Bind_Result始終返回0

Question

這是我的代碼。我試圖讓accountId的價值返回並分配給$ accountId但我總是得到0返回。查詢很好，它返回我想要在PHP中的值我的管理員，但它不會在這裏返回它。你知道爲什麼嗎？

$mysqli = new mysqli($SQLhost, $SQLusername, $SQLpassword, $SQLdatabase); 

    $stmt = $mysqli->prepare("SELECT accountId FROM Account WHERE accountUsername=? AND accountPassword=?"); 
    $stmt->bind_param('ss', $username,$password); 

    $stmt->execute(); 

    $stmt->bind_result($accountId); 

    $_SESSION['accountId'] = $accountId; 

Answer 1

工作代碼：
$的mysqli =新的mysqli（$ SQLHOST，$ SQLusername，$ SQLPASSWORD，$ SQLdatabase）;

$stmt = $mysqli->prepare("SELECT accountId FROM Account WHERE accountUsername=? AND accountPassword=?"); 
    $stmt->bind_param('ss', $username,$password); 

    $stmt->execute(); 

    $stmt->bind_result($accountID); 

    $stmt -> fetch(); 

    $_SESSION['accountId'] = $accountID;