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php中$$a,是什么意思?该怎么处理

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Release: 2016-06-13 11:39:19
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php中$$a,是什么意思?

$a="cd";
$$a="finished";
$$a="OK";
echo $cd;
?>
输出结果为“OK”

请问$$a 是什么意思啊?这个结果是怎么回事啊,小弟是小白,往各位大牛们告知啊~~~~

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