title: Build a variable name in PHP out of two variables
body: <p>Depending on the current page, I would like to change the css of the chosen menu module and make others different, etc. All that while building dynamically the page before loading.</p>
  
  <p>My problem is that I have a serie of variables going by this structure :</p>
  
  <pre><code>$css_(NAME_OF_MODULE)
  </code></pre>
  
  <p>To know what variable must be set , I have another variable I received in parameters of this functions, called</p>
  
  <pre><code>$chosen_menu
  </code></pre>
  
  <p>Say <code>$chosen_Menu = "C1"</code>, I would like to add content to <code>$css_C1</code>. Thus, what I want is to create a variable name out of 2 variables, named <code>$css_C1</code></p>
  
  <p>I have tried :</p>
  
  <pre><code>${$css_.$chosen_menu} = "value";
  </code></pre>
  
  <p>But it doesnt seem to work. Any clue ?</p>