本文实例讲述了PHP对象克隆clone用法。分享给大家供大家参考，具体如下：
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
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<?phpclass 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：
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object(A)[1] public 'val' => int 30 public 'b' => object(B)[2] public 'val' => int 40object(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
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<?phpclass 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：
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object(A)[1] public 'val' => int 30 public 'b' => object(B)[2] public 'val' => int 40object(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。
