How do I implement Google Analytics userID feature in Joomla 2.5 for logged in users with PHP?

Question

My Joomla template includes the analyticstracking.php file with the tracking script, which has worked great, however I'd like to implement Google Analytic's userID feature (for cross-device tracking) for logged in users. Here's the original, working analyticstracking.php file (essentially just the basic analytics script):

<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','ga');
  ga('create', 'UA-XXXXXXXX-X', 'auto');
  ga('require', 'linkid', 'linkid.js');
  ga('require', 'displayfeatures');
  ga('send', 'pageview');
</script>

After doing some research, I came up with the following php script to try to generate the userID from Joomla's built-in $user->id, if the user is logged in:

<?php 
   $user = JFactory::getUser();
   if ($isset($user->id)) {
    $gacode = "ga('set', 'userID', '%s');";
    echo sprintf($gacode, $user->id);
?>

I tried just inserting that into the javascript, but that crashed my site. So I don't know whether my php is wrong, or if I can't add it to the script in that way, or something else entirely? Please help!

Answer 1

oooooo and Terry Carter both mentioned errors in your code. Besides fixing those it would be good to modify your question to show exactly what your final analyticstracking.php file looks like. Something like this:

<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','ga');
  ga('create', 'UA-XXXXXXXX-X', 'auto');
  ga('require', 'linkid', 'linkid.js');
  ga('require', 'displayfeatures');
  ga('send', 'pageview');

  <?php 
  $user = JFactory::getUser();
  if ( !$user->isGuest && is_numeric($user->id) )
  {
    echo sprintf("ga('set', 'userId', '%d');", $user->id);
  }
  ?>    
</script>

That code has my suggested corrections so you can give it a try.

Answer 2

Your $isset line is probably where your issue lies; that is a variable declaration which is wrong.

You may want to do this: is_set ($user->id)

It isn't a great approach either.

Use the isGuest method to return a boolean as to whether or not the user is logged into the site like so:

$user  = JFactory::getUser();
$guest = $user->isGuest;

if (!$guest){
    $gacode = "foo";
}

To add this to your script try the following:

if(!$guest){
    $gacode = "<script type='text/javascript'>_gaq.push(['_setCustomVar','User ID','".$user->id."',3]);</script>";
    echo $gacode;
}

This code should be added after your analytics javascript. If the user is logged in it will then asynchronously push the user id to google analytics using the custom variable line. To read more about custom google analytics variables please see this article.