How to print category name in source code

Hi!
I am adding Google Analytics Content Group in my blog.

I added this kind of code in my Genesis blog using Hooks. PHP is allowed so this is not the problem.

<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-XXX', 'auto');

<?php
if (is_single()){
$category = get_the_category();
if ($category && !empty($category[0]->cat_name)){
echo “ga(‘set’, ‘contentGroup1', ‘”.$category[0]->cat_name.”‘);” \n";
}
}
?>
  ga('send', 'pageview');
</script>

This should print this kind of code in source code.

<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-XXX', 'auto');

ga('set', 'contentGroup1', 'Category's name');
ga('send', 'pageview');
</script>

But id doesn’t work. If I have this php code with analytics code, then it doesn’t print whole analytics code. If I take php away, then rest of the code works well. I should have some basic problem in my PHP but what the problem is?