How To: Add Conversion Tracking on Thankyou page?

the link for the tracking.gif ends after the (correct) subtotal

This means you’re causing an error. Enable WP_DEBUG to see PHP errors.

After enabling WP_DEBUG the “order received” page shows (instead of the tracking.gif):

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/ajax-thumbnail-rebuild/ajax-thumbnail-rebuild.php:26) in /Applications/MAMP/htdocs/wpksonline/wp-content/themes/wpksblog/woocommerce/checkout/thankyou.php on line 59

Above the regular page I get (on every page):

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; AjaxThumbnailRebuild has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/ajax-thumbnail-rebuild/ajax-thumbnail-rebuild.php on line 26

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; CPTO has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/post-types-order/include/cpto-class.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; RE_Log has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/redirection/models/log.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; RE_404 has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/redirection/models/log.php on line 140

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Red_Match has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/redirection/models/match.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Red_Action has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/redirection/models/action.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; Red_Item has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/plugins/redirection/models/redirect.php on line 3

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; pippin_recent_posts has a deprecated constructor in /Applications/MAMP/htdocs/wpksonline/wp-content/themes/kickstart/inc/plugin/widgets/recent-posts-widget.php on line 15

FYI: “wpksblog” is a child theme from Kickstart.

Don’t see a fatal so it won’t cut off, but you should probably take care of redirection plugin and move your session_start() elsewhere. It’s too late. Is it even needed?

Sorry, I didn’t see that there was a warning, hidden in the IMG tag.

Only the first tracking image (checkout/thankyou.php) is replaced* with the message above, in the second image (only for testing, order/order-details.php) there is the hidden warning:

<img style="width:1px; height:1px" src="https://externalhost.xyz/tracking.gif?referrerid=&date=2016-03-09%2012:26pm&purchaseTotal=78.5<br /> <b>Warning</b>: Invalid argument supplied for foreach() in <b>/Applications/MAMP/htdocs/wpksonline/wp-content/themes/wpksblog/woocommerce/order/order-details.php</b> on line <b>74</b><br /> " alt=".">

This is line 74:
foreach ($order_items as $item_id => $item) {

After deleting the line if (!session_id()) { session_start(); }; the warning message is gone, but nothing else changed. Not the link and also not the hidden warning message inside the second tracking image. But at the end only one of them has to work, preferably the one in the thankyou.php.

* It’s not really replaced, it only looks like it, because the tracking image is now under the warning message, but with debug on the alt text (a simple dot) for the (because of testing) non-existing image is not shown.

$order_items does not exist. The variable you set is called $items

After changing this line in order/order-details.php to …
$items = $order->get_items();

… there is only this message in the content area:

<h1>Error thrown</h1>
<p>Call to a member function get_sku() on null</p>

After changing the code into …

<?php date_default_timezone_set('Europe/Berlin');
global $product;
if ( get_query_var('referrerid') != '' ) { $referrerid = get_query_var('referrerid'); $_SESSION['referrerid'] === $referrerid; }; if(isset($_SESSION['referrerid'])) { $sess_referrerid = $_SESSION['referrerid']; } ?>

<img alt="." src="https://externalhost.xyz/tracking.gif?referrerid=<?php echo $sess_referrerid; ?>&date=<?php echo date('Y-m-d'); ?>%20<?php echo date('h:ia'); ?>&purchaseTotal=<?php echo $order->get_subtotal( $item ) ?><?php
		$counter = 0;
		$items = $order->get_items();
			foreach ($items as $item) {
			$counter++;
			$_product     = apply_filters( 'woocommerce_order_item_product', $order_item['data'], $order_item, $order_item_key );
			$product_id   = apply_filters( 'woocommerce_order_item_product_id', $order_item['product_id'], $order_item, $order_item_key );
			$manufacturer = wp_get_post_terms( $_product->id, $attribute['name'], 'pa_hersteller' );

			?>&p<?php echo $counter; ?>=sku=<?php echo $order_item['sku']; ?>;singlePrice=<?php echo $order_item['price']; ?>;qty=<?php echo $order_item['quantity']; } ?>" style="width:1px; height:1px" />

… this error message is gone and the GIF is not cutted anymore, but it’s still empty:
<img style="width:1px; height:1px" src="https://externalhost.xyz/tracking.gif?referrerid=&date=2016-03-10%2003:31pm&purchaseTotal=78.5&p1=sku=;singlePrice=;qty=&p2=sku=;singlePrice=;qty=" alt=".">

I don’t know where you got this code but its rife with errors and needs to be looked at properly, not just copy/pasting from resources.

