php - 试图设置 session 变量

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;
}
?>

您好，我正在尝试设置此 session 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 session['admin'] isset 它应该回显管理按钮。 但我不太确定为什么？ (我确实有 session 启动和每个页面上的所有内容，这不是那个或任何“你没有 php 标签”的问题我已经检查了 mysql 查询，它确实从我的表中返回了一些东西。有什么想法吗？

Answer 1

您的 session_start(); 应该位于页面顶部，然后再与 session 变量相关。

来自 the docs :

当调用 session_start() 或 session 自动启动时，PHP 将调用打开和读取 session 保存处理程序。

根据评论编辑:

<?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;
    }
?>

根据更多评论编辑 2:

您必须像这样实际获取数据 - 从 this tutorial 中截取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，当我们讨论它时，您最好还是离开旧的 mysql_* 函数并移动到 PDO哪个更好。