Kode PHP untuk memasukkan nilai kotak centang ke kolom tertentu di mysql dengan formulir pilih

Buat kode php ini

<?php
mysql_connect('localhost', 'username', 'password');
mysql_select_db('myTable');
$val = array();
if (isset($_POST['A']))
    $val[] = $_POST['A'];
if (isset($_POST['B']))
    $val[] = $_POST['B'];
if (isset($_POST['C']))
    $val[] = $_POST['C'];
$value = implode(', ', $val);
if (isset($_POST['select'])) {
    $col = $_POST['select'];
    if ($col == 'Category 1') {
        $query = mysql_query('INSERT INTO myTable(cat1) VALUES($value)');
    }
    else if ($col == 'Category 2') {
        $query = mysql_query('INSERT INTO myTable(cat2) VALUES($value)');
    }
    else if ($col == 'Category 3') {
        $query = mysql_query('INSERT INTO myTable(cat3) VALUES($value)');
    }
}
?>