PHP: Force SSL

ssl.php

<?php
if (!isset($_SERVER['HTTPS']) || $_SERVER['HTTPS'] !== 'on') {
  if(!headers_sent()) {
    header("Status: 301 Moved Permanently");
      header(sprintf(
        'Location: https://%s%s',
        $_SERVER['HTTP_HOST'],
        $_SERVER['REQUEST_URI']
      ));
    exit();
  }
}
?>