Server Side Google Analytics (SSGA) is a simple PHP 5 class, which allows to track server-side events and data within Google Analytics.
Drop-in solution for WordPress plugins (uses the WP HTTP API if available).
Google Analytics Server Side can be used simply in the following manner:
Easy:
ssga_track( 'UA-YOUR_NUMBER', 'yoursite.com', '/page.php' )
Advanced:
//create new ssga object
include 'lib/ss-ga.class.php';
$ssga = new ssga( 'UA-YOUR_NUMBER', 'yoursite.com' );
//Set a pageview
$ssga->set_page( '/page.php' );
$ssga->set_page_title( 'Page Title' );
// Send
$ssga->send();
$ssga->reset();
Set an event (based on http://code.google.com/apis/analytics/docs/tracking/eventTrackerGuide.html)
//$ssga as created above
$ssga->set_event( 'Feed', 'Categories', $label, $value );
$ssga->send();
Ecommerce tracking (update and test by @nczz)
$ssga_step1 = new ssga( 'UA-12345678-1','domain.tw' );
//$transaction_id, $affiliation, $total, $tax, $shipping, $city, $region, $country
$ssga_step1->send_transaction("20159527001", "MXP", 280, 0, 80,"Taiwan", "", "TW");
$ssga_step2 = new ssga( 'UA-12345678-1','domain.tw' );
//$transaction_id, $sku, $product_name, $variation, $unit_price, $quantity
$ssga_step2->send_item("20159527001", "1229001", "TEST-PRODUCT", "", 50, 4);