title: mysqli object variable from request key
body: <p>Im not sure if this is possible. here is what i have</p>
  
  <pre><code>if ($_REQUEST[db]=="abcd"){   
      $result =$abcdsqli-&gt;query("SELECT * FROM ...");
  }elseif ($_REQUEST[db]=="efgh"){   
      $result =$efghsqli-&gt; ...
  }
  </code></pre>
  
  <p>here is what i want</p>
  
  <pre><code>$result =$.$_REQUEST[db].sqli-&gt;query("SELECT * FROM ...");
  </code></pre>