title: Setting "charset" on the back end vs. the front end
body: <p>I can set "charset" on the back end (PHP):</p>
  
  <pre><code>header('charset=utf-8');
  </code></pre>
  
  <p>I can also set it on the front end (HTML):</p>
  
  <pre><code>&lt;meta charset="UTF-8"&gt;
  </code></pre>
  
  <p>Where should I set it and why?</p>