GMC datafeed script

gmc_datafeed.php

<?php
require '/includes/class.common.php';
require '/includes/class.images.php';

// mysql connection
$conn=mysqli_connect("localhost","database","password","database_name");
// Check connection
if (mysqli_connect_errno($conn))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
// Collect data in query
$q = mysqli_query($conn,"SELECT id,isbn13,title,retail,discount, product_inventory.bli as stock,description FROM products
LEFT JOIN product_extras ON products.id = product_extras.product_id
LEFT JOIN product_inventory ON products.id = product_inventory.product_id
LEFT JOIN product_descriptions ON products.id = product_descriptions.product_id");

// Set the xml header
header("Content-type: text/xml");

// xml file meta
echo '<?xml version="1.0"?> 
<rss xmlns:g="http://base.google.com/ns/1.0" version="2.0">
<channel>
<title>store.bibleleague.org</title>
<link>http://store.bibleleague.org</link>
<description>Google Merchant Feed</description>'; 

// while loop, this will cycle through the products and echo out all the variables
while($r = mysqli_fetch_array($q))
{
// collect all variables
$title		=$r['title'];
$link		= 'https://store.bibleleague.org/item/'.$x['id'].'/'.$this->common->formatString($x['title'],'url-link').’”’; //Unsure how to grab this
$description=$r['description'];
$id         =$r['id'];
$price		=$r['retail'];
if ($r['stock'] >= 1){$availability='in stock';}else{$availability='out of stock';}
$image		='http://store.bibleleague.org/#'; //Unsure how to grab this
$gtin		=$r['isbn13'];

// output all variables into the correct google tags
// gtin is isbn13
// category is a string preset by Google. It looks like 'Media > Books'
// unsure how to grab shipping price
echo "<item> 
<title>$title</title>
<link>$link</link>
<description>$description</description>
<g:google_product_category>Media > Books</g:google_product_category>
<g:id>$id</g:id>
<g:condition>new</g:condition>
<g:price>$price USD</g:price>
<g:availability>$availability</g:availability>
<g:image_link>$image</g:image_link>
<g:shipping>
	<g:country>US</g:country>
	<g:service>Standard</g:service>
	<g:price> USD</g:price>
</g:shipping>
<g:gtin>$gtin</g:gtin>
</item>"; 
}
?>