嘿，我正在尝试建立一个模板网站，但它有这个错误。帮我解决一下

Question

  

警告：mysqli_query（）要求参数1为mysqli，在第102行的C：\ xampp \ htdocs \ cms \ includes \ function.php中给出字符串

     

警告：mysqli_error（）期望参数1为mysqli，在第106行的C：\ xampp \ htdocs \ cms \ includes \ function.php中给出null   QUERY FAILED

    $query="INSERT INTO soldiers 
                (soldier_username,soldier_first_name,soldier_last_name,soldier_surname,
                 soldier_address,date_recruited,soldier_age,soldier_mobile_no,
                 soldier_email,soldier_password,soldier_rank,soldier_status) ";

    $query="VALUES('{$soldier_username}','{$soldier_first_name}','{$soldier_last_name}','{$soldier_surname}',
                   '{$soldier_address}',now(),'{$soldier_age}','{$soldier_mobile_no}',
                   '{$soldier_email}','{$soldier_password}','Unranked','Pending')";

    $register=mysqli_query($connection,$query);
    }
    if(!$register)
    {
         die('QUERY FAILED' . mysqli_error($connection));
    }
    redirect("index.php");
}