B6:命令模式 Command

abstract class  Command
{
    protected $receiver;

    public function __construct(Receiver $receiver)
    {
        $this->receiver = $receiver;
    }

    abstract public  function execute($params);
}

class UserCommand extends Command
{
    public function execute($params)
    {
        return $this->receiver->command($params);
    }
}


interface Receiver
{
    public function command($params);
}

class User implements Receiver
{
    public function command($parms)
    {
        echo ‘写入日志:用户增加成功‘ . $parms;
    }
}


class Invoker
{
    protected $command;

    public function setCommand(Command $command)
    {
        $this->command = $command;
    }

    public function execute($params)
    {
        return $this->command->execute($params);
    }
}

$receiver = new User();

$invoker = new Invoker();
$invoker->setCommand(new UserCommand($receiver));
$invoker->execute(‘jack‘);