title: changing the key description in php array issue
body: <p>I have an array like the one below</p>
  
  <pre><code>Array
  (
      [0] =&gt; Array
          (
              [name] =&gt; Alex
              [age] =&gt; 30
              [place] =&gt; Texas                
          )
  
      [1] =&gt; Array
          (
              [name] =&gt; Larry
              [age] =&gt; 28
              [place] =&gt; Memphis
  
          )
  
  )
  </code></pre>
  
  <p>How would I change the key names? Like "name" to "firstname", "age" to "years", "place" to "address"?</p>