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Time Calculation

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Feb 26.2006

Hi,

If something starts at 12:00 and ends at 5:00 thats 5 hours.

I am trying to calculate the duration:
When I add this to the page that I am viewing, <? echo($user_data[‘duration’]); ?> nothing happens.

This is what I have so far

[code=php]
 //Calculate Duration
if(isset($user_data[‘startTime’]) && $user_data[‘endTime’] != “00:00”)
$start = strtotime($user_data[‘startTime’]);
$end = strtotime($user_data[‘endTime’]);
$timeSeconds = $end – $start;
$user_data[‘duration’] = round($timeSeconds / 3600, 1);
[/code]

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PHP

8 Comments(s) ↴

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@bfsogFeb 26.2006 — For a start, you have no { and } round your code that dhould run if the if passes true.
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@comptech520authorFeb 26.2006 — the { and } are in the file I am working with, there are just a bunch of other things there so I left it out, but it is there.
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@SheldonFeb 26.2006 — [code=php]
if(isset($user_data['startTime']) && ($user_data['endTime'] != "00:00"))
$start = strtotime($user_data['startTime']);
$end = strtotime($user_data['endTime']);
$timeSeconds = $end - $start;
$user_data['duration'] = round($timeSeconds / 3600, 1);
[/code]
you were missing the brackets around the second string

*($user_data['endTime'] != "00:00"))*

You dont need the braces if you dont have an else

but lets add them and try some debugging
[code=php]
if(isset($user_data['startTime']) && ($user_data['endTime'] != "00:00")){
$start = strtotime($user_data['startTime']);
$end = strtotime($user_data['endTime']);
$timeSeconds = $end - $start;
$user_data['duration'] = round($timeSeconds / 3600, 1);
echo("Success"); /* It is working*/
}else{
echo("start time-".$user_data['startTime'].",<br />end time-=".$user_data['endTime']);
}
/*the else will echo
"start time-,
end time -"
*/ or if only one is set it will echo it, letting you know which is wrong
[/code]
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@comptech520authorFeb 26.2006 — Thanks, but what I was looking for is to calculate the duration

so if the event started at 7:00 AM and ended at 2:00 PM that would be 7 hours (the duration)

Thanks
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@comptech520authorMar 02.2006 — Any luck on this on calculating the duration?

Thanks
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@SheldonMar 02.2006 — well, you coult try work in 24 hour time and minus the higer time from the lower time.

php.net/
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@NogDogMar 02.2006 — Use strtotime() and/or mktime() to convert the time strings into system time (which is in seconds), Subtract the lesser value from the greater, then divide by 3600 (number of seconds in an hour) to get the difference in hours.
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@SpectreReturnsMar 03.2006 — You dont need the braces if you dont have an else[/QUOTE]
I thought you needed braces if you're using more than one statement to branch. Seems the only logical way to be parsed, unless the parser pays attention to indenting... I'm going to go test it.

Tested, and I'm right. Try this baby:
[code=php]if (false)
echo "foo<br>";
echo "bar";[/code]
Output is 'bar'.

Also, when using the no braces syntax, you can use an else:

[code=php]if (false) echo "baz";
else echo "quux";[/code]

As for this:
the { and } are in the file I am working with, there are just a bunch of other things there so I left it out, but it is there.[/QUOTE]
Bad idea. If you need help, post things exactly as you have them, so any problems can be recreated.
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