If checkbox is checked then insert to database

I want to insert into my mysql database only those rows that have a checked checkbox at the end.

Since i have several tables and table data cells that have the same name, then my data is stored in arrays (product_name[] etc.):

    <form action="<?php echo $_SERVER['PHP_SELF'];?>" method="post">
                            <?php    
                                while($res = mysqli_fetch_array($result)) { 

                                    echo "<table id='tbl'>
                                    <thead><th name='category[]'>".$res['category_name']."</th></thead>                                   
                                    <tbody>
                                    <tr>
                                        <td><input name='product_name[]' id='name' type='text'></td>
                                        <td><input name='quantity[]' type='text' value='1'></td>
                                        <td><input type='checkbox' name='check[]'></td>
                                    </tr>
                                    </tbody>";
                            
                                }
                            ?>
                            </table>
                        <div class="bottom-btn">
                            <button id="submit" type="submit">Lisa märgitud külmkappi</button>
                        </div>
</form>

Do i have to store the checkboxes in array as well (check[])?

My php code for the insert:

if ($_SERVER["REQUEST_METHOD"] == "POST") {
        $product_name = $_POST['product_name'];
        $quantity = $_POST['quantity'];
        // $check = $_POST['check'];
            
foreach($product_name as $i=>$product_name)
            {if(!empty($product_name)){

                    $sql = "INSERT INTO products (id, product_name, category, quantity, expiration_date, barcode) VALUES ('','$product_name', '', '$quantity[$i]', '', '')";
                        
                    if($stmt = mysqli_prepare($conn, $sql)){
                        mysqli_stmt_bind_param($stmt, "ss",$param_product_name, $param_quantity);
                        
                        $param_product_name = $product_name;
                        $param_quantity=$quantity;

                        
                        if(mysqli_stmt_execute($stmt)){
                            header("location: myFridge.php");
                        } else{
                            echo "Something went wrong. Please try again later.";
                        }
                        mysqli_stmt_close($stmt);
                    }
            }
        }
   
        mysqli_close($conn);
    }

So far i have tried this: if(!empty($_POST['check'])) and this if(isset($_POST['check']) , but those did not work.

How to check if checkbox is checked before inserting data to database?

If You need any more information, then let me know.

Thank You!