Function — Add a backup user for safe recovery from an attack - martindubenet/Wordpress GitHub Wiki

/**
 * Add an hardcoded backup user to recover access to dashboard if hacked.
 */
function wpb_admin_account(){
	$user  = 'YOUR_USERNAME';
	$pass  = 'YOUR_PASSWORD';
	$email = 'YOUR_ACCOUNT@YOUR_DOMAINE.COM';

	if ( !username_exists( $user ) && !email_exists( $email ) ) {
		$user_id = wp_create_user( $user, $pass, $email );
		$user = new WP_User( $user_id );
		$user->set_role( 'administrator' );
	}
}
add_action('init','wpb_admin_account');