Rounding help....

krrose27

PHP... 5.2.8

I need to take an integer it can be anywhere from 1-100000.......

For the number I want to round down always.....

1 - > 1
5 - > 5
10 - > 10
13 - > 10
15 - > 10
19 - > 10
26 - > 20
112 - > 100
160 - > 100
2666 - > 2000
39999 - > 30000

Any help?

bradgrafelman

function roundInt($num) {
	if((int)$num !== $num)
		return $num; // non int's simply get returned

$num = (string)$num;
return $num[0] . str_repeat('0', strlen($num)-1);
}

EDIT: Alternate method:

function roundInt($num) {
	$len = strlen((string)abs($num)) - 1;
	return floor($num / pow(10, $len)) * pow(10, $len);
}

Note that this handles negative numbers in a way that you may not desire, e.g. roundInt(-35) will return -40. If you'd rather it return -30, then it becomes a bit more complicated:

function roundInt($num) {
	$len = strlen((string)abs($num)) - 1;
	if($num >= 0)
		return floor($num / pow(10, $len)) * pow(10, $len);
	else
		return ceil($num / pow(10, $len)) * pow(10, $len);
}