Question

我有一个登录表单，当用户提供用户名和密码时，它会导致login.php文件

session_start();
if ( isset( $_POST['username'], $_POST['password'] ) ) {  
    $user   = $_POST['username'] ;
    $pass   = $_POST['password'] ;
    $query  = " MY QUERY "; 
    $result = mysql_query($query) or die('SQL ERROR:'.mysql_error()); 
    $row    = mysql_fetch_assoc($result);   
    if ($row) {         
        echo "query successfull wrote to DB";       
        unset($_SESSION);
        $userName = $row['firstname'].' '.$row['lastname'];
        $_SESSION['userNameSession'] = $userName;
        $_SESSION['loginStatus']     = '1';
        header('location:admin/admin.php');
    }else{
        echo "unscccessful login";
        header('location:index.php');
    }
}

当我尝试通过print_r($_SESSION)从此文件打印会话时...它会显示会话及其变量值

Array ( [userNameSession] => full name [loginStatus] => 1 )

在我的admin/admin.php（成功登录时打开）写

    session_start();
    print_r($_SESSION);exit;

如果尝试按print_r($_SESSION)打印会话，则会将空数组显示为Array()

请帮忙。

Answer 1

为什么要制作unset($_SESSION)？这可能导致会话变量被删除但会话仍然存在。

如果要清除$_SESSION['LoginStatus']和$_SESSION['userNameSession']，请逐一清理（尽管这不是必需的，因为您稍后会重写其值）：

unset($_SESSION['LoginStatus']);
unset($_SESSION['userNameSession']);

代码必须是这样的：

session_start();
if ( !empty($_POST['username']) && !empty($_POST['password']) ) {  
    $user   = $_POST['username'] ;
    $pass   = $_POST['password'] ;
    $query  = " YOUR QUERY "; 
    $result = mysql_query($query) or die('SQL ERROR:'.mysql_error());   
    if (mysql_num_rows($result) > 0) {        
        //DELETE prints BEFORE header()!! -> echo "query successfull wrote to DB"; 
        $row = mysql_fetch_assoc($result);

        unset($_SESSION['userNameSession']);
        unset($_SESSION['loginStatus']);

        $userName = $row['firstname'].' '.$row['lastname'];

        $_SESSION['userNameSession'] = $userName;
        $_SESSION['loginStatus']     = '1';

        header('location:admin/admin.php');
    }else{
        //DELETE prints BEFORE header()!! -> echo "unscccessful login";
        header('location:index.php');
    }
}

Answer 2

您必须注意的一件重要事情：

请勿在标题前回显。我认为您的代码应该是这样的：

session_start();
if ( isset( $_POST['username'], $_POST['password'] ) ) {  
    $user   = $_POST['username'] ;
    $pass   = $_POST['password'] ;
    $query  = " MY QUERY "; 
    $result = mysql_query($query) or die('SQL ERROR:'.mysql_error()); 
    $row    = mysql_fetch_assoc($result);   
    if ($row) {       
        unset($_SESSION);
        $userName = $row['firstname'].' '.$row['lastname'];
        $_SESSION['userNameSession'] = $userName;
        $_SESSION['loginStatus']     = '1';
        header('location:admin/admin.php');
    }else{
        header('location:index.php');
    }
}

希望这有帮助。

会话变量没有进入另一个内部文件PHP

2 个答案: