User.class.php

<?php
    class User extends BD{
        private $username;
        private $fullname;
        private $email;
        private $password;

        public function setUsername($username){
            $this->username = $username;
        }
        public function setFullname($fullname){
            $this->fullname = $fullname;
        }
        public function setEmail($email){
            $this->email = $email;
        }
        public function setPassword($password){
            $this->password = $password;
        }
        public function getUsername(){
            return $this->username;
        }
        public function getFullname(){
            return $this->fullname;
        }
        public function getEmail(){
            return $this->email;
        }
        public function getPassword(){
            return $this->password;
        }
        public function login(){
            session_start();
            $pdo = parent::conn();

            $dataquery = $pdo->prepare("SELECT id FROM users WHERE username = :username AND password = :password");
            $dataquery->bindParam(":username", $this->getUsername());
            $dataquery->bindParam(":password", $this->getPassword());
            $dataquery->execute();
            if($dataquery->rowCount() > 0){
                $fetch = $dataquery->fetchObject();
                $_SESSION['id_user'] = $fetch->id;
                return true;
            }else{
                return false;
            }
        }
        public function register(){
            $pdo = parent::conn();

            $dataquery = $pdo->prepare("INSERT INTO users(username, email, fullname, password) VALUES(:username,:email,:fullname,:password)");
            $dataquery->bindParam(":username", $this->getUsername());
            $dataquery->bindParam(":email", $this->getEmail());
            $dataquery->bindParam(":fullname", $this->getFullname());
            $dataquery->bindParam(":password", $this->getPassword());
            if($dataquery->execute()){
                return true;
            }else{
                return false;
            }
        }
    }