How to implement a check for something via http or https if a person has a website open?

Question

PHP

Good morning!
I had a question how to use php to check through which protocol the site is open on the client and display the message "https available" exactly the message if it is via http and not any forced redirects to https

Answer 1

The variable $_SERVER['HTTPS']takes a non-empty value if the request was made via the HTTPS protocol.
Note: Note that when using ISAPI with IIS, the value will be off if the request was not made over HTTPS.

www.php.net/reserved.variables.server
Hence:

if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') { 
// HTTPS
}