Question

目标：用户仅在给定时间为面额选择一个，仅一个选项，其中某个值仅，一些 Dimes值 仅，或者仅的值。

问题：目前仅代码默认为仅限镍？

预先存在的条件： 如果我选择不同的面额，例如仅限Quarters ，我只获得Nickels的值，这同样适用于Dimes？

代码段：

if($denomination["Nickels"] != NULL)

{
$value = $denomination["Nickels"];
echo $value . " is the value of selected Nickels";
}

else if ($denomination["Dimes"] != NULL)
{
$value = $denomination["Dimes"];
echo $value . " is the value of  selected Dimes";
}

else if ($denomination["Quarters"] != NULL)
{
$value = $denomination["Quarters"];
echo  $value . "is the value of selected Quarters";
}

Answer 1

当第一个条件为真时，“elseif”停止处理（即“Nickels”）。删除“else”并留下简单的“if”s。

Answer 2

简而言之：

<?php
$value = array_shift(array_filter($denomination));
echo  $value . "is the value of selected Quarters";

使用此功能，您无需为每个新元素添加if。

Answer 3

您是否明确将$ denomination数组中的值设置为null？

你有没有想过......

if($denomination["Nickels"])
{
$value = $denomination["Nickels"];
echo $value . " is the value of selected Nickels";
}

else if ($denomination["Dimes"])
{
$value = $denomination["Dimes"];
echo $value . " is the value of  selected Dimes";
}

else if ($denomination["Quarters"])
{
$value = $denomination["Quarters"];
echo  $value . "is the value of selected Quarters";
}

Answer 4

尝试不使用elseifs，将其替换为ifs

if($denomination["Nickels"] != NULL)

{
$value = $denomination["Nickels"];
echo $value . " is the value of selected Nickels";
}

if ($denomination["Dimes"] != NULL)
{
$value = $denomination["Dimes"];
echo $value . " is the value of  selected Dimes";
}

if ($denomination["Quarters"] != NULL)
{
$value = $denomination["Quarters"];
echo  $value . "is the value of selected Quarters";
}

php条件问题

4 个答案: