php魔术方法有哪些

php魔术方法：

_sleep() 可以控制对象序列化时真正处理的部分

_wakeup() 在反序列化后还原对象属性

_toString() 对象转换成为字符串的机制

把php变量转换成一串编码后字符串，方法为serialize() 反序列化unserialize()

  //序列化
  class testSerialize{
   public $a = 10;
   public $b = 15;
   public $c = 20;
   function _construct(){
   $this->b = $this->a * 10;
   $this->c = $this->b * 2;
   } 
  }
$k = serialize(new testSerialize());
echo $k;//
out:  O:13:"testSerialize":3:{s:1:"a";i:10;s:1:"b";i:15;s:1:"c";i:20;}
$j = unserialize($k);

sleep方法：

class testSerialize1{
   public $a = 10;
   public $b = 15;
   public $c = 20;
   function _construct(){
   $this->b = $this->a * 10;
   $this->c = $this->b * 2;
   } 
   function __sleep(){
   return $this->a;
   }
  }
$k = serialize(new testSerialize1());
echo $k;

其他方法同理