How to make number_format() not to round numbers up
I know that this an old question, but it still actual :) .
How about this function?
function numberFormatPrecision($number, $precision = 2, $separator = '.')
{
$numberParts = explode($separator, $number);
$response = $numberParts[0];
if (count($numberParts)>1 && $precision > 0) {
$response .= $separator;
$response .= substr($numberParts[1], 0, $precision);
}
return $response;
}
Usage:
// numbers test
numberFormatPrecision(19, 2, '.'); // expected 19 return 19
numberFormatPrecision(19.1, 2, '.'); //expected 19.1 return 19.1
numberFormatPrecision(19.123456, 2, '.'); //expected 19.12 return 19.12
numberFormatPrecision(19.123456, 0, '.'); //expected 19 return 19
// negative numbers test
numberFormatPrecision(-19, 2, '.'); // expected -19 return -19
numberFormatPrecision(-19.1, 2, '.'); //expected -19.1 return -19.1
numberFormatPrecision(-19.123456, 2, '.'); //expected -19.12 return -19.12
numberFormatPrecision(-19.123456, 0, '.'); //expected -19 return -19
// precision test
numberFormatPrecision(-19.123456, 4, '.'); //expected -19.1234 return -19.1234
// separator test
numberFormatPrecision('-19,123456', 3, ','); //expected -19,123 return -19,123 -- comma separator
Function (only precision):
function numberPrecision($number, $decimals = 0)
{
$negation = ($number < 0) ? (-1) : 1;
$coefficient = 10 ** $decimals;
return $negation * floor((string)(abs($number) * $coefficient)) / $coefficient;
}
Examples:
numberPrecision(2557.9999, 2); // returns 2557.99
numberPrecision(2557.9999, 10); // returns 2557.9999
numberPrecision(2557.9999, 0); // returns 2557
numberPrecision(2557.9999, -2); // returns 2500
numberPrecision(2557.9999, -10); // returns 0
numberPrecision(-2557.9999, 2); // returns -2557.99
numberPrecision(-2557.9999, 10); // returns -2557.9999
numberPrecision(-2557.9999, 0); // returns -2557
numberPrecision(-2557.9999, -2); // returns -2500
numberPrecision(-2557.9999, -10); // returns 0
Function (full functionality):
function numberFormat($number, $decimals = 0, $decPoint = '.' , $thousandsSep = ',')
{
$negation = ($number < 0) ? (-1) : 1;
$coefficient = 10 ** $decimals;
$number = $negation * floor((string)(abs($number) * $coefficient)) / $coefficient;
return number_format($number, $decimals, $decPoint, $thousandsSep);
}
Examples:
numberFormat(2557.9999, 2, ',', ' '); // returns 2 557,99
numberFormat(2557.9999, 10, ',', ' '); // returns 2 557,9999000000
numberFormat(2557.9999, 0, ',', ' '); // returns 2 557
numberFormat(2557.9999, -2, ',', ' '); // returns 2 500
numberFormat(2557.9999, -10, ',', ' '); // returns 0
numberFormat(-2557.9999, 2, ',', ' '); // returns -2 557,99
numberFormat(-2557.9999, 10, ',', ' '); // returns -2 557,9999000000
numberFormat(-2557.9999, 0, ',', ' '); // returns -2 557
numberFormat(-2557.9999, -2, ',', ' '); // returns -2 500
numberFormat(-2557.9999, -10, ',', ' '); // returns 0
number_format
will always do that, your only solution is to feed it something different:
$number = intval(($number*100))/100;
Or:
$number = floor(($number*100))/100;