php number manipulation

[morleymouse]

So I want to check / make sure the number the user enteres is in the format I want.

I can get it so that the number is an integer quite easily with

$new_number = intval("$old_number");

But say is there any way of making it a multiple of like 0.1 or 0.2 etc?

So it rounds up or down to the nearest tenth?

So I have it set to the nearest tenth and then the user enters 0.7, then it gets entered as 0.1. or 4.21 goes to 4.2 etc

[PaulD]

Have look at the php.net documentation for round() http://uk.php.net/manual/en/function.round.php should do the trick.

Paul

[morleymouse]

cheers paul, did receive help on this via PM.

round is now part of the solution

[Paul Knapp]

Why not store the number as a standard floating point, and only display to the screen the rounded number?

<?

$num = 4.215;

printf("Your rounded number is %01.1f to the nearest tenth",$num);

?>

If you DO want to store the rounded number, I would think sprintf was a much more robust (and faster) way to do it.

<?

$num = 4.215;

$rounded = sprintf("%01.1f",$num);

echo "<b>$num</b> to the nearest tenth is <b>$rounded</b>.";

?>