title: PHP sort an array of array
body: <p>I have the folloring array structure:</p>
  
  <pre><code>$list = array();
  $element1 = array('start' =&gt; '10', 'end' =&gt; '15');
  $element2 = array('start' =&gt; '1',  'end' =&gt; '5');
  $list[] = $element1;
  $list[] = $element2;
  </code></pre>
  
  <p>Every element in <code>start</code> and <code>end</code> are numeric only.</p>
  
  <p>I would like to sort <code>$list</code> by <code>start</code> values. How can I do that effectivly?</p>