Undefined variable: total
<p>I'm having problems with this</p>

<pre><code>$total += $rows['price'] * $qty;
</code></pre>

<p>Notice: Undefined variable: total in D:\xampp\htdocs\WBPL-MusicLightDev\inc\functions.inc.php on line 42</p>

<pre><code>function wbpl_showCart() {
    global $db;
    $cart = $_SESSION['cart'];
    if ($cart) {
        $items = explode(',', $cart);
        //$contents = array();
        foreach ($items as $item) {
            $contents[$item] = (isset($contents[$item])) ? $contents[$item] + 1 : 1;
        }
        echo '&lt;form action="index.php?page=cart&amp;action=update" method="post" id="cart"&gt;';
        echo '&lt;table border=0 align="center" class="table table-bordered"&gt;';


        foreach ($contents as $id =&gt; $qty) {
            $sql = "SELECT * from wbpl_product WHERE kd_product = '$id'";
            $result = mysql_query($sql) or die(mysql_error());
            $rows=mysql_fetch_array($result);
            //extract($row);

            echo    '&lt;tr&gt;
                        &lt;td&gt;Brand&lt;/td&gt;
                        &lt;td colspan="4"&gt;'. $rows['kd_product'] .'&lt;/td&gt;
                    &lt;tr&gt;
                    &lt;tr&gt;
                        &lt;td&gt;Brand&lt;/td&gt;
                        &lt;td colspan="4"&gt;'. $rows['nama_brand'] .'&lt;/td&gt;
                    &lt;tr&gt;
                    &lt;tr&gt;
                            &lt;td&gt;Instrument Type&lt;/td&gt;
                            &lt;td colspan="4"&gt;'. $rows['nama_instype'] .'&lt;/td&gt;
                    &lt;/tr&gt;
                    &lt;tr"&gt;
                    &lt;td rowspan="2"&gt;Price&lt;/td&gt;
                    &lt;td rowspan="2"&gt;Rp. ' . $rows['price'] . '&lt;/td&gt;
                    &lt;td rowspan="2"&gt;&lt;input type="text" name="qty' . $id . '" value="' . $qty . '" size="2" maxlength="3" /&gt;&lt;/td&gt;

                    &lt;td rowspan="2"&gt;Rp. ' . ($rows['price'] * $qty) . '&lt;/td&gt;

                    &lt;td&gt;&lt;a href="index.php?page=cart&amp;action=delete&amp;id=' . $id . '" class="btn btn-danger"&gt;Hapus&lt;/a&gt;&lt;/td&gt;
                    &lt;/tr&gt;
                    &lt;tr&gt;&lt;td&gt;&lt;br&gt;&lt;/td&gt;&lt;/tr&gt;';
            $total += $rows['price'] * $qty;
        }
        echo '&lt;/table&gt;';
        $qty = getQty();


        echo '&lt;p&gt;Sub Total: &lt;strong&gt; Rp. ' . $total . '&lt;/strong&gt;&lt;/p&gt;';



        //session_register('totalbayar');
        $_SESSION['totalbayar'] = $total;
        echo '&lt;div&gt;&lt;button type="submit" class="btn btn-primary"&gt;Update cart&lt;/button&gt;&lt;/div&gt;';
        echo '&lt;/form&gt;';
    } else {
        echo '&lt;p&gt;Keranjang belanja masih kosong.&lt;/p&gt;';
    }
    //return join('', $output);
}
</code></pre>
