title: Getting to the next key in an array
body: <p>Let's assume I know that there is key "twoVal", but I do not know what is after it. How do I get to the next key for that matter? Shoud I know the position of key "twoVal"? Or there is another way around? </p>
  
  <pre><code>$arr = array('Cool Viski' =&gt; array('oneVal' =&gt; '169304',
                                     'twoVal' =&gt; '166678',
                                     'threeVal' =&gt; '45134'));
  </code></pre>