title: Create variable accessible through all templates in PrestaShop
body: <p>I understood that if I want to make my own template variable in PrestaShop, I would use code like this:</p>
  
  <pre><code>$this-&gt;context-&gt;smarty-&gt;assign( 'varName', 'varValue' );
  </code></pre>
  
  <p>I also understood that the right way to add this is putting it into a controller... and it all works...</p>
  
  <p>What I can't figure out is how to do this in one place but still being able to access the template variable in ALL templates (my theme's .tpl files)?</p>
  
  <p>PS: Adding it to all controllers seems redundant... I tried to google it out, but I guess I am putting bad keywords to search for... </p>