PHP对象的底层知识，调用过程
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<blockquote>
<p>class Dog{</p>
<p> public $leg = 12;</p>
<p> public $wei = 2; </p>
<p>}</p>
<p>$dog = new Dog;</p>
<p>$d2 = $dog;</p>
<p>$d2 ->leg = 5;</p>
<p></p>
<p>echo $dog->leg,'~~'$d2->leg;</p>
</blockquote>
<p>最后打印出来的结果</p>
<blockquote>
<p>5~5</p>
</blockquote>
<p></p>
<p></p>
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