title: PHP Splitting an Array into two arrays - keys array and values array
body: <p>Is there an easy way to split an array into two arrays, one consisting of all the keys and the other  consisting of all the values? This would be a reverse to the action of array_combine. Is there an inbuilt function for doing such a task? 
  Let's use an example array: </p>
  
  <pre><code>$array = array('Tiger' =&gt; 'Forest', 'Hippo' =&gt; 'River', 'Bird' =&gt; 'Sky');
  </code></pre>
  
  <p>Is there a function that will split the above array into:</p>
  
  <pre><code>$array_keys = array('Tiger', 'Hippo', 'Bird');
  $array_values = array('Forest', 'River', 'Sky');
  </code></pre>