How to register?

Question

PHP

They hired me to work, they didn’t explain anything, they said do it! Only I don't know how to do it, the person who is supposed to help doesn't give a damn. Maybe you can help. I don't know what information to give. Write if you need anything.

if ($action == "register") {
$user_login = strtolower($_POST['username']);
if (!$user_login) $user_login = strtolower($_GET['username']);
$user_email = strtolower($_POST['useremail']);
if (!$user_email) $user_email = strtolower($_GET['useremail']);
$user_password = strtolower($_POST['userpassword']);
if (!$user_password) $user_password = strtolower($_GET['userpassword']);

echo GetRegisterUser($user_login,$user_email,$user_password);
exit();
}

Answer 1

What have you read in PHP? any PHP book in general gives often good examples with Guestbook, site registration, etc. so about 8 years ago I also dreamed of writing a chat in one line
chat_run();