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php __clone实现

时间:2014-09-10 14:02:40      阅读:250      评论:0      收藏:0      [点我收藏+]

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<?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() {    //复制方法,可在里面定义再clone是进行的操作
        $this->id = 0;
        $this->account = clone $this->account;    //不加这一句,account在clone是会只被复制引用,其中一个account的balance被修改另一个也同样会被修改
    }

}

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

$person->setId(1);
$person2 = clone $person;

$person2->account->balance = 250;

echo <pre>;
var_dump($person, $person2);
?>

 

结果
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) } }

 

php __clone实现

标签:style   blog   color   io   ar   div   cti   sp   log   

原文地址:http://www.cnblogs.com/timelesszhuang/p/3964257.html

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