php-不能打印mysqli_result

Question

我无法回应我的mysql查询的结果。 PHP代码是：

$getc = "SELECT credits FROM members WHERE Phone ='".$_SESSION['Phone']."'";
$credits = mysqli_query($dbc,$getc);
echo "YOU HAVE $credits CREDITS LEFT";

但是上面显示了以下错误： 可捕获的致命错误：类mysqli_result的对象无法在第204行的file.php中转换为字符串

出了什么问题？

Answer 1

您只是在执行查询而不是获取结果，mysqli_query()会返回mysqli_result而不是字段的值

$getc = "SELECT credits FROM members WHERE Phone ='".$_SESSION['Phone']."'";
$result = mysqli_query($dbc,$getc);
$row = mysqli_fetch_assoc($result);
echo "You have {$row['credits']} left!";