<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<? session_start();?>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>zhufeng</title>
</head><body>
<? //echo "hello world";?>
</body>
</html>

解决方案 »

  1.   

    上面那是个登陆后的页面,以下是登陆页面:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <?
    require("inc/db_connect.inc"); 
    $sql="select name passwd from user_login where name='$name' and passwd='$passwd'";
    $result=mysql_query($sql,$server_link);
    if(mysql_num_rows($result)==0)
        { $logon_flag=0; }
      else
         { $logon_flag=1;
            mysql_free_result($result);
            echo "验证成功";
           //断开数据库连接
       echo "<script language='javascript'>";
       echo "window.location='admin_list.php';";
       echo "</script>";
           require("inc/db_close.inc");
         }
    ?>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
    <title>login</title>
    </head><body>
    <form name="form1" method="post" action="<? $PHP_SELF?>">
      <table width="100%"  border="0" cellspacing="0" cellpadding="0">
        <tr>
          <td align="center">xingming</td>
          <td align="center"><input name="name" type="text" id="name"></td>
        </tr>
        <tr>
          <td align="center">passwd</td>
          <td align="center"><input name="passwd" type="password" id="passwd"></td>
        </tr>
        <tr>
          <td align="center"><input type="submit" name="Submit" value="提交"></td>
          <td align="center"><input type="reset" name="Submit2" value="重置"></td>
        </tr>
      </table>
    </form>
    </body>
    </html>
      

  2.   

    你违背了session_start()函数前不能有任何输出的规则!
    把<? session_start();?>放到文件开始处