title: usort sorting multiple fields
body: <p>Is it possible to use <code>usort</code> to sort multiple fields in a multidimensional array? For example, I want to sort <code>name</code> alphabetically and then from those records I want to sort them by <code>age</code>. Is this possible using <code>sort</code>?</p>
  
  <pre><code>Array ( 
      [0] =&gt; Array ( 
          [name] =&gt; Jonah 
          [age] =&gt; 27 
      )
      [1] =&gt; Array (
          [name] =&gt; Bianca 
          [age] =&gt; 32 
      )
  )
  </code></pre>