BcMath\Number::round

(PHP 8 >= 8.4.0)

BcMath\Number::round — Redondea un número de precisión arbitraria

Descripción

public BcMath\Number::round(int $precision = 0, RoundingMode $mode = RoundingMode::HalfAwayFromZero): BcMath\Number

Devuelve el valor redondeado de $this a la precisión especificada (el número de dígitos después del punto decimal). precisión puede ser también negativo o nulo (por omisión).

Parámetros

precision

El 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

Especifica el método de redondeo. Para más información sobre los métodos, ver RoundingMode.

Valores devueltos

Devuelve el resultado en forma de un nuevo objeto BcMath\Number.

Errores/Excepciones

Este método lanza una ValueError si se especifica un mode inválido.

Ejemplos

Ejemplo #1 Ejemplo de BcMath\Number::round()

<?php
var_dump(
    new BcMath\Number('3.4')->round(),
    new BcMath\Number('3.5')->round(),
    new BcMath\Number('3.6')->round(),
    new BcMath\Number('3.6')->round(0),
    new BcMath\Number('5.045')->round(2),
    new BcMath\Number('5.055')->round(2),
    new BcMath\Number('345')->round(-2),
    new BcMath\Number('345')->round(-3),
    new BcMath\Number('678')->round(-2),
    new BcMath\Number('678')->round(-3),
);
?>

El ejemplo anterior mostrará:

object(BcMath\Number)#2 (2) {
  ["value"]=>
  string(1) "3"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#3 (2) {
  ["value"]=>
  string(1) "4"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(1) "4"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#5 (2) {
  ["value"]=>
  string(1) "4"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#6 (2) {
  ["value"]=>
  string(4) "5.05"
  ["scale"]=>
  int(2)
}
object(BcMath\Number)#7 (2) {
  ["value"]=>
  string(4) "5.06"
  ["scale"]=>
  int(2)
}
object(BcMath\Number)#8 (2) {
  ["value"]=>
  string(3) "300"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#9 (2) {
  ["value"]=>
  string(1) "0"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#10 (2) {
  ["value"]=>
  string(3) "700"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#11 (2) {
  ["value"]=>
  string(4) "1000"
  ["scale"]=>
  int(0)
}

Ejemplo #2 Ejemplo de uso de BcMath\Number::round() con diferentes valores de precisión

<?php
$number = new BcMath\Number('123.45');

var_dump(
    $number->round(3),
    $number->round(2),
    $number->round(1),
    $number->round(0),
    $number->round(-1),
    $number->round(-2),
    $number->round(-3),
);
?>

El ejemplo anterior mostrará:

object(BcMath\Number)#2 (2) {
  ["value"]=>
  string(7) "123.450"
  ["scale"]=>
  int(3)
}
object(BcMath\Number)#3 (2) {
  ["value"]=>
  string(6) "123.45"
  ["scale"]=>
  int(2)
}
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(5) "123.5"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#5 (2) {
  ["value"]=>
  string(3) "123"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#6 (2) {
  ["value"]=>
  string(3) "120"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#7 (2) {
  ["value"]=>
  string(3) "100"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#8 (2) {
  ["value"]=>
  string(1) "0"
  ["scale"]=>
  int(0)
}

Ejemplo #3 Ejemplo de uso de BcMath\Number::round() con diferentes valores de mode

<?php
echo 'Modos de redondeo con 9.5' . PHP_EOL;
$number = new BcMath\Number('9.5');
var_dump(
    $number->round(0, RoundingMode::HalfAwayFromZero),
    $number->round(0, RoundingMode::HalfTowardsZero),
    $number->round(0, RoundingMode::HalfEven),
    $number->round(0, RoundingMode::HalfOdd),
    $number->round(0, RoundingMode::TowardsZero),
    $number->round(0, RoundingMode::AwayFromZero),
    $number->round(0, RoundingMode::NegativeInfinity),
    $number->round(0, RoundingMode::PositiveInfinity),
);

echo PHP_EOL;
echo 'Modos de redondeo con 8.5' . PHP_EOL;
$number = new BcMath\Number('8.5');
var_dump(
    $number->round(0, RoundingMode::HalfAwayFromZero),
    $number->round(0, RoundingMode::HalfTowardsZero),
    $number->round(0, RoundingMode::HalfEven),
    $number->round(0, RoundingMode::HalfOdd),
    $number->round(0, RoundingMode::TowardsZero),
    $number->round(0, RoundingMode::AwayFromZero),
    $number->round(0, RoundingMode::NegativeInfinity),
    $number->round(0, RoundingMode::PositiveInfinity),
);
?>

