tracking_code.php

<?php
/**
 * Insert Google Analytics (GA) tracking code in Javascript
 * in the .
 *
 * Anything echoed by this function will be written in the
 * head of all pages.
 *
 * Created by Guido W. Pettinari on 23.12.2015.
 * Part of WordPress Analytics:
 * https://github.com/coccoinomane/wordpress_analytics
 */
function wpan_tracking_code() {

	// Extract the tracking UID from the database
	$options                   = wpan_get_options();
	$tracking_uid              = isset( $options ['tracking_uid'] ) ? $options ['tracking_uid'] : '';
	$create_tracker            = isset( $options ['create_tracker'] ) ? $options ['create_tracker'] : '';
	$send_page_view            = isset( $options ['send_page_view'] ) ? $options ['send_page_view'] : '';
	$ga_tracker                = isset( $options ['tracker_name'] ) ? $options ['tracker_name'] : '';
	$content_grouping          = is_single() && isset( $options ['content_grouping'] ) && $options ['content_grouping'];
	$scroll_tracking           = is_single() && isset( $options ['scroll_tracking'] ) && $options ['scroll_tracking'];
	$call_tracking             = isset( $options ['call_tracking'] ) && $options ['call_tracking'];
	$email_tracking            = isset( $options ['email_tracking'] ) && $options ['email_tracking'];
	$custom_code               = isset( $options ['custom_code'] ) && $options ['custom_code'];
	$enhanced_link_attribution = isset( $options['enhanced_link_attribution'] ) && $options['enhanced_link_attribution'];
	$cross_domain_support      = isset( $options['cross_domain_support'] ) && $options['cross_domain_support'];

	echo PHP_EOL . PHP_EOL . '<!-- BEGIN: Tracking code inserted by WordPress Analytics ' . WPAN_VERSION . ' - ' . WPAN_URL . '-->' . PHP_EOL; // phpcs:ignore

	if ( ! $tracking_uid ) { // Execute the script only if the tracking ID exists
		echo '<!-- Error: empty tracking uid -->';
	} elseif ( ! $ga_tracker ) { // Execute the script only if the tracker name exists
		echo '<!-- Error: empty tracker name -->';
	} else {

		// Load the analytics.js library & create the tracker
		if ( $create_tracker ) {
			?>

<script>
	(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
	(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
	m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
	})(window,document,'script','//www.google-analytics.com/analytics.js',<?php echo( "'$ga_tracker'" ); ?>);
	// Pass the tracking UID of the GA property associated to this website
			<?php
			if ( ! $cross_domain_support ) {
				echo "$ga_tracker('create', '" . $tracking_uid . "', 'auto');\n";
			} else {
				// Alas, the allowLinker field can be passed only within a create command
				// (https://developers.google.com/analytics/devguides/collection/analyticsjs/
				// field-reference#allowLinker)
				echo "$ga_tracker('create', '" . $tracking_uid . "', 'auto', {'allowLinker': true});\n";
			}
			?>
</script>

			<?php

		}

		// Scroll tracking script to track reading behaviour
		if ( $scroll_tracking ) {
			wpan_scroll_tracking();
		}

		// Call tracking script to track clicks on phone number links
		if ( $call_tracking ) {
			wpan_call_tracking();
		}

		// Email tracking script to track clicks on email links
		if ( $email_tracking ) {
			wpan_email_tracking();
		}

		// Content grouping script to categorise the website content in GA
		if ( $content_grouping ) {
			wpan_content_grouping();
		}

		// Enable Cross Domain support
		if ( $cross_domain_support ) {
			echo "<script> $ga_tracker('require', 'linker'); </script>\n";
			echo "<script> $ga_tracker('require', 'displayfeatures'); </script>\n";
		}

		// Enable Enhanced Link attribution
		if ( $enhanced_link_attribution ) {
			echo "<script> $ga_tracker('require', 'linkid'); </script>\n";
		}

		// Execute code specified by the user
		if ( $custom_code ) {
			echo wpan_php_eval( $options ['custom_code'] );
		}

		// Send a pageview hit to the GA servers, and transmit any information
		// that was set above in the tracker. This line should be at the end
		// of the script.
		if ( $send_page_view ) {
			echo "<script> $ga_tracker('send', 'pageview'); </script>\n";
		}
	} // if $tracking_uid

	echo '<!-- END: Tracking code inserted by WordPress Analytics ' . WPAN_VERSION . ' - ' . WPAN_URL . '-->' . PHP_EOL . PHP_EOL;

} // end of function

?>