(PHP 8 >= 8.4.0)
bcround — Round arbitrary precision number
$num, int $precision = 0, RoundingMode $mode = RoundingMode::HalfAwayFromZero): string
Returns the rounded value of num to
specified precision
(number of digits after the decimal point).
precision can also be negative or zero (default).
numThe value to round.
precisionThe optional number of decimal digits to round to.
If the precision is positive, num is
rounded to precision significant digits after the decimal point.
If the precision is negative, num is
rounded to precision significant digits before the decimal point,
i.e. to the nearest multiple of pow(10, -$precision), e.g. for a
precision of -1 num is rounded to tens,
for a precision of -2 to hundreds, etc.
mode
Returns a numeric string representing num rounded to the given precision.
This function throws a ValueError in the following cases:
num is not a well-formed BCMath numeric string.scale is outside the valid range.Example #1 bcround() examples
<?php
var_dump(bcround('3.4'));
var_dump(bcround('3.5'));
var_dump(bcround('3.6'));
var_dump(bcround('3.6', 0));
var_dump(bcround('5.045', 2));
var_dump(bcround('5.055', 2));
var_dump(bcround('345', -2));
var_dump(bcround('345', -3));
var_dump(bcround('678', -2));
var_dump(bcround('678', -3));
?>The above example will output:
string(1) "3" string(1) "4" string(1) "4" string(1) "4" string(4) "5.05" string(4) "5.06" string(3) "300" string(1) "0" string(3) "700" string(4) "1000"
Example #2
Example of using bcround() with different precision values
<?php
$number = '123.45';
var_dump(bcround($number, 3));
var_dump(bcround($number, 2));
var_dump(bcround($number, 1));
var_dump(bcround($number, 0));
var_dump(bcround($number, -1));
var_dump(bcround($number, -2));
var_dump(bcround($number, -3));
?>The above example will output:
string(7) "123.450" string(6) "123.45" string(5) "123.5" string(3) "123" string(3) "120" string(3) "100" string(1) "0"
Example #3
Example of using bcround() with different mode values
<?php
echo 'Rounding modes with 9.5' . PHP_EOL;
var_dump(bcround('9.5', 0, RoundingMode::HalfAwayFromZero));
var_dump(bcround('9.5', 0, RoundingMode::HalfTowardsZero));
var_dump(bcround('9.5', 0, RoundingMode::HalfEven));
var_dump(bcround('9.5', 0, RoundingMode::HalfOdd));
var_dump(bcround('9.5', 0, RoundingMode::TowardsZero));
var_dump(bcround('9.5', 0, RoundingMode::AwayFromZero));
var_dump(bcround('9.5', 0, RoundingMode::NegativeInfinity));
var_dump(bcround('9.5', 0, RoundingMode::PositiveInfinity));
echo PHP_EOL;
echo 'Rounding modes with 8.5' . PHP_EOL;
var_dump(bcround('8.5', 0, RoundingMode::HalfAwayFromZero));
var_dump(bcround('8.5', 0, RoundingMode::HalfTowardsZero));
var_dump(bcround('8.5', 0, RoundingMode::HalfEven));
var_dump(bcround('8.5', 0, RoundingMode::HalfOdd));
var_dump(bcround('8.5', 0, RoundingMode::TowardsZero));
var_dump(bcround('8.5', 0, RoundingMode::AwayFromZero));
var_dump(bcround('8.5', 0, RoundingMode::NegativeInfinity));
var_dump(bcround('8.5', 0, RoundingMode::PositiveInfinity));
?>The above example will output:
Rounding modes with 9.5 string(2) "10" string(1) "9" string(2) "10" string(1) "9" string(1) "9" string(2) "10" string(1) "9" string(2) "10" Rounding modes with 8.5 string(1) "9" string(1) "8" string(1) "8" string(1) "9" string(1) "8" string(1) "9" string(1) "8" string(1) "9"
Example #4
Example of using bcround() with different mode values
when specifying precision
<?php
echo 'Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfAwayFromZero));
var_dump(bcround(-1.55, 1, RoundingMode::HalfAwayFromZero));
echo PHP_EOL;
echo 'Using RoundingMode::HalfTowardsZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfTowardsZero));
var_dump(bcround(-1.55, 1, RoundingMode::HalfTowardsZero));
echo PHP_EOL;
echo 'Using RoundingMode::HalfEven with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfEven));
var_dump(bcround(-1.55, 1, RoundingMode::HalfEven));
echo PHP_EOL;
echo 'Using RoundingMode::HalfOdd with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::HalfOdd));
var_dump(bcround(-1.55, 1, RoundingMode::HalfOdd));
echo PHP_EOL;
echo 'Using RoundingMode::TowardsZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::TowardsZero));
var_dump(bcround(-1.55, 1, RoundingMode::TowardsZero));
echo PHP_EOL;
echo 'Using RoundingMode::AwayFromZero with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::AwayFromZero));
var_dump(bcround(-1.55, 1, RoundingMode::AwayFromZero));
echo PHP_EOL;
echo 'Using RoundingMode::NegativeInfinity with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::NegativeInfinity));
var_dump(bcround(-1.55, 1, RoundingMode::NegativeInfinity));
echo PHP_EOL;
echo 'Using RoundingMode::PositiveInfinity with 1 decimal digit precision' . PHP_EOL;
var_dump(bcround( 1.55, 1, RoundingMode::PositiveInfinity));
var_dump(bcround(-1.55, 1, RoundingMode::PositiveInfinity));
?>The above example will output:
Using RoundingMode::HalfAwayFromZero with 1 decimal digit precision string(3) "1.6" string(4) "-1.6" Using RoundingMode::HalfTowardsZero with 1 decimal digit precision string(3) "1.5" string(4) "-1.5" Using RoundingMode::HalfEven with 1 decimal digit precision string(3) "1.6" string(4) "-1.6" Using RoundingMode::HalfOdd with 1 decimal digit precision string(3) "1.5" string(4) "-1.5" Using RoundingMode::TowardsZero with 1 decimal digit precision string(3) "1.5" string(4) "-1.5" Using RoundingMode::AwayFromZero with 1 decimal digit precision string(3) "1.6" string(4) "-1.6" Using RoundingMode::NegativeInfinity with 1 decimal digit precision string(3) "1.5" string(4) "-1.6" Using RoundingMode::PositiveInfinity with 1 decimal digit precision string(3) "1.6" string(4) "-1.5"