Login with Github account via PHP & Mysqli

If you don't have Github OAuth ClientID, just go here to generate yours: https://github.com/settings/applications/new

Then enter the ClientID & ClientSecret here, and also set your Authorization callback URL:

$clientID = 'Your_Github_OAuth_ClientID';
$clientSecret = 'Your_Github_OAuth_ClientSecret';
$redirectURL = 'Your_Github_Auth_CallbackURL';