title: php - display links to related content
body: <p>I am looking to implement a 'youtube related videos' style related content system.</p>
  
  <p>I have 5 tags/keywords for each of my pages, a title and a description. I would like to display links to the two most similar pages.</p>
  
  <p>I am guessing a mysql query based around order by relevance.</p>
  
  <p>many thanks.</p>