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bcmul - Multiply two arbitrary precision numbers

bcmul( string$num1, string$num2, [int|null$scale = null] ): string

Multiply the num1 by the num2.



The left operand, as a string.


The right operand, as a string.


This optional parameter is used to set the number of digits after the decimal place in the result. If omitted, it will default to the scale set globally with the bcscale function, or fallback to 0 if this has not been set.

Return Values

Returns the result as a string.



Before PHP 7.3.0 bcmul may return a result with fewer digits after the decimal point than the scale parameter would indicate. This only occurs when the result doesn't require all of the precision allowed by the scale. For example:

bcmul scale example
echo bcmul('5''2'2);     // prints "10", not "10.00"


Version Description
8.0.0 scale is now nullable.
7.3.0 bcmul now returns numbers with the requested scale. Formerly, the returned numbers may have omitted trailing decimal zeroes.

Related Functions

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Function bcmul:

BCMath Arbitrary Precision Mathematics Functions

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