title: How to return a file in PHP
body: <p>I have a file</p>
  
  <pre><code>/file.zip
  </code></pre>
  
  <p>A user comes to</p>
  
  <pre><code>/download.php
  </code></pre>
  
  <p>I want the user's browser to start downloading the file. How do i do that? Does readfile open the file on server, which seems like an unnecessary thing to do. Is there a way to return the file without opening it on the server?</p>