PHP 数减去同数不等于0

Question

我正在尝试使用 PHP 从 119.7 减去 119.7，但结果不是预期的 (-1.4210854715202E-14)，预期结果是 0

Doc1 RestToPay = 171
Doc2 RestToPay = 119.7

这是我的代码：

$TotalAmountToPay = 290.7;
foreach($Docs as $Doc){
    $RestToPay = $Doc['RestToPay'];
    if($TotalAmountToPay <= 0){
        break;
    }
    $TotalAmountToPay = $TotalAmountToPay - $RestToPay;
    if($TotalAmountToPay >= 0){
        echo "OK: ".$TotalAmountToPay;
    }else{
        echo "Done: ".$TotalAmountToPay;
    }
}

我得到的输出：

还行：119.7
完成：-1.4210854715202E-14

Answer 1

这些数字的存储和转换方式似乎有些不同。您始终可以使用 round() 函数，它应该可以满足您的需求。所以也许试试这个：

$TotalAmountToPay = 290.7;
foreach($Docs as $Doc){
    $RestToPay = $Doc['RestToPay'];
    if($TotalAmountToPay <= 0){
        break;
    }
    $TotalAmountToPay = $TotalAmountToPay - $RestToPay;
    if($TotalAmountToPay >= 0){
        echo "OK: ".round($TotalAmountToPay,4);
    }else{
        echo "Done: ".round($TotalAmountToPay,4);
    }
}

Answer 2

应该会有帮助。

$TotalAmountToPay = 290.7;
foreach($Docs as $Doc){
    $RestToPay = $Doc['RestToPay'];
    if($TotalAmountToPay <= 0){
        break;
    }
    $TotalAmountToPay = round($TotalAmountToPay,2) - round($RestToPay,2);
    if($TotalAmountToPay >= 0){
        echo "OK: ".$TotalAmountToPay;
    }else{
        echo "Done: ".$TotalAmountToPay;
    }
}

PHP 数减去同数不等于0

PHP number minus same number not equal 0

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