本文實(shí)例講述了PHP對象克隆clone用法。分享給大家供大家參考，具體如下：
淺克隆：只是克隆對象中的非對象非資源數(shù)據(jù)，即對象中屬性存儲的是對象類型，則會出現(xiàn)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);運(yùn)行結(jié)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?。?/strong>一個(gè)對象的所有屬性數(shù)據(jù)都徹底的復(fù)制，需要使用魔術(shù)方法__clone()，并在里面實(shí)現(xiàn)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);運(yùn)行結(jié)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
希望本文所述對大家PHP程序設(shè)計(jì)有所幫助。
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