title: Pentagon Chart in PHP
body: <p>I want to implement a pentagonal shaped chart according to my historical data saved in database in PHP. In fact I want to use it in CakePHP. 
  Need yours help either by providing any chart api link or any library available online.
  Thanks in advance.</p>
  
  <p><img src="https://i.stack.imgur.com/7akyK.jpg" alt="The chart should somehow looks like it"></p>