PHP，将gmdate添加到gmdate

Question

I have a code that looks like this:

        $dagtidhelg = gmdate('H:i', $diffMorning) . "
";
        $kvallstidhelg = gmdate('H:i', $diffNight);

This code runs several times per page since its runt every time a row is loaded from mysql. It can return a time value ie 08:15 and 09:30. This is the lenght of two work sessions.

That works great but now Im stuck, I want to display the total of every work session at the bottom. I have tried this:

        $dagtidhelgtotal = $dagtidhelgtotal + $dagtidhelg;
        $kvalltidhelgtotal = $kvalltidhelgtotal + $kvallstidhelg;

But that only adds the hours togheter, it wont even display the : So Im guessing that Im doing this totaly wrong.

How can I add these times togheter? Maybe convert them to minutes, then add them all togheter?

Answer 1

Add duration together is simple .But you must keep in mind that duration and date are two things completely different. You can write 100:08 for duration but not for date. If your purpose is to keep a duration counter on(one or) every page(s) you need to build a system based on $_SESSION variable. To add two duree you can proceed like this:

function addDuration($duration1,$duration2){

        $result=array_map(function($x,$y){return sprintf("%'.02d", $x+$y);},explode(':',$duration1),explode(':',$duration2));
        if($result[1]>60){
            $result[0]=sprintf("%'.02d",$result[0]+(int)$result[1]/60);
            $result[1]=sprintf("%'.02d",$result[1]%60);
        }elseif($result[1]==60){
            $result[1]="00";
            $result[0]=sprintf("%'.02d",$result[0]+1);
        }
        return  join(':',$result);
}

and the usage in your case could be:

 $dagtidhelgtotal = addDuration($dagtidhelgtotal,$dagtidhelg);

if we suppose that

$dagtidhelgtotal ==='100:09' && $dagtidhelg === '08:08'

then after the addition $dagtidhelgtotal will be equal to '108:17';