title: Next key in array
body: <p>I have an array:</p>
  
  <pre><code>$array=array(
      "sdf"=&gt;500,
      "gsda"=&gt;1000,
      "bsdf"=&gt;1500,
      "bads"=&gt;2000,
      "iurt"=&gt;2500,
      "poli"=&gt;3000
  );
  </code></pre>
  
  <p>How can I get the name of the next key? For example if the current array is <code>gsda</code>, I need <code>bsdf</code>.</p>