PHP之克隆clone

浅克隆：只是克隆对象中的非对象非资源数据，即对象中属性存储的是对象类型，则会出现克隆不完全

<?php class B{ public $val = 10; } class A{ public $val = 20; public $b; public function __construct(){ $this->b = new B(); } } $obj_a = new A(); $obj_b = clone $obj_a; $obj_a->val = 30; $obj_a->b->val = 40; var_dump($obj_a); echo '<br>'; var_dump($obj_b);

深克隆：一个对象的所有属性数据都彻底的复制，需要使用魔术方法__clone()，并在里面实现深度克隆

<?php class B{ public $val = 10; } class A{ public $val = 20; public $b; public function __construct(){ $this->b = new B(); } public function __clone(){ $this->b = clone $this->b; } } $obj_a = new A(); $obj_b = clone $obj_a; $obj_a->val = 30; $obj_a->b->val = 40; var_dump($obj_a); echo '<br>'; var_dump($obj_b);