Google Page Speed tracking

pagespeed_detect.php

function gaParseCookie() {
	if (isset($_COOKIE['_ga'])) {
		list($version,$domainDepth, $cid1, $cid2) = explode('.', $_COOKIE["_ga"], 4);
		$contents = array('version' => $version, 'domainDepth' => $domainDepth, 'cid' => $cid1 . '.' . $cid2);
		$cid = $contents['cid'];
	} else {
		$cid = gaGenerateUUID();
	}
	return $cid;
}

function gaGenerateUUID() {
	return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
		mt_rand(0, 0xffff), mt_rand(0, 0xffff), //32 bits for "time_low"
		mt_rand(0, 0xffff), //16 bits for "time_mid"
		mt_rand(0, 0x0fff) | 0x4000, //16 bits for "time_hi_and_version", Four most significant bits holds version number 4
		mt_rand(0, 0x3fff) | 0x8000, //16 bits, 8 bits for "clk_seq_hi_res", 8 bits for "clk_seq_low", Two most significant bits holds zero and one for variant DCE1.1
		mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff) //48 bits for "node"
	);
}

function gaSendData($data) {
	$getString = 'https://ssl.google-analytics.com/collect';
	$getString .= '?payload_data&';
	$getString .= http_build_query($data);
	$result = wp_remote_get($getString);
	return $result;
}


if ( strpos($_SERVER['HTTP_USER_AGENT'], 'Google Page Speed') !== false ) {
	$protocol = stripos($_SERVER['SERVER_PROTOCOL'], 'https') === true ? 'https://' : 'http://';
	$currentURL = $protocol . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

	if ( strpos($currentURL, ".js") !== false ) {
		exit();
	} else {
		global $post;
		$currentTitle = get_the_title($post->ID); //This example uses WordPress to get the page title
	}

	$data = array(
		'v' => 1,
		'tid' => UA-0000000-1, //Add your Google Analytics account number here!
		'cid' => gaParseCookie(),
		't' => 'event',
		'ec' => 'Google Page Speed', //Category
		'ea' => $currentURL, //Action
		'el' => $currentTitle //Label
	);
	gaSendData($data);
}