title: How to decode a json string with getting the first item?
body: <p>I have some string like this <code>$string = {"71":"message1","72":"message2" }</code>
  The 71 and 72 are the id's</p>
  
  <p>I want to select these ide's from <strong>$string</strong> and pass them to some function like this:</p>
  
  <pre><code>$id = array('71','72')
      $collection = Mage::getModel('model/model')-&gt;load($id);
  </code></pre>
  
  <p>How can I parse the string and get the id of each one of them.</p>