在PHP中扣除x％

Question

这是我正在尝试做的一个例子。任何有关最佳实践的帮助都会非常有帮助！

<?php 

$fullprice = "5990";

$discount = "30"; // This is 30 percentage

echo = $fullprice - $discount; // Here i need to deduct 30% from the fullprice ?

?>

Answer 1

echo $fullprice * ((100 - $discount) / 100);

Answer 2

$fullprice = 5990;

$discount = 30; // This is 30 percentage

echo $fullprice * ((100 - $discount) / 100);

Answer 3

 echo $fullprice * (1 - $discount/100); 

Answer 4

白痴证明折扣价格计算：

$fullPrice * (100 - max(0, min(100, $discount))) / 100;

它压缩了0到100之间的折扣百分比。