How to redirect to a secure connection

Index	Description
HTTPS	Returns a non-empty value if the current request is using HTTPS.
HTTP_HOST	Returns the host for the current request.
REQUEST_URI	Returns the URI (Uniform Resource Identifier) for the current request.

      <?php
      // make sure the page uses a secure connection 
      $https = filter_input(INPUT_SERVER, 'HTTPS'); 
      if (!$https) { 
        $host = filter_input(INPUT_SERVER, 'HTTP_HOST'); 
        $uri = filter_input(INPUT_SERVER, 'REQUEST_URI');
        $url = 'https://' . $host . $uri; header("Location: " . $url); 
        exit(); 
      } 
      ?>
      

Description

• The $_SERVER array contains information about headers and paths. This data is set by your web server, and the code above works for most versions of Apache.
• Unfortunately, all web servers don’t set the values in the $_SERVER array the same way. So, if this code doesn’t work for your web server, you need to adjust it so it does.
• You can use the filter_input() function to get the values for the indexes of the $_SERVER array.