gistfile1.txt

<?php
/*
 * Adding actual Google Analytics
 */
add_action( 'amp_post_template_footer', 'xyz_amp_add_analytics' );

function xyz_amp_add_analytics() {
    ?>
    <amp-analytics type="googleanalytics" id="analytics1">
        <script type="application/json">
		{
			"vars": {
				"account": "UA-xxxxxxxx-x" /*insert your GA tracking id*/
			},
			"triggers": {
				"trackPageviewWithAmpdocUrl": {
					"on": "visible",
					"request": "pageview"
				}
			}
		}
        </script>
    </amp-analytics>
   <?php
}
?>