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PHP整数取余返回负数的相关解决方法_PHP

Jun 01, 2016 am 11:53 AM
Take remainder

PHP语言虽然功能强大,但并不代表其没有缺点,在编写代码的过程中未免会遇到一些让人头痛的问题。下面我们将为大家介绍有关PHP整数取余返回负数的解决办法。

我们先来看个例子.

复制代码 代码如下:
$res = 16244799483;
echo $res%9999999;
// 输出结果为 -5069794, 正确的结果应该是4801107

其实这也算上PHP一个BUG吧.最主要是PHP是个弱类型语言.他内置了机器来判断用户的类型.

但是机器毕竟是机器.也有判断出错的时候.就像上面.所以这时候我们就需要人工干预下.

所以我就想到要用下面的方法来解决PHP整数取余返回负数的问题.

复制代码 代码如下:
$res = floatval(16244799483);
var_dump($res % 9999999);

我们看到结果还是错误的-5069794.

但是值得注意的是返回是一个int类型的.

详细思考了一下.PHP整数取余返回负数的问题是这样处理的.

PHP取余默认为整数的.

而且当你定义$res = 16244799483;

其实就已经溢出了.所以要加上强制类型转换.变成float类型.

但是这样还不够.因为%这个取模计算还是针对整数的.

所以我们需要一个函数fmod.是针对float类型的.

所以最终PHP整数取余返回负数的解决办法为:

复制代码 代码如下:
$res = floatval(16244799483);
var_dump(fmod($res,9999999));

这样我们就解决了PHP整数取余返回负数这个问题.:)

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