注意：未定義的屬性：使用PDO登錄時的stdClass :: $ username

Question

我首次使用PDO創建了一個相當基本的登錄表單。我對PDO相當陌生，無法弄清楚這一點。

我的代碼是：

require_once('setEnv.php'); 
require_once('functions/functions.php'); 

$username = $_REQUEST['username']; 
$password = $_REQUEST['password']; 

$db = classes_pdoDB::getConnection(); 
$query = "SELECT password, salt 
    FROM user 
    WHERE username=:username"; 
$stmt = $db->prepare($query); 
$stmt->execute(array(':username' => $username)); 

while($asd = $stmt->fetchObject()){ 

echo $asd->username; 

} 

，我收到錯誤消息是

Notice: Undefined property: stdClass::$username in /var/www/vhosts/numyspace.co.uk/web_users/home/~unn_v010224/public_html/project/executeLog.php on line 18 

謝謝！

Answer 1

$query = "SELECT password, salt 

您沒有選擇username，所以結果沒有一個。