bcpow

PHP 4, PHP 5, PHP 7, PHP 8
bcpow - Raise an arbitrary precision number to another
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Code Examples

bcpow( string$num, string$exponent, [int|null$scale = null] ): string

Raise num to the power exponent.

Parameters

num

The base, as a string.

exponent

The exponent, as a string. If the exponent is non-integral, it is truncated. The valid range of the exponent is platform specific, but is at least -2147483648 to 2147483647.

scale

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.

Notes

Note:