Shopping Cart input => email

[Dorkmind]

Hi everyone i made a shopping cart using PHP and MYSQL table. I am kind of an amateur in php and i would like to have an online store, so the basic problem is i have a website and a Shopping Cart, but i don't know what to do, so when a buyer presses buy now, the content of shopping cart will be sent to my email, so i would know what he bought. So can you tell me how to implement a button BUY NOW that will if pressed send me a content of shopping cart straight to my email.Here is the code. I have a table called products in my mysql database.

    <?php 
if(isset($_POST['submit'])){
    foreach ($_POST['quantity'] as $key => $val)
    {
        if ($val==0)
        {
            unset ($_SESSION['cart'][$key]);
        }
        else
        {
            $_SESSION['cart'][$key]['quantity']=$val;
        }
    }
}


?>



<h1> Cart </h1>
<form method="post" action="index.php?page=cart">

<table>

    <tr>
        <th>Name</th>
        <th>Quantity</th>
        <th>Price</th>
        <th>All Price </th>
     </tr>

     <?php

        $sql="SELECT * FROM products WHERE product_id IN (";

                            foreach($_SESSION['cart'] as $id => $value)
                            {
                                $sql.=$id.",";
                            }

                                $sql=substr($sql, 0, -1).") ORDER BY name ASC";
                                $query=mysql_query($sql);
                                $totalprice=0;

                                while($row=mysql_fetch_array($query))
                                {
                                    $subtotal=$_SESSION['cart'][$row['product_id']]['quantity']*$row['price'];
                                    $totalprice+=$subtotal;
                                    ?>

                                        <tr>
                                            <td><?php echo $row['name'] ?></td>
                                            <td><input type="text" name="quantity[<?php echo $row['product_id']?>]" size="5" value="<?php echo $_SESSION['cart'][$row['product_id']]['quantity'] ?>"/></td>
                                            <td><?php echo $row['price']?>€</td>
                                            <td><?php echo $_SESSION['cart'][$row['product_id']]['quantity']*$row['price']?>€</td>

                                            </tr>
                                            <?php
                                }
                                ?>
                                <tr>
                                    <td> To Pay: <?php echo $totalprice ?></td>
                                </table>
               <br/><button type="submit" name="submit"> Refresh</button>


                 </form>

                 <p> To remove product set to  0.</p>