oop.php

<?php

// Classes vs Objects

class User{

	private $email;
	private $password;

	const MINCHARS = 8;

	public function login(){
		return "Logging in";
	}

	public function logout(){
		return "Logging out";
	}

	public function setEmail($e){
		if(filter_var($this->email, FILTER_VALIDATE_EMAIL) ){
			throw new Exception("A none valid email was provided");
		}
		
		$this->email = $e;
	}

	public function getEmail(){
		return $this->email;
	}

	public function setPassword($p){
		if(!$this->validatePassword($p)){
			throw new Exception('The password should be '.self::MINCHARS.' chars long');
		}

		$this->password = hash('sha256', $p);
	}

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

	private function validatePassword($p){
		return strlen($p) < self::MINCHARS ? false : true;
	}

}

$user = new User();
$user->setEmail("[email protected]");
$user->setPassword('helloworld');

echo $user->login();
echo $user->logout();
echo $user->getPassword();

var_dump($user);