title: PHP rename array keys in multidimensional array
body: <p>In an array such as the one below, how could I rename "fee_id" to "id"?</p>
  
  <pre><code>Array
  (
      [0] =&gt; Array
          (
              [fee_id] =&gt; 15
              [fee_amount] =&gt; 308.5
              [year] =&gt; 2009                
          )
  
      [1] =&gt; Array
          (
              [fee_id] =&gt; 14
              [fee_amount] =&gt; 308.5
              [year] =&gt; 2009
  
          )
  
  )
  </code></pre>