PHP user

<?php
class User{

    public $id;
    public $username;
    public $email;

    private $password;

    public  $loggedin = false;
    //whatever you require for a login here.

    public function __construct($username,$password){
        $sql = new SimpelSQL(); //plugin I wrote and use to make SQL more simple and faster, otherwise to much code... :)
        $this->username = $username;
        $this->password = $password;
        $this->id = $sql->select("id","users",array("username" => $this->username));
        $this->email = $sql->select("email","users",array("username" => $this->username));
    }

    public function login(){
        $oldpassword = $sql->select("password","users",array("id" => $this->id));
        if(password_verify($this->password,$oldpassword)){
            $this->setSession();
            $this->loggedin = true;
        }
        return $this->loggedin;
    }

    public function create($username,$email,$password){
        if($sql->exists("users",array("username" => $username))){
            $sql->insert("users",array(
                0,
                $username,
                $email,
                $password
                ));
            return true;
        }
        return false;
    }

    public function setSession(){
        $_SESSION["id"] = $this->id;
        $_SESSION["username"] = $this->username;
        return $_SESSION;
    }

    public function isLoggedIn(){
        return $this->loggedin;
    }

    public function verify_user(){
        if($sql->exists("users",array("username" => $this->username))){
            return true;
        }
        return false;
    }

    public function setPassword($password){
        $this->password = $password;
        return $this;
    }
    public function getPassword($password){
        return $this->password;
    }
}
?>