我创建了电子商务网站,即将提供午餐和晚餐服务。我在这里提出问题/问题是因为我知道这里有很多可以帮助我的传奇人物。我在网站上添加了套餐/计划部分。
1. Weekly
2. Monthly
以下是订购产品的页面问题表单截图:
我可以轻松计算每周价格,例如如果产品价格为 100 并且用户选择了每周计划并且他选择了从星期一到星期六的日子(仅限一周中的 6 天),那么我们可以使用 6*100 = 600
轻松计算价格.
但是如何计算月度价格呢?
例如:如果用户选择月度计划并选择一周中的 6 天,从星期一到星期六或任何他想选择的日期名称。然后他下订单。现在,
6 * 4 = 24 (6 days * 4 weeks)
24 * 100 = 2400 (days * product price)
但它只计算 4 周,而不是整个月。我想计算整个月。如果我检查当前月份是否为 30 天,则 4 (weeks) + 2 days
如果当前月份是 31 天,则 4 (weeks) + 3 days
.看起来很简单而且完成了,但它也很危险,因为如果那 + 2 或 +3 天是用户在订购月度套餐时未选中的那几天怎么办。
这是我的代码:
<?php
$pCartProducts = $pcart->getPlanCartProducts($userid);
?>
<tbody>
<?php
if($pCartProducts){
$finalPrice = 0;
while($pcPro = $pCartProducts->fetch_assoc()){
$planName = $pcPro['plan_name'];
?>
<tr>
<td data-title="Plan">
<?php echo $planName; ?>
</td>
<?php
$pro_price = $pcPro['pro_price'];
$plan_days = $pcPro['plan_days']; // if user selected 6 days in a week
$totaldays = $plan_days * 4; // 6 * 4 weeks = 24
// Calculating current month days
$month = date('m');
$year = date('Y');
$cal_days = cal_days_in_month(CAL_GREGORIAN, $month, $year);
if($planName == 'Weekly'){
$total_price = $pro_price * $plan_days;
} elseif($planName == 'Monthly'){
if($cal_days == '30'){
$final_tdays = $totaldays + 2; // + 2 days
} elseif($cal_days == '31'){
$final_tdays = $totaldays + 3; // + 3 days
} elseif($cal_days == '29'){
$final_tdays = $totaldays + 1; // + 1 day
} elseif($cal_days == '28'){
$final_tdays = $totaldays; // normal
}
$total_price = $final_tdays * $pro_price; // final days * product price
}
?>
<td data-title="Price">
<span>Rs./<?php echo $total_price; ?></span>
</td>
</tr>
<?php } } ?>
</tbody>
有人可以帮我计算一周中选定几天的月度价格吗? 请帮帮我
最佳答案
你有两个选择
选项1
考虑这个月是固定的天数,例如 30 或 28,然后继续您的工作,就这么简单。
选项 2
一个月就是一个月,可以是 28 天、29、30 或 31。
好的,在这种方法中,我将计算客户使用您的服务的天数,然后乘以价格。我使用内置 DateTime
类及其 friend 的强大功能,根据他将在一周中的哪几天使用该服务,使这种方法适用于每周选项和每月选项DateInterval
和 strtotime
。它会循环抛出从开始日期算起的天数,如果在计划中选择了一周中的这一天,例如(星期日),它将计算在内。
检查一下,并根据需要进行更改,我尝试对其进行评论,但是如果有什么不明显的地方,请发表评论。
<?php
$tz = new DateTimeZone("UTC");
//lets say he chosed the service on Monday and Tuesday and Wednesday
$days = "Monday ,Tuesday, Wednesday";// <-- change to user input
$planDays = translateWeekDaysToNumbers($days);
$planName = "Weekly";// <- change as user input
if($planName == 'Weekly'){
$weekOrMonth = "week";
} else if ($planName == 'Monthly'){
$weekOrMonth = "month";
} else {
//TODO: throw error
}
$startString = "2019-02-01 00:00:00"; // <- change later to "now"
$startDate = new DateTime($startString, $tz);
$afterMonth = new DateTime("@" . strtotime("+1 $weekOrMonth", $startDate->format("U")));
$numberOfDays = $afterMonth->diff($startDate)->days;
$daysOfService = 0; // what we need to calculate
for($i = 0; $i<$numberOfDays + 1; $i++){
$dateInterval = new DateInterval("P{$i}D");
$startDate->add($dateInterval);
if (in_array($startDate->format("w"), $planDays)) $daysOfService ++;
$startDate->sub($dateInterval);//reset to first day
}
$pro_price = 100;// <--- change to your price from the DB
$totalPrice = $daysOfService * $pro_price;
echo $daysOfService . "\n";
echo $totalPrice . "\n";
exit;
/**
* expects string like "Monday ,Tuesday, Wednesday"
separated by comma. case is insensitive
*/
function translateWeekDaysToNumbers(string $days)
{
//dont change the numbers as they are the given by ->format("w")
$daysNumbers = [
"sunday" => 0,
"monday" => 1,
"tuesday" => 2,
"wednesday" => 3,
"thursday" => 4,
"friday" => 5,
"saturday" => 6
];
$days = explode(",", $days);
$planDays = [];
foreach($days as $day){
$day = strtolower(trim($day));
// if unexpected day name is provided
// an undefined index warning will be shown
// better than continue silently
$planDays[] = $daysNumbers[$day];
}
return $planDays;
}
关于javascript - 在php中计算每月包(产品)价格,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57932743/