Question

我正在做一个登录页面。我想在成功登录后刷新页面，以便显示用户名和注销链接，否则显示登录和注册链接。正如我在堆栈溢出答案中看到的，我使用了标题（＆＃39;位置：＆＃39;。$ _ SERVER [＆＃39; HTTP_REFERER＆＃39;]）;它正在工作。但现在它无法显示错误警告：无法修改标头信息 - 已在C：\ Program中发送的标头（在C：\ Program Files（x86）\ EasyPHP-DevServer-14.1VC11 \ data \ localweb \ projects \ myphpproject \ login.php：191中开始输出）第228行的文件（x86）\ EasyPHP-DevServer-14.1VC11 \ data \ localweb \ projects \ myphpproject \ login.php 正如我在特定答案中看到的那样，我将代码粘贴在最顶层。然后什么也没发生。只需刷新页面而无需登录。我想在登录后刷新页面，以便显示用户名和日志链接下面的代码

    <div class="container">
  <header>
  <p class="left">
  <?php
  session_start();
  if(!isset($_SESSION["user_id"]))
  {
  ?>
    <a href="login.php">Login</a>
    <a href="register1.php">Register</a>
    <?php
    }
    else
    { echo $_SESSION["name"];
    ?>
    <a href="logout.php">Log out</a>
    <?php
    }
    ?>
    </p>
    <h1>title</h1>
    <ul id="MenuBar1" class="MenuBarHorizontal">
      <li><a href="index.php">Home</a>

      </li>
      <li><a href="Rooms.html">Rooms</a></li>
      <li><a href="<?php if($_SESSION["username"]=="admin2006") echo "admin.php";  ?>">Admin</a></li>
      <li><a href="#">About us</a></li>
    </ul>



  </header>
  <div class="sidebar1"><!-- InstanceBeginEditable name="EditRegion3" -->
    <aside> <img src="" width="180" height="330" alt="Insert Add" style="background-color:#EADCAE"> </aside>
  <!-- InstanceEndEditable --><!-- end .sidebar1 --></div>
  <!-- InstanceBeginEditable name="EditRegion4" -->
  <article class="content">
    <?php
      include 'connection.php';
      if ($_SERVER["REQUEST_METHOD"] == "POST") {

          if (!preg_match('/^[A-Za-z][A-Za-z0-9]{5,9}$/', $_POST["username"]))  {
              echo "invalid username";
          }
          else if ( !preg_match('/^[A-Za-z][A-Za-z0-9]{5,9}$/', $_POST["password"]) ) {
              echo "invalid password";
          }
          else{

              $username=$_POST["username"];
              $password=$_POST["password"];
              $shapassword=  sha1($password);             
            $sql="select user_id,fname,lname from users "
                      . "where username = '".$username. "'and password = '".$shapassword."'";
            $result = db_query($sql);
            $row= mysqli_fetch_array($result);
            if(!$row)
            {
                $message= "login failed";
            }
          else{         
          $userid= $row["user_id"];
             $_SESSION["user_id"]=$userid;
             $_SESSION["username"]=$username;
             $_SESSION["name"]=$row["fname"]." ".$row["lname"];
             //header('Location: '.$_SERVER['HTTP_REFERER']);               
          }
          }
      }      
      if(!isset($_SESSION["user_id"]))
      {
      ?>
    <h1>Login</h1>
    <section>
     <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="post" name="login_form" class="form"><table width="500">
  <tr>
    <td>Username</td>
    <td><input type="text" name="username" id="username" required></td>
  </tr>
  <tr>
    <td>Password</td>
    <td><input type="password" name="password" id="password" required></td>
  </tr>
  <tr>
    <td>&nbsp;</td>
    <td><input type="submit" name="login" id="login" value="Login"></td>
  </tr>
</table>
</form>
    </section>
    <?php
      }
      else{
      ?>
    <section class="form"><p>welcome <?php echo $_SESSION["name"];?></p></section>
    <?php
      }
      ?>

刷新特定点标题页面（）不起作用

0 个答案: