两个或多个时间间隔之间的持续时间（以PHP表示）

Question

I have time interval as below,

1-  07:00:00 to 09:30:00 (duration 02:30:00)
2-  08:00:00 to 11:00:00 (duration 03:00:00)

But actual combined duration is 07:00:00 - 11:00:00 (Dur 04:00:00). When we are adding 2 individual duration it will give result 5:30:00..like this different combinations may happen(1-7,5-8,9-10,6-9:30) I want a logic to find actual duration without considering intersecting time intervals. If it is already answered kindly give me the path to it. Thanks in Advance. Note: It is to calculate the duration of work done from attendance data and on duty slips

Answer 1

enter code here

function compareTimes($start,$end)  
 {
 $count=count($start);
 for($i=0;$i<$count;$i++)
 {
  for($j=0;$j<$count;$j++)
  {
   if($j==$i)
   {

   }
   elseif($start[$j]>=$start[$i] and $start[$j]<=$end[$i]) 
   {
     if($end[$j]>=$start[$i] and $end[$j]<=$end[$i]) 
     {
       $start[$j]="0";
       $end[$j]="0";
     }  
     else
     {
        $end[$i]=$end[$j];
        $start[$j]="0";
       $end[$j]="0";
     }
   }

  }
 }
 $dur=0;
 $count1=count($start);
 for($i=0;$i<$count1;$i++)
 {
  $dur1=$end[$i]-$start[$i];
  $dur=$dur1+$dur;
 }
  return $dur;   
 }

// EXAMPLE FOR THE PERIOD 5-6,4-8 &8-9

  $start=array("5","4","8");

  $end=array("6","8","9");
  $check=compareTimes($start,$end);