abstract class SocialNetworkPoster
{
    abstract public function getSocialNetwork(): SocialNetworkConnector;

    public function post($content): void
    {
        // Call the factory method to create a Product object...
        $network = $this->getSocialNetwork();
        // ...then use it as you will.
        $network->logIn();
        $network->createPost($content);
        $network->logout();
    }
}


class FacebookPoster extends SocialNetworkPoster
{
    private $login, $password;

    public function __construct(string $login, string $password)
    {
        $this->login = $login;
        $this->password = $password;
    }

    public function getSocialNetwork(): SocialNetworkConnector
    {
        return new FacebookConnector($this->login, $this->password);
    }
}


class LinkedInPoster extends SocialNetworkPoster
{
    private $email, $password;

    public function __construct(string $email, string $password)
    {
        $this->email = $email;
        $this->password = $password;
    }

    public function getSocialNetwork(): SocialNetworkConnector
    {
        return new LinkedInConnector($this->email, $this->password);
    }
}

interface SocialNetworkConnector
{
    public function logIn(): void;

    public function logOut(): void;

    public function createPost($content): void;
}

class FacebookConnector implements SocialNetworkConnector
{
    private $login, $password;

    public function __construct(string $login, string $password)
    {
        $this->login = $login;
        $this->password = $password;
    }

    public function logIn(): void
    {
        echo "Send HTTP API request to log in user $this->login with " .
            "password $this->password\n";
    }

    public function logOut(): void
    {
        echo "Send HTTP API request to log out user $this->login\n";
    }

    public function createPost($content): void
    {
        echo "Send HTTP API requests to create a post in Facebook timeline.\n";
    }
}

class LinkedInConnector implements SocialNetworkConnector
{
    private $email, $password;

    public function __construct(string $email, string $password)
    {
        $this->email = $email;
        $this->password = $password;
    }

    public function logIn(): void
    {
        echo "Send HTTP API request to log in user $this->email with " .
            "password $this->password\n";
    }

    public function logOut(): void
    {
        echo "Send HTTP API request to log out user $this->email\n";
    }

    public function createPost($content): void
    {
        echo "Send HTTP API requests to create a post in LinkedIn timeline.\n";
    }
}

function clientCode(SocialNetworkPoster $creator)
{
    // ...
    $creator->post("Hello world!");
    $creator->post("I had a large hamburger this morning!");
    // ...
}

echo "Testing ConcreteCreator1:\n";
clientCode(new FacebookPoster("john_smith", "******"));
echo "\n\n";

echo "Testing ConcreteCreator2:\n";
clientCode(new LinkedInPoster("john_smith@example.com", "******"));