[Resolved] Convert integer to decimal?

[bunner_bob]

I'm using a form where the user can enter hours (duration) either "clock style" (2:30) or decimal (2.5).

What I need to do is convert decimal format to clock format - I need to explode the decimal version and multiply the part after the decimal point times 60 to get the appropriate number of minutes. Of course, it's NOT "5 x 60" - I need to convert the "5" to a decimal (".5") after I do the exploding. Essentially I need to prefix a period in front of the number, and have it treated as a decimal. Or something like that.

How would I go about this? How would YOU go about it?

• Bob

[mtmosier]

5 * 60 / 10 ? Or simply multiply by 6 instead of 60. (With a comment to explain it, naturally.)

[bunner_bob]

But consider the following input possibilities:

2.75
4.325
1.5

Different lengths of decimal, so can't just arbitrarily divide by 10. Another option (besides exploding) would be to subtract the integer portion (got via "floor") of the number from the number, leaving only the decimal - hey that'll work. I'll try it.

[laserlight]

Easy enough:

<?php
function decclock($time, $clock = 24) {
	return ((int)$time % $clock) . ':' . (($time * 60) % 60);
}
echo decclock(2.5);
?>

Basically, the idea is that in 2.5, 2 is the number of hours since the start of the day, and 0.5 is the number of hours since the start of the hour.

So to obtain the hour portion of your clock format, we just need to typecast to int and take the result modulo 24 (or 12, if you're using a 12 hour clock).
To obtain the minutes portion, we multiply by the number of minutes in an hour (i.e. 60), then take the result modulo 60.

[bunner_bob]

Funny thing - we decided to flip it around and store time as decimal instead of hours and minutes. Much easier for doing math. Which basically means explode the time on the colon and divide the minutes by 60, then add the two parts back together to get decimal hours.

Piece of cake. Thanks for the help tho.

• Bob