将cm转换为km,米和cm

Question

我正在尝试做一个我需要做的活动,以厘米为单位,程序必须以km,m和cm返回它.

例如: 270004 cm = 2km,700m,4cm // 100cm = 0km,1m,0cm.

我已经完成了这个代码,但是,有时我会得到负数,有时我会得到奇怪的数字.

也许是我使用的原因PHP_ROUND_HALF_UP??

我该怎么做才能解决它？

//I have an HTML form to introduce the number value
$num = 123456789;

$km = $num/1000;
$km = round($km, 0, PHP_ROUND_HALF_UP);
echo "km: ".$km."<br>";

$subtraction = ($km * 1000) - $num;
$m = $subtraction / 100;
$m = round($m, 0, PHP_ROUND_HALF_UP);

echo "m: ".$m."<br>";

$subtraction2 = ($m * 100) - $subtraction;
$cm = $subtraction2;

echo "cm: ".$cm."<br>";           

Answer 1

老实说,你的代码似乎有点过于复杂:P听说过模数除法吗？在这里派上用场!

<?php

$x = 123456789323; // centimeters

$km  = floor($x / 100000); // amount of "full" kilometers
$rkm = $x % 100000; // rest

$m  = floor($rkm / 100); // amount of "full" meters"
$cm = $rkm % 100; // rest

echo $x . ' cm = ' . $km . ' kilometers ' . $m . ' meters and ' . $cm . 'centimeters' . PHP_EOL;