php __clone実装

<?php



class Account {



    public $balance;



    public function __construct($balance) {

        $this->balance = $balance;

    }



}



class Person {



    private $id;

    private $name;

    private $age;

    public $account;



    public function __construct($name, $age, Account $account) {

        $this->name = $name;

        $this->age = $age;

        $this->account = $account;

    }



    public function setId($id) {

        $this->id = $id;

    }



    public function __clone() {    //    ,       clone      

        $this->id = 0;

        $this->account = clone $this->account;    //     ,account clone        ,    account balance             

    }



}



$person = new Person("peter", 15, new Account(1000));



$person->setId(1);

$person2 = clone $person;



$person2->account->balance = 250;



echo '<pre>';

var_dump($person, $person2);

?>

  
object(Person)#1 (4) {

  ["id":"Person":private]=>

  int(1)

  ["name":"Person":private]=>

  string(5) "peter"

  ["age":"Person":private]=>

  int(15)

  ["account"]=>

  object(Account)#2 (1) {

    ["balance"]=>

    int(1000)

  }

}

object(Person)#3 (4) {

  ["id":"Person":private]=>

  int(0)

  ["name":"Person":private]=>

  string(5) "peter"

  ["age":"Person":private]=>

  int(15)

  ["account"]=>

  object(Account)#4 (1) {

    ["balance"]=>

    int(250)

  }

}