title: Closing shortcode in WordPress
body: <p>I made a simple WordPress plugin which highlights text.</p>
  
  <pre><code>add_shortcode('close-span', 'highlighter_closing_span_shortcode');
  function highlighter_closing_span_shortcode($atts) {
      return '&lt;/span&gt;';
  }
  </code></pre>
  
  <p>It's the closing shortcode part of the plugin. In this case, users must type "[close-span]". I want to change it to "[/span]". How can I modify the code above?</p>