title: Mod Rewrite, pass parameters from URL1 to URL2
body: <p>I'm trying to rewrite the following URL</p>
  
  <pre><code>test.php?par1=foo&amp;par2=bar
  </code></pre>
  
  <p>Into...</p>
  
  <pre><code>newtest.php?hidden_par=blah&amp;par1=foo&amp;par2=bar
  </code></pre>
  
  <p>I have this rule, that does not work:</p>
  
  <pre><code>RewriteRule ^test.php\??(.*?)$ newtest.php?hiden_par=blah&amp;$1 [L]
  </code></pre>
  
  <p>Could this be done using RewriteCond or something else? (say, could this be done ?), thanks in advance.</p>