Setting number of decimal places of a number with no rounding.

Simon_Hartley

I am trying to reduce the number of decimal places for a given number to 2 without it being rounded up.

Eg 118.74999669307

becomes 118.74 not 118.75

I've looked at the manual and tried number_format() but that rounds the number up.

Any ideas?

bpat1434

Yes. [man]substr[/man]

<?php

$num = 118.74999669307;

$cut = substr($num, 0, ((strpos($num, '.')+1)+2));
// Cut the string from first character to a length of 2 past the decimal.
// substr(cut what, start, ( (find position of decimal)+decimal itself)+spaces after decimal) )

echo $cut;

?>

Works.

You can even make this into a function like so:

function sigdig($num, $sep='.', $sig=2, $ret=FALSE)
{
	$cut = substr($num, 0, ( (strpos($num, $sep)+1)+$sig ));

if($ret){ return $cut; }
else{ echo $cut; }
}

$num = array(118.74999669307, 18501.183501, 65184.16510083, 514.6611);

foreach($num as $n)
{
	sigdig($n, '.');
	echo '<br>';
}

That outputs:

~Brett

moraru

other idea is:

<?
$some_number = "12.3454645645";
list($int,$dec) = split("\.",$some_number);
$the_number = $int.".".substr($dec,0,2);
echo $the_number;
?>

Simon_Hartley

Many many thanks guys.

This has helped me no end and saved a bit of headache for me.

Weedpacket

or $the_number = floor($some_number*100)/100; assuming we're not talking about negatives.

markfc

does sprintf do something similar as well?

bpat1434

sprintf could work, if they wanted the number rounded. But I haven't found a sprintf function that would do what we wanted.

~Brett