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  • php __clone实现

    <?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) } }
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  • 原文地址:https://www.cnblogs.com/timelesszhuang/p/3964257.html
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