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);
运行结果如下：
object(a)[1] public 'val' => int 30 public 'b' => object(b)[2] public 'val' => int 40 object(a)[3] public 'val' => int 20 public 'b' => object(b)[2] public 'val' => int 40
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);
运行结果如下：
object(a)[1] public 'val' => int 30 public 'b' => object(b)[2] public 'val' => int 40 object(a)[3] public 'val' => int 20 public 'b' => object(b)[4] public 'val' => int 10
希望本文所述对大家php程序设计有所帮助。
更多php对象克隆clone用法示例。