PHPExcel意外的浮动行为 [英] PHPExcel unexpected float behavior

问题描述

我正在我的一个项目中创建一个新的PHPExcel对象，奇怪的是，在包含库之后，某些float函数的行为方式. 以round函数为例，在包含PHPExcel后它不会四舍五入.

        echo round(90.00 + 9.71, 2); // outputs 99.71
        $sheet = new \PHPExcel();
        $sheet->getProperties()
            ->setCreator('Bob')
            ->setTitle('Title');

        echo round(90.00 + 9.71, 2); // outputs 99.7099999999
        exit;

有没有解决的办法?我尝试使用setValueExplict，但提示未找到PHPExcel_Cell_DataType::TYPE_STRING.

解决方案

这归因于PHPExcel修改了其计算引擎中的php.ini precision设置.您可以自己覆盖此内容:

echo round(90.00 + 9.71, 2); // outputs 99.71

$savedPrecision = ini_get('precision');
$sheet = new \PHPExcel();
ini_set('precision', $savedPrecision);

echo round(90.00 + 9.71, 2); // outputs 99.71

或者，当您回显浮点值以获取要显示的小数位数时，请使用sprintf()或number_format()

I'm create a new PHPExcel object into one of my projects and whats odd is how some float functions behave after the library is included. Take for example the round function, it will not round after PHPExcel is included.

        echo round(90.00 + 9.71, 2); // outputs 99.71
        $sheet = new \PHPExcel();
        $sheet->getProperties()
            ->setCreator('Bob')
            ->setTitle('Title');

        echo round(90.00 + 9.71, 2); // outputs 99.7099999999
        exit;

Is there a way around this? I tried using setValueExplict but it says PHPExcel_Cell_DataType::TYPE_STRING is not found.

解决方案

This comes down to PHPExcel modifying the php.ini precision setting in its calculation engine. You can override this yourself:

echo round(90.00 + 9.71, 2); // outputs 99.71

$savedPrecision = ini_get('precision');
$sheet = new \PHPExcel();
ini_set('precision', $savedPrecision);

echo round(90.00 + 9.71, 2); // outputs 99.71

or alternatively, use sprintf() or number_format() when you echo float values to get the number of decimals that you want to display

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