計算時間範圍內的折扣時間數

Question

我有一個預訂系統，您可以在此預訂任意時間的汽車並按小時付費。夜間10點至8點之間的時間可以打折。有沒有人有一個優雅的解決方案來計算預訂的總分鐘數和打折時間，最好在php中？

我最初的嘗試包括計算整整兩天，找到了全天全價的時間和折扣時間：

date_default_timezone_set('Europe/Oslo'); 
$discount_fraction=10/24; 
$discount=0; 
$full=0; 
$from=strtotime("2015-09-16 12:00"); $to=strtotime("2015-09-20 14:00"); //example 
$total=$to-$from; // seconds 
$full_days=floor($total/60/60/24)*24*60*60; // seconds 

$discount+=$full_days*$discount_fraction; // discounted seconds 
$full+=(1-$discount_fraction)*$full_days; // full price seconds 

現在我只剩下提醒：

$reminder=fmod($total, 60*60*24); 

然而，這是我的麻煩真正開始的地方。我想有一些方法標準化的時代，使我不必有超過數的if/else若的，但我不能讓它工作：

$from=date('H',$from)*60*60+date('i',$from)*60+date('s',$from); // seconds 
$to=$reminder; // seconds 

$twentyfour=24*60*60; // useful values 
$fourteen=14*60*60; 
$ten=10*60*60; 
$eight=8*60*60; 
$twentyto=22*60*60; 

這似乎是工作時$從 - 時間< 8：

$d=0; 
$f=0; 
if($to<=($eight-$from)) $d=$reminder; 
else if($to<=$twentyto-$from){ 
    $d=$eight-$from; 
    $f=$to-($eight-$from); 
} 
else if($to<$eight+$twentyfour-$from){ 
    $f=$fourteen; 
    $d=$to-$fourteen; 
} 
else if($to<$twentyto+$twentyfour-$from){ 
    $d=$ten; 
    $f=$to-$ten; 
} 
$discount+=$d; 
$full+=$f; 

任何人都喜歡對它進行破解？

Answer 1

我不如最後發表我如何解決它。折扣期從晚上2200 - 0800。有點失望，我不得不去循環預訂，而不是一些更加優雅的方式，我敢肯定存在，但是這種方法很有效，而且我猜也足夠了。

$interval=30; // allow thirty minutes interval, eg 12:30 - 14:00 
$int=$interval*60; // interval in seconds 
$twentyfour=24*60*60; // 24 hours in seconds 
$eight=8*60*60; // 8 hours in seconds 
$twentyto=22*60*60; // 22 hours in seconds 

// fraction of a 24-hour period thats discounted 
$discount_fraction=10/24; 
$discount=0; // seconds at discount price 
$full=0; // seconds at full price 
$from=strtotime("2015-09-16 06:00"); //example input 
$to=strtotime("2015-09-20 04:00"); //example input 
$total=$to-$from; // Total number of seconds booked 

// full days booked, in seconds 
$full_days=floor($total/60/60/24)*24*60*60; 
// discounted secs within the full days 
$discount+=$full_days*$discount_fraction; 
// full price secs within the full days 
$full+=(1-$discount_fraction)*$full_days; 

$reminder=fmod($total, 60*60*24); //remaining time less than 24 hours 

//start hour of remaining time 
$from=date('H',$from)*60*60+date('i',$from)*60+date('s',$from); 

// looping from start-time to start+reminder, 
// using the order interval as increment, and 
// starting as start plus 1/2 order-interval 
for($i=$from+$int/2; $i<$from+$reminder; $i+=$int){ 
    if(($i>0 && $i<$eight) || 
     ($i>$twentyto && $i<$twentyfour+$eight) || 
     ($i>$twentyfour+$twentyto)) { 
      $discount+=$int; 
    } 
    else{ 
     $full+=$int; 
    } 
} 
echo "Minutes at discount price ".($discount/60); 
echo "Minutes at full price ".($full/60);