title: How to add '@' symbol if it doesn't exist in the field?
body: <p>I'm outputting a custom user field in Wordpress, which is user's Twitter username. Some users might add it with '@' symbol, some might without. How can I output that field and check if the symbol already exists, if not, add it?</p>
  
  <p>This is code I'm using to output usrename:</p>
  
  <pre><code>&lt;?php echo get_the_author_meta('twitter_name'); ?&gt;
  </code></pre>