How to check if post field is from 8 - 20 characters long
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/2492926/php-strlen-question">PHP strlen question</a>  </p>
</blockquote>



<p>how to check if text from post field is 8 - 20 characters long? Is it done with strlen, and could you give me some example, please?</p>
