title: Keyword analysis in PHP
body: <p>For a web application I'm building I need to analyze a website, retrieve and rank it's most important keywords and display those.</p>
  
  <p>Getting all words, their density and displaying those is relatively simple, but this gives very skewed results (e.g. stopwords ranking very high).</p>
  
  <p>Basically, my question is: How can I create a keyword analysis tool in PHP which results in a list correctly ordered by word importance?</p>