php 设计模式

1: php 工厂设计模式

      ';            return new $type;        }        else        {    echo 'driver not found';            throw new Exception('Driver not found');        }    }}//使用工厂$a = Factory::fac('A');$a->method();$b = Factory::fac('B');$b->method();?>

 

2：php 单例设计模式

      ';        echo 'please do not create by yourself!
';    }        //单例方法    public static function singleton()    {        if(!isset(self::$instance))        {            $theClass = __CLASS__;            self::$instance = new $theClass;        }                return self::$instance;    }    //单例中的普通方法    public function hello()    {        echo 'hello everyone! I am singleton  
';    }    //阻止用户复制对象实例    public function __clone()    {        trigger_error('do not clone the singleton.',E_USER_ERROR);    }}//$test = new Single();    //错误调用//单例的正确使用方式；$sing = Single::singleton();$sing-> hello();//clone测试//$test = clone $sing;    //会收到，上面的 clone错误；?>

 

3：json 数据处理

      'jkk','age'=>22,'sex'=>'man','phone'=>1321058559);    echo json_encode($arr);?>

 

4：数据库连接设计 

      server = $server;        $this->user_name = $user_name;        $this->password = $password;        $this->db = $db;                $this->connect();    }        private function connect()    {        //这里面初始为 $this->link 为 数据库连接；        echo "
      
";        echo $this->server.'
';        echo $this->user_name.'
';        echo $this->password.'
';        echo $this->db.'
';    }    }$con = new Connection('ubuntuServer14','test','test','db');?>