title: PHP a concatenate variable issue
body: <p>I'm trying to concatenate several variables following <a href="http://php.net/manual/en/language.variables.variable.php" rel="nofollow">http://php.net/manual/en/language.variables.variable.php</a> but I don't get why it's not working</p>
  
  <pre><code>&lt;?PHP
  
  $test1 = 'test1';
  $test2 = 'test2';
  $test0 = 'test0';
  
  for($i=1;$i&lt;=9;$i++){
      $j = $i%3;
      echo ${$test.$j};
  }
  
  ?&gt;
  </code></pre>