未定義指數：USER_NAME

Question

當我嘗試使用從$ _SESSION的USER_NAME我得到的錯誤

'未定義指數：USER_NAME'

CODE：

$_SESSION['signed_in'] = true; 

    while ($row = $query1->fetch(PDO::FETCH_ASSOC)) 
    { 
    $_SESSION['user_id'] = $row['user_id']; 
    $_SESSION['user_name'] = $row['user_first_name']; 
    } 

    echo 'Welcome, ' . $_SESSION['user_name'] . '. <a href="index.php">Proceed to the overview page to see your tasks</a>.'; 

Answer 1

添加session_start（）;在您的頁面頂部開始會話。