// 工厂模式interface Iuser{    public function getUserName();}class UserFactory{    static public function load($className)    {        return new strtolower($className);    }    static public function create($className)    {        return new strtolower($className);    }}class User implements Iuser{    public function getUserName()    {        return 'jack';    }}UserFactory::create('User')->getUserName();// 单例模式class Singleton{    static public function getInstance()    {        static $obj = null;        if($obj == null) {            return new Singleton();        }        return $obj;    }    public function getUserName()    {        return 'jack';    }}Singleton::getInstance()->getUserName();// 观察者模式interface Observe{    public function getUserName();}class User{    private $servs = [];    public function register($obj)    {        array_push($servs, $obj);        return $this;    }    public function triggle()    {        if($this->servs) {            foreach($this->servs as $key => $value) {                $value->getUserName();            }        }    }}Class MyUser extends User implements Observ{    public function getUserName()    {        return 'jack';    }}(new User())->register(new MyUser)->triggle();

// 策略模式interface Human{    function speak();}class Chinese implements Human{        public function speak()    {        echo '中国人说中文';    }}class American implements Human{        public function speak()    {        echo '美国人说英文';    }}