How will my client use the website while it is locally hosted on my pc?

I am making a simple website that only consists of a login and register page.. now my question is the back-end side of things as phpmadmin or mysql database.. how the website going to function on the client side while it is locally hosted on my PC? how can i do this task?

now i am done with front-end side of things can i use something other than php my admin or mysql so it can function from any computer?

here is the template i tried using...

    <?php
/* Database credentials. Assuming you are running MySQL
server with default setting (user 'root' with no password) */
define('DB_SERVER', 'localhost');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_NAME', 'demo');
 
/* Attempt to connect to MySQL database */
$link = mysqli_connect(DB_SERVER, DB_USERNAME, DB_PASSWORD, DB_NAME);
 
// Check connection
if($link === false){
    die("ERROR: Could not connect. " . mysqli_connect_error());
}
?>

if anyone has any recommendations/solutions please let me know. Maybe there are other solutions other than (mysql).

source https://stackoverflow.com/questions/71607003/how-will-my-client-use-the-website-while-it-is-locally-hosted-on-my-pc