title: How to split and count the words with single quotes (')?
body: <p>I want to split word like <strong>who's</strong> and count it into 2 words:</p>
  <p>who = 1</p>
  <p>s = 1</p>
  <p>I think it will use preg_split to do this job, but I don't understand how to do it.</p>