PHP对象克隆clone用法 PHP对象克隆clone怎么做，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
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：
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
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：
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
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