php 魔术方法 __sleep __wakeup __toString __debuginfo

classtest{public$name='demon';

    private$age='19';

    publicfunction__sleep(){return ['name'];
    }  
}

$test = new test();
echo serialize($test);
//输出结果：O:4:"test":1:{s:4:"name";s:5:"demon";}

classtest{public$name='demon';

    private$age='19';

    publicfunctionsay(){echo"反序列化";
    }

    publicfunction__wakeup(){$this->say();
    }   
}

$test = new test();
unserialize(serialize($test));
//输出结果：反序列化

classtest{public$name='demon';

    private$age='19';

    publicfunction__toString(){return'test';
    } 
}

$test = new test();
echo$test;
//输出结果：test

classtest{public$name='demon';

    private$age='19';

    publicfunction__debuginfo(){return ['name'];
    }

}

$test = new test();
var_dump($test);
//输出结果：object(test)#1 (1) { [0]=> string(4) "name" }