }
   
  mysql_free_result($result);
mysql_close($db);
  }
  }
}

?>
这个是程序的代码

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