PHP中可变长度可变变量
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<p>普通变量</p>
<pre><code><?php
$a = 'hello';
?>
</code></pre>
<p>可变变量</p>
<pre><code><?php
$$a = 'world';
?></code></pre>
<p><?php<br> echo "$a ${$a}";<br> ?></p>
<p></p>
<p></p>
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