site_url() with HTTPS prefix - codeigniter

Question

*UPDATE
When I use site_url() it returns http://mysite.com
Is there a function or an option to get this to return the site URL with HTTPS ?
Example
So site_url( array('use_https' => 'on') ) to get https:mysite.com

Answer 1

Not specifically. But you could write your own function or just use:
https://<?php echo $_SERVER['SERVER_NAME']; ?>
or
function url_https($base_url)
{
return str_replace('http://', 'https://', $base_url);
}

Answer 2

2022 Answer
This question is old but still ranks high in the Google results.
This function accepts parameters:
https://developer.wordpress.org/reference/functions/site_url/
The second parameter sets the scheme. So you can use it as following:
site_url('/', 'https');

Answer 3

1 Hack is to change the codeignite definition of the base url to just // ... // will use what ever protocol is in use right now.
if you use https://example.com your links will use https if you use http://example.com your links will use http
/* Location: ./system/core/Config.php */
if (isset($_SERVER['HTTP_HOST']) && preg_match('/^((\[[0-9a-f:]+\])|(\d{1,3}(\.\d{1,3}){3})|[a-z0-9\-\.]+)(:\d+)?$/i', $_SERVER['HTTP_HOST']))
{
$base_url = /*(is_https() ? 'https' : 'http').'://'.*/"//".
$_SERVER['HTTP_HOST'].substr($_SERVER['SCRIPT_NAME'], 0, strpos($_SERVER['SCRIPT_NAME'], basename($_SERVER['SCRIPT_FILENAME'])));
}
else
{
$base_url = 'http://localhost/';
}