title: Convert a number to its string representation
body: <p>I'm developing a simple web application where in I need to display number a to my users in string format. </p>
  
  <p>Example:</p>
  
  <pre><code>12 - One Two or Twelve
  -20 - minus Two zero or minus twenty
  </code></pre>
  
  <p>Either way is fine. I need this to be done in PHP. Any help will be appreciated.</p>