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php-请教PHP的floor函数问题

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Release： 2016-06-02 11:33:27
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php

$money=271.29;
echo $money=floor($money*pow(10,2));
这个打印为什么是27129

$money=271.28;
echo $money=floor($money*pow(10,2));
为什么打印的结果是27127

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