Maison >développement back-end >tutoriel php >PHP Clone 深复制和浅复制 clclone hdclone memberwiseclon
今天在看大话设计模式的时候,看到原型模式。其中讲到深复制与浅复制,于是搜索了一下php手册。
看php如何实现深复制与浅复制的。
<code><span><span>class</span><span>SubObject</span> {</span><span>static</span><span>$instances</span> = <span>0</span>; <span>public</span><span>$instance</span>; <span>public</span><span><span>function</span><span>__construct</span><span>()</span> {</span><span>$this</span>->instance = ++ <span>self</span>::<span>$instances</span>; } <span>public</span><span><span>function</span><span>__clone</span><span>()</span> {</span><span>$this</span>->instance = ++<span>self</span>::<span>$instances</span>; } } <span><span>class</span><span>MyCloneable</span> {</span><span>public</span><span>$object1</span>; <span>public</span><span>$object2</span>; <span>public</span><span><span>function</span><span>__clone</span><span>()</span> {</span><span>// 强制复制一份this->object, 否则仍然指向同一个对象</span><span>// 深复制[将自己的属性重新克隆一份]</span><span>$this</span>->object1 = <span>clone</span><span>$this</span>->object1; <span>// 浅复制[引用的还是原来,并没有生成新的]</span><span>//$this->object2 = clone $this->object2;</span> } } <span>$obj</span> = <span>new</span> MyCloneable(); <span>$obj</span>->object1 = <span>new</span> SubObject(); <span>$obj</span>->object2 = <span>new</span> SubObject(); <span>$obj2</span> = <span>clone</span><span>$obj</span>; <span>print</span>(<span>"Original Object:\n"</span>); print_r(<span>$obj</span>); <span>print</span>(<span>"Clone Object:\n"</span>); print_r(<span>$obj2</span>);</code>
结果
<code>Original Object: MyCloneable Object ( [object1] => SubObject Object ( [instance] => <span>1</span> ) [object2] => SubObject Object ( [instance] => <span>2</span> ) ) <span>Clone</span> Object: MyCloneable Object ( [object1] => SubObject Object ( [instance] => <span>3</span><span>//深复制 所以有+1</span> ) [object2] => SubObject Object ( [instance] => <span>2</span><span>//浅复制 并没有创建新的对象</span> ) ) </code>').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i ').text(i)); }; $numbering.fadeIn(1700); }); });
以上就介绍了PHP Clone 深复制和浅复制,包括了clone,php方面的内容,希望对PHP教程有兴趣的朋友有所帮助。