(PHP 8 >= 8.4.0)
bcround — Round arbitrary precision number
$num, int $precision = 0, RoundingMode $mode = RoundingMode::HalfAwayFromZero): string
Returns the rounded value of num to
specified precision
(number of digits after the decimal point).
precision can also be negative or zero (default).
numEl valor a redondear.
precisionEl número opcional de decimales a redondear.
Si el argumento precision es positivo,
num será redondeado utilizando el argumento
precision para definir el número significativo
de dígitos después del punto decimal.
Si el argumento precision es negativo,
num será redondeado utilizando el argumento
precision para definir el número significativo
de dígitos antes del punto decimal, i.e. el múltiplo más cercano
de pow(10, -$precision), i.e. para una
precision de -1, num
será redondeado a 10, para una precision de -2 a 100, 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.mode is specified.Ejemplo #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));
?>El resultado del ejemplo sería:
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"
Ejemplo #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));
?>El resultado del ejemplo sería:
string(7) "123.450" string(6) "123.45" string(5) "123.5" string(3) "123" string(3) "120" string(3) "100" string(1) "0"
Ejemplo #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));
?>El resultado del ejemplo sería:
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"
Ejemplo #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));
?>El resultado del ejemplo sería:
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"