在MYSQL UPDATE中获取表中的指定id

Question

The problem here is I can't get a designated "id" when I tried to update a row table.

<?php
if(isset($_POST['btn-input'])){
    $username = $_POST['username'];
    $name = $_POST['farmername'];
    $numofchicks = $_POST['numofchicks'];
    $price = $_POST['price'];
    $weight = $_POST['weight'];
    $get_id = $_GET['get_id'];

  //Outgoing
    mysqli_query($dbconn, "INSERT INTO chickens_out(username, farmername, numofchicks, price, weight) VALUES('{$username}','{$name}', '{$numofchicks}', '{$price}', '{$weight}')");
    mysqli_query($dbconn, "UPDATE chickens_out SET price = price * $weight * $numofchicks WHERE id = '$get_id'");   
}

</div>

Answer 1

Why all have $_POST and it has $get_id = $_GET['get_id'];.

Should it be :

$get_id = $_POST['get_id'];