PHP Manual: BcMath\Number::add

Description

public function BcMath\Number::add(BcMath\Number|string|int $num, ?int $scale = null): BcMath\Number

Adds $this and num.

Parameters

num: The value to add.
scale: BcMath\Number::scale explicitly specified for calculation results. If null, the BcMath\Number::scale of the calculation result will be set automatically.

Return Values

Returns the result of addition as a new BcMath\Number object.

When the BcMath\Number::scale of the result object is automatically set, the greater BcMath\Number::scale of the two numbers used for addition is used.

That is, if the BcMath\Number::scales of two values are 2 and 5 respectively, the BcMath\Number::scale of the result will be 5.

Errors/Exceptions

This method throws a ValueError in the following cases:

num is string and not a well-formed BCMath numeric string
scale is outside the valid range

Examples

Example #1 BcMath\Number::add() example when scale is not specified

<?php
$number = new BcMath\Number('1.234');

$ret1 = $number->add(new BcMath\Number('2.34567'));
$ret2 = $number->add('-3.456');
$ret3 = $number->add(7);

var_dump($number, $ret1, $ret2, $ret3);
?>

The above example will output:

object(BcMath\Number)#1 (2) {
  ["value"]=>
  string(5) "1.234"
  ["scale"]=>
  int(3)
}
object(BcMath\Number)#3 (2) {
  ["value"]=>
  string(7) "3.57967"
  ["scale"]=>
  int(5)
}
object(BcMath\Number)#2 (2) {
  ["value"]=>
  string(6) "-2.222"
  ["scale"]=>
  int(3)
}
object(BcMath\Number)#4 (2) {
  ["value"]=>
  string(5) "8.234"
  ["scale"]=>
  int(3)
}

Example #2 BcMath\Number::add() example of explicitly specifying scale

<?php
$number = new BcMath\Number('1.234');

$ret1 = $number->add(new BcMath\Number('2.34567'), 1);
$ret2 = $number->add('-3.456', 10);
$ret3 = $number->add(7, 0);

var_dump($number, $ret1, $ret2, $ret3);
?>