title: How set requirements for text input field (html/php) ?
body: <p>In my php script i have this input field.</p>
  
  <pre><code>   &lt;input type="text" name="try" size="10" id="try" maxlength="5" &gt;
  </code></pre>
  
  <p>What is the easy way to make i require 5 characters and show an error message if they are not only letters. </p>