Question

当管理员登录时，他可以在主页选项卡上看到所有已注册的人员，包括他们的个人详细信息，但是当我导航到电子邮件选项卡并返回到主页选项卡时，所有这些数据都无法看到。我怀疑它与会话有关，任何人都可以帮助我。

以下是管理员登录时的脚本：

<?php 
   session_start();
   include_once 'navrequire.php'; 
      if(isset($_POST['usern']))
       {
           $usern = $_POST['usern'];
           $pass = $_POST['pass'];

           //session
           $_SESSION['usern']=$usern;

         //escaping
           $usern = stripcslashes($usern);
           $pass = stripcslashes($pass);
           $usern = mysql_real_escape_string($usern);
           $pass = mysql_real_escape_string($pass);


             $servername = "localhost";
             $username = "root";
             $password = "";
             $dbname = "dbname";

// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);

 //Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$query1 = "SELECT * FROM admin WHERE username='$usern' AND password='$pass'";

$validator = mysqli_query($conn, $query1)
 or die("Error establishing connection" .mysql_error());

$row1 = mysqli_fetch_array($validator);


 if($row1['username'] == $usern and $row1['password']== $pass){

echo '<div id="greet">Hello ' .$_SESSION['usern'].'</div> <br><br>';

$sql = "SELECT owner.firstname, owner.middlename, owner.lastname, ownerdetails.cpno, unitmembers.members, unitowner.unitNo, unitowner.squareMtrs
FROM unitowner INNER JOIN (unitmembers INNER JOIN (ownerlogindetails INNER JOIN (ownerdetails INNER JOIN owner ON ownerdetails.ownerDetId = owner.ownerId) ON ownerlogindetails.ownerLogDetId = owner.ownerId) ON unitmembers.unitMemId = owner.ownerId) ON unitowner.unitOwnId = owner.ownerId;";
$result = $conn->query($sql);
echo "<table border='1'>
<tr>
<th>Firstname</th>
<th>Middlename</th>
<th>Lastname</th>
<th>Unit Members</th>
<th>Unit No.</th>
<th>Unit Squaremeters</th>


<th>
</tr>";
if ($result->num_rows > 0) {
    // output data of each row
    while($row = mysqli_fetch_array($result))
        {
            echo "<tr>";
            echo "<td>" . $row['firstname'] . "</td>";
            echo "<td>" . $row['middlename'] . "</td>";
            echo "<td>" . $row['lastname'] . "</td>";
            echo "<td>" . $row['members'] . "</td>";
            echo "<td>" . $row['unitNo'] . "</td>";
            echo "<td>" . $row['squareMtrs'] . "</td>";
            echo "</tr>";
        }
        echo "</table>";

        } else {
            echo "0 results";
       }
}

else {
    header("Location: error.php");
}
$conn->close();


      }

 ?>
 </center>

这是邮件页面：

<!DOCTYPE html>
<title>Mail</title>
head>

<?php 
session_start();
include_once 'navrequire.php'; 
echo 'Hello ' .$_SESSION['usern'];
?>
</head>
<body>

</body>
</html>

和navrequire.php

<!DOCTYPE html>

<title>headerInc</title>
<style>
        body {margin: 0;}

     ul {
    list-style-type: none;
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: #333;
}

li {
    float: left;
}

li a, .dropbtn {
    display: inline-block;
    color: white;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

li a:hover, .dropdown:hover .dropbtn {
    background-color: #4CAF50;
}

/*ul li a:hover:not(.active) {background-color: #111;}

ul li a.active {background-color: #4CAF50;}*/
li.dropdown {
    display: inline-block;
}

.dropdown-content {
    display: none;
   position: absolute;
    background-color: #f9f9f9;
   min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    z-index: 1;
}

.dropdown-content a {
    color: black;
    padding: 12px 16px;
    text-decoration: none;
    display: block;
    text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1}

.dropdown:hover .dropdown-content {
    display: block;
}


@media screen and (max-width: 600px){
      ul li.right,
      ul li {float:none;}
}
</style>
<body>
 <ul>
  <li><a href="adminlog.php">Overview</a></li>
  <li><a href="mail.php">Mails</a></li>
  <li class="dropdown">
    <a href="javascript:void(0)" class="dropbtn">?</a>
    <div class="dropdown-content">
      <a href="destroyer.php">Logout</a>
    </div>
  </li>
</ul>
    <br><br><br>
</body>
</html>

Answer 1

问题发生在邮件页面。

<?php session_start(); 必须在页面的顶部。之前没有HTML。

导航到另一个选项卡并返回上一个选项卡后，数据消失了 - php

1 个答案: