Question

if(isset($_SESSION['admin'])) {
echo "<li><b>Admin</b></li>";
}

<?php
session_name('MYSESSION');
session_set_cookie_params(0, '/~cgreenheld/');
session_start();

$conn = blah blah
$query2 = 'Select Type from User WHERE Username = "'.$_SESSION['user'].'" AND Type =\'Admin\'';
$result2 = $conn->query($query2);
if($result2->num_rows==1) {
$_SESSION['admin'] = $result2;
}
?>

嗨，我正在尝试设置此会话变量，但它似乎没有设置，我想知道是否有人可以提供帮助。如果会话['admin'] isset，它应该回显管理按钮。但我不太清楚为什么？（我确实有会话开始和每个页面上的所有内容，这不是问题或任何“你没有php标签”我检查了mysql查询，它确实从我的表返回一些东西。有什么想法吗？

Answer 1

在与会话变量有任何关系之前，您的session_start();应位于页面顶部。

来自the docs：

当调用session_start（）或会话自动启动时，PHP将调用open和read会话保存处理程序。

从评论中编辑：

<?php
    session_name('MYSESSION');
    session_set_cookie_params(0, '/~cgreenheld/');
    session_start();
    // Moved to start after answer was accepted for better readability
    // You had the <?php after this if statement? Was that by mistake?
    if(isset($_SESSION['admin'])) 
    {
        echo "<li><b>Admin</b></li>";
    }

    // If you have already started the session in a file above, why do it again here?

    $conn = blah blah;
    $query2 = 'Select Type from User WHERE Username = "'.$_SESSION['user'].'" AND Type =\'Admin\'';
    // Could you echo out the above statement for me, just to 
    // make sure there aren't any problems with your sessions at this point?
    $result2 = $conn->query($query2);
    if($result2->num_rows==1) 
    {
        $_SESSION['admin'] = $result2;
        // It seems you are trying to assign the database connection object to it here.
        // perhaps try simply doing this:
        $_SESSION['admin'] = true;
    }
?>

进一步评论编辑2：

你必须实际获取这样的数据 - 从this tutorial剪切，这可能会帮助你更多：

$query  = "SELECT name, subject, message FROM contact";
$result = mysql_query($query);

while($row = mysql_fetch_array($result, MYSQL_ASSOC))
{
    echo "Name :{$row['name']} <br>" .
     "Subject : {$row['subject']} <br>" .
     "Message : {$row['message']} <br><br>";
}

但话虽如此，在我们谈论它的时候，你最好远离旧的mysql_*功能并转移到PDO，这样会好得多。

Answer 2

将session_start();移至页面顶部。您正在尝试检索未加载的会话。

编辑：如果它甚至包含某些内容，请尝试回显$_SESSION['admin']。同时尝试通过在其中添加if($result2->num_rows==1)或echo('its working');来调试die('its working');代码，以检查$ result2是否包含正好1行，因为目前似乎$ result2包含多于1行或不包含完全没有行。

试图设置会话变量

2 个答案: