code snippet

public function loggingIn(){
    if(!empty($this->m_sUsername) && !empty($this->m_sPassword)){
        $PDO = Db::getInstance();
        $stmt = $PDO->prepare("SELECT * FROM users WHERE username = :username");
        $stmt->bindValue(":username", $this->m_sUsername, PDO::PARAM_STR);
        $stmt->execute();

        if($stmt->rowCount() > 0){
            $result = $stmt->fetch(PDO::FETCH_ASSOC);
            $password = $this->m_sPassword;
            $hash = $result['password'];

            if(password_verify($password, $hash)){
                session_start();
                $_SESSION["loggedIn"] = $result['usersid'];
                session_write_close();
                return true;
            }else{
                return false;
            }
        }
    }
}