title: How to Implement A Recommendation System?
body: <p>I've Collective Intelligence book, but I'm not sure how it can be apply in practical.</p>
  
  <p>Let say I have a PHP website with mySQL database. User can insert articles with title and content in the database. For the sake of simplicity, we just compare the title.</p>
  
  <ul>
  <li><strong>How to</strong> Make <strong>Coffee</strong>?</li>
  <li>15 Things About <strong>Coffee</strong>.</li>
  <li>The Big Question.</li>
  <li><strong>How to</strong> Sharpen A Pencil?</li>
  <li>Guy Getting Hit in Balls</li>
  </ul>
  
  <p>We open 'How to Make Coffee?' article and because there are similarity in words with the second and fourth title, they will be displayed in Related Article section.</p>
  
  <p>How can I implement this using PHP and mySQL? It's ok if I have to use Python. Thanks in advance.</p>