1.构造函数传参

2.__get和__set实现,当调用不存在的属性的时候,可以取值和赋值到data属性数组

3.__sleep实现,当序列化对象的时候,只序列化data属性数组和类内初始化定义的字段

4.__isset实现,可以判断属性是否存在,通过判断data属性数组

5.toArray方法实现,返回data属性数组

6.记录了构造初始化后,动态添加的属性字段

 

     newFlag = true;        } else {            $this->newFlag = false;            foreach ($data as $k => $v) {                    $this->data[$k] = $v;            }        }    }    public function __isset($name){        return isset($this->data[$name]);    }    public function __get($name){        if(!array_key_exists($name, $this->data)){        	return null;        }        return $this->data[$name];    }    public function __set($name, $value){        $this->data[$name] = $value;        if (!$this->newFlag) {            $this->changes[$name] = $value;        }    }    public function __sleep(){        return array('data');    }    public function toArray(){        return $this->data;    }    public function isNew(){        return $this->newFlag;    }    public function clearNewFlag(){        $this->newFlag = false;    }    public function isModified()    {        return (!empty($this->changes));    }    public function getChanges()    {        return $this->changes;    }    public function clearChanges()    {        $this->changes = array();    }      }class Setting extends Sina_Data_Object{	const STATUS=1;	public $other='aaa';	public function __construct($data=array()){		parent::__construct($data);	}}//初始化对象$data=array('user'=>'taoshihan');$setting=new Setting($data);//动态增加属性$setting->age=100;var_dump($setting);/*object(Setting)#1 (4) {  ["other"]=>  string(3) "aaa"  ["data":protected]=>  array(2) {    ["user"]=>    string(9) "taoshihan"    ["age"]=>    int(100)  }  ["changes":"Sina_Data_Object":private]=>  array(1) {    ["age"]=>    int(100)  }  ["newFlag":"Sina_Data_Object":private]=>  bool(false)}*///动态改变初始化的字段$setting->other='bbbb';//序列化对象$serializeSetting=serialize($setting);//反序列化对象$setting2=unserialize($serializeSetting);var_dump($setting2);/*object(Setting)#2 (4) {  ["other"]=>  string(3) "aaa"   ########反序列化回来这里还是aaa  ["data":protected]=>  array(3) {    ["user"]=>    string(9) "taoshihan"    ["age"]=>    int(100)  }  ["changes":"Sina_Data_Object":private]=>  array(0) {      ##########change属性里面的数据没有序列化进去  }  ["newFlag":"Sina_Data_Object":private]=>  bool(true)      #########反序列化回来这里是true}*/