title: php: how to get associative array key from numeric index?
body: <p>If I have:</p>
  
  <pre><code>$array = array( 'one' =&gt;'value', 'two' =&gt; 'value2' );
  </code></pre>
  
  <p>how do I get the string <code>one</code> back from <code>$array[1]</code> ?</p>