El ejemplo anterior mostrará:

Modos de redondeo con 9.5
object(BcMath\Number)#3 (2) {
  ["value"]=>
  string(2) "10"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#5 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#7 (2) {
  ["value"]=>
  string(2) "10"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#9 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#11 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#13 (2) {
  ["value"]=>
  string(2) "10"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#15 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#17 (2) {
  ["value"]=>
  string(2) "10"
  ["scale"]=>
  int(0)
}

Modos de redondeo con 8.5
object(BcMath\Number)#1 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#15 (2) {
  ["value"]=>
  string(1) "8"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#13 (2) {
  ["value"]=>
  string(1) "8"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#11 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#9 (2) {
  ["value"]=>
  string(1) "8"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#7 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#5 (2) {
  ["value"]=>
  string(1) "8"
  ["scale"]=>
  int(0)
}
object(BcMath\Number)#3 (2) {
  ["value"]=>
  string(1) "9"
  ["scale"]=>
  int(0)
}

Ejemplo #4 Ejemplo de uso de BcMath\Number::round() con diferentes valores de mode especificando precisión

<?php
$positive = new BcMath\Number('1.55');
$negative = new BcMath\Number('-1.55');

echo 'Uso de RoundingMode::HalfAwayFromZero con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::HalfAwayFromZero),
    $negative->round(1, RoundingMode::HalfAwayFromZero),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::HalfTowardsZero con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::HalfTowardsZero),
    $negative->round(1, RoundingMode::HalfTowardsZero),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::HalfEven con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::HalfEven),
    $negative->round(1, RoundingMode::HalfEven),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::HalfOdd con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::HalfOdd),
    $negative->round(1, RoundingMode::HalfOdd),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::TowardsZero con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::TowardsZero),
    $negative->round(1, RoundingMode::TowardsZero),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::AwayFromZero con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::AwayFromZero),
    $negative->round(1, RoundingMode::AwayFromZero),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::NegativeInfinity con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::NegativeInfinity),
    $negative->round(1, RoundingMode::NegativeInfinity),
);

echo PHP_EOL;
echo 'Uso de RoundingMode::PositiveInfinity con precisión de 1 dígito decimal' . PHP_EOL;
var_dump(
    $positive->round(1, RoundingMode::PositiveInfinity),
    $negative->round(1, RoundingMode::PositiveInfinity),
);
?>

El ejemplo anterior mostrará:

Uso de RoundingMode::HalfAwayFromZero con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.6"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#5 (2) {
  ["value"]=>
  string(4) "-1.6"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::HalfTowardsZero con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.5"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#6 (2) {
  ["value"]=>
  string(4) "-1.5"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::HalfEven con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.6"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#7 (2) {
  ["value"]=>
  string(4) "-1.6"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::HalfOdd con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.5"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#8 (2) {
  ["value"]=>
  string(4) "-1.5"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::TowardsZero con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.5"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#9 (2) {
  ["value"]=>
  string(4) "-1.5"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::AwayFromZero con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.6"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#10 (2) {
  ["value"]=>
  string(4) "-1.6"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::NegativeInfinity con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.5"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#11 (2) {
  ["value"]=>
  string(4) "-1.6"
  ["scale"]=>
  int(1)
}

Uso de RoundingMode::PositiveInfinity con precisión de 1 dígito decimal
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(3) "1.6"
  ["scale"]=>
  int(1)
}
object(BcMath\Number)#12 (2) {
  ["value"]=>
  string(4) "-1.5"
  ["scale"]=>
  int(1)
}

Ver también

bcround() - Redondea un número de precisión arbitraria
BcMath\Number::ceil() - Redondea al alza un número de precisión arbitraria
BcMath\Number::floor() - Redondea hacia abajo un número de precisión arbitraria

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