The next error for example, yes it will error, because you’re looping over $items, using $item as the variable for a line. Then further down you’re using $order_item['data'] instead of $item['data']. This again needs correction.

Ok, that’s my fault. I only copied the code from checkout/thankyou.php into order/order-details.php (and adjusted it a little bit) for testing, but I thought that it would be better to integrate this into the thankyou.php, because it should be only generated on the “Thank you” page. If it’s only possible in the order-details.php, probably it has to be wrapped into an if-query.

But even with “$item” the image link remains the same. I guess this issue is too difficult to implement with my level of knowledge in PHP.

You should start with this to get the code into the page:

https://docs.woothemes.com/document/custom-tracking-code-for-the-thanks-page/

Start with the order data as your foreach is also wrong. Get the first part working first.

Big thanks for the link and thanks also for the help so far.

Is there any documentation for the correct notations to get the needed details via PHP? Or is it maybe possible to get more concrete assistance?

Last days I got the information, that this now should be implemented via JavaScript and not via image. With the following code the foreach and the counter are working, but the item details aren’t added and I can’t find any error message (even with $key or $product instead of $item).

add_action( 'woocommerce_thankyou', 'my_custom_tracking' );

function my_custom_tracking( $order_id ) { 

$order = wc_get_order( $order_id ); ?>

<script type="text/javascript" src="tracking.js"></script>
<script type="text/javascript">
var order = kswp.purchaseTracking.createOrder();
order.purchasetotal = <?php echo $order->get_subtotal( $item ); ?>;
order.currency = 'EURO';
<?php $counter = 0;
		$items = $order->get_items();
		foreach ($items as $key => $product) {
			$counter++; ?>
order.sku<?php echo $counter; ?> = '<?php echo $item['sku']; ?>';
order.name<?php echo $counter; ?> = '<?php echo $item['title']; ?>';
order.unitprice<?php echo $counter; ?> = <?php echo $item['price']; ?>;
order.qty<?php echo $counter; ?> = <?php echo $item['quantity']; ?>;
<?php } ?>
</script>

<?php } ?>

The order classes:

https://docs.woothemes.com/wc-apidocs/class-WC_Abstract_Order.html
https://docs.woothemes.com/wc-apidocs/class-WC_Order.html

You have the get_items loop right. You’ve just made an error because $item doesn’t exist in your code. $product does.

<?php echo $order->get_subtotal( $item ); ?>

Is also wrong. $order->get_total(); is enough.

Sorry for my late reply. Last days I thought that the tracking script is not needed any more, therefore I had to clarify the situation. But that was only a missunderstanding.

As I described in my last post, even with $product the behaviour is the same, the item details are still empty:

add_action( 'woocommerce_thankyou', 'my_custom_tracking' );

function my_custom_tracking( $order_id ) { 

$order = wc_get_order( $order_id ); ?>

<script type="text/javascript" src="tracking.js"></script>
<script type="text/javascript">
var order = kswp.purchaseTracking.createOrder();
order.purchasetotal = <?php echo $order->get_subtotal(); ?>;
order.currency = 'EURO';
<?php $counter = 0;
		$items = $order->get_items();
		foreach ($items as $key => $product) {
			$counter++; ?>
order.sku<?php echo $counter; ?> = '<?php echo $product['sku']; ?>';
order.name<?php echo $counter; ?> = '<?php echo $product['title']; ?>';
order.unitprice<?php echo $counter; ?> = <?php echo $product['price']; ?>;
order.qty<?php echo $counter; ?> = <?php echo $product['quantity']; ?>;
<?php } ?>
</script>

<?php } ?>

At $order->get_subtotal( $item ); I only removed the $item, because we want to get the total without VAT and coupons.

It’s still wrong.

I’ll give you this last hint to get you going, but if you need further assistance with customisation please use jobs.wordpress.net.

foreach ($items as $key => $item) {
  $product = $item['data'];
.....

$product will now be an object, so you can use functions like $product->get_sku(); for product properties.

Some will still be inside $item e.g. the quantity is $item['qty']

If you use:

var_dump($item);

You will be able to see all properties inside which are available to you.

For the cost, use:

$order->get_item_total( $item );

https://docs.woothemes.com/wc-apidocs/class-WC_Product.html

Thank you, now Title, Price and Quantity are working ??

Only the SKU isn’t working, because with $product->get_sku(); I only get the error:

Call to a member function get_sku() on null

Paste your new code?