title: Fastest serialize data format form PHP reading
body: <p>I have a PHP frontend and a C++ backend, and I need to be able to send groups of names to the frontend. What serialized format would be the most efficient/fastest for the PHP to read? </p>
  
  <p>Example data</p>
  
  <pre><code>group1:
    name1 3923
    name2 9879
    name3 8944
  group2:
    name5 9823
  group3: 
    name9 9822
    name1 4894
  </code></pre>
  
  <p>What would be the fastest for PHP to read?</p>
  
  <ul>
  <li>XML</li>
  <li>JSON</li>
  <li>YAML</li>
  <li>Protocol Buffer</li>
  <li>Comma/Space Delimited our own system</li>
  <li>Anything else? other?</li>
  </ul>