insert array into database

Saya mempunyai array yang data nya diambil dari mesin finger print dan sudah berhasil untuk menampilkan data nya pada web browser, tetapi tidak berhasil saat insert data ke dalam database

<?php

require 'zklibrary.php';

$zk = new ZKLibrary("192.168.1.201", 4370);
$zk->connect();
$zk->disableDevice();

//$nama = $zk->getUser();
$users = $zk->getAttendance();
////////////////////////////

//var_dump($users);
//echo '<br>----------<br>';
//var_dump($times);
?>
<table width="100%" border="1" cellspacing="0" cellpadding="0" style="border-collapse:collapse;">
<thead>
  <tr>
    <td width="25">No</td>
    <td>UID</td>
    <td>ID</td>
    <td>Name</td>
    <td>Role</td>
    <td>Password</td>
	  <td>Password</td>
	  <td>Password</td>
  </tr>
</thead>
<tbody>

<!--koneksi database-->
<?php
$servername = "localhost";
$username = "root";
$password = "rootroot";
$dbname = "db_fp";

$connection = mysqli_connect($servername, $username, $password, $dbname);
if (!$connection){
        die("Connection Failed:".mysqli_connect_error());
    }
?>
<!-------------------->

<?php
$no = 0;
foreach($users as $key => $user)
{

  $uid = $key;
  $id = $user[0];
  $state = $user[1];
  $time = $user[2];
  $sql = mysqli_query("insert into person(uid, id, state, time) values  ('$uid', '$id', '$state', '$time')");
  //$query = ("SELECT * FROM person");

  $no++;
  ?>
  <tr>
    <td align="right"><?php echo $no; ?></td>
    <td><?php echo $key; ?></td>
    <td><?php echo $user[0]; ?></td>
    <td><?php echo $user[1]; ?></td>
    <td><?php echo $user[2]; ?></td>
    <td><?php echo $user[3]; ?></td>
	  <td><?php echo $user[4]; ?></td>
	  <td><?php echo $user[5]; ?></td>
    <?php if (sql){
      echo $sql;
    }else{
      echo "gagal";
    } ?>
  </tr>
  <?php
}
?>
</tbody>
</table>

<?php
$zk->enableDevice();
$zk->disconnect();

?>

Untuk koneksi database sudah successfully dan sudah dicoba untuk SELECT* FROM tabel database juga berhasil. Mohon bantuannya

Kontak : barkahibnu.1234@gmail.com