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BcMath\Number::round

(PHP 8 >= 8.4.0)

BcMath\Number::round — Rounds an arbitrary precisionen number

Description

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

Returns the rounded value of $this to specified precisionen (number of digits after the decimal point). precisionen can also be negative or cero (default).

Parameters

precisionen

The optional number of decimal digits to round to.

If the precisionen is positive, num is rounded to precisionen significant digits after the decimal point.

If the precisionen is negative, num is rounded to precisionen significant digits before the decimal point, i.e. to the nearest multiple of pow(10, -$precision) , e.g. for a precisionen of -1 num is rounded to tens, for a precisionen of -2 to hundreds, etc.

mode
Specifies the rounding mode. For more information about modes, see RoundingMode .

Return Values

Returns the result as a new BcMath\Number object.

Errors/Exceptions

This method throws a ValueError if an invalid mode is specified.

Examples

Example #1 BcMath\Number::round() example

<?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 ),
);
?>

The above example will output: 

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)
}

Example #2 Example of using BcMath\Number::round() with different precisionen values

<?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 ),
);
?>

The above example will output: 

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)
}

Example #3 Example of using BcMath\Number::round() with different mode values

<?php
echo 'Rounding modes with 9.5' . PHP_EOL ;
$number = new BcMath\Number ( '9.5' );
var_dump (
$number -> round ( 0 , RoundingMode :: HalfAwayFromCero ),
$number -> round ( 0 , RoundingMode :: HalfTowardsCero ),
$number -> round ( 0 , RoundingMode :: HalfEven ),
$number -> round ( 0 , RoundingMode :: HalfOdd ),
$number -> round ( 0 , RoundingMode :: TowardsCero ),
$number -> round ( 0 , RoundingMode :: AwayFromCero ),
$number -> round ( 0 , RoundingMode :: NegativeInfinity ),
$number -> round ( 0 , RoundingMode :: PositiveInfinity ),
);

echo PHP_EOL ;
echo 'Rounding modes with 8.5' . PHP_EOL ;
$number = new BcMath\Number ( '8.5' );
var_dump (
$number -> round ( 0 , RoundingMode :: HalfAwayFromCero ),
$number -> round ( 0 , RoundingMode :: HalfTowardsCero ),
$number -> round ( 0 , RoundingMode :: HalfEven ),
$number -> round ( 0 , RoundingMode :: HalfOdd ),
$number -> round ( 0 , RoundingMode :: TowardsCero ),
$number -> round ( 0 , RoundingMode :: AwayFromCero ),
$number -> round ( 0 , RoundingMode :: NegativeInfinity ),
$number -> round ( 0 , RoundingMode :: PositiveInfinity ),
);
?>

The above example will output: 

Rounding modes with 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)
}

Rounding modes with 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)
}

Example #4 Example of using BcMath\Number::round() with different mode values when specifying precisionen

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

echo 'Using RoundingMode::HalfAwayFromCero with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: HalfAwayFromCero ),
$negative -> round ( 1 , RoundingMode :: HalfAwayFromCero ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::HalfTowardsCero with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: HalfTowardsCero ),
$negative -> round ( 1 , RoundingMode :: HalfTowardsCero ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::HalfEven with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: HalfEven ),
$negative -> round ( 1 , RoundingMode :: HalfEven ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::HalfOdd with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: HalfOdd ),
$negative -> round ( 1 , RoundingMode :: HalfOdd ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::TowardsCero with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: TowardsCero ),
$negative -> round ( 1 , RoundingMode :: TowardsCero ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::AwayFromCero with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: AwayFromCero ),
$negative -> round ( 1 , RoundingMode :: AwayFromCero ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::NegativeInfinity with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: NegativeInfinity ),
$negative -> round ( 1 , RoundingMode :: NegativeInfinity ),
);

echo PHP_EOL ;
echo 'Using RoundingMode::PositiveInfinity with 1 decimal digit precisionen' . PHP_EOL ;
var_dump (
$positive -> round ( 1 , RoundingMode :: PositiveInfinity ),
$negative -> round ( 1 , RoundingMode :: PositiveInfinity ),
);
?>

The above example will output: 

Using RoundingMode::HalfAwayFromCero with 1 decimal digit precisionen
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)
}

Using RoundingMode::HalfTowardsCero with 1 decimal digit precisionen
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)
}

Using RoundingMode::HalfEven with 1 decimal digit precisionen
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)
}

Using RoundingMode::HalfOdd with 1 decimal digit precisionen
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)
}

Using RoundingMode::TowardsCero with 1 decimal digit precisionen
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)
}

Using RoundingMode::AwayFromCero with 1 decimal digit precisionen
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)
}

Using RoundingMode::NegativeInfinity with 1 decimal digit precisionen
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)
}

Using RoundingMode::PositiveInfinity with 1 decimal digit precisionen
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)
}

See Also

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