PHP未在mysql表中插入數據

Question

真正簡單的代碼

$device = $_GET['device'];
$voltage = $_GET['voltage'];
$current = $_GET['current'];
$power = $current * $voltage;

mysqli_query($connect, "insert into device$device (time, voltage, current, power)
    values (curtime(), $voltage, $current, $power);");

問題是，無論我輸入什么設備號，它都可以正常工作。 它僅適用於設備1。沒有對mysql數據庫或php代碼進行任何更改，只是突然不再起作用，除非$device=1 。

也沒有錯誤報告。

Answer 1

$device1 = $_GET['device']; 
 $device = "device".$device1;
  mysqli_query($connect, "insert into  '".$device." (time, voltage, current, power)
values (curtime(), '$voltage', '$current', '$power')");

變更查詢

Answer 2

mysqli_query($connect, "insert into device'".$device."' (time, voltage, current, power)
values (curtime(), $voltage, $current, $power);");

要么

mysqli_query($connect, "insert into device".$device." (time, voltage, current, power) values (curtime(), $voltage, $current, $power);");

因為$device是一個整數。