基础题:对象引用有关问题
Jun 13, 2016 am 11:42 AM
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基础题:对象引用问题?
<?php<br />$global_obj=null;<br /><br />class Demo{<br /> var $my_val;<br /> public function __construct(){<br /> global $global_obj;<br /> $global_obj=&$this;<br /> }<br />}<br /><br />$p=new Demo();<br /><br />$p->my_val=5;<br /><br />global $global_obj;<br /><br />$global_obj->my_val=10;<br /><br />echo $p->my_val; //输出5<br /><br />var_dump($p===$global_obj); //返回false<br />?>
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请问为什么结果是5 而不是10;
我的理解是:PHP5中,除非你用clone关键字明确要克隆一个对象,否则将永远不会无意识地复制对象。
这样理解对吗?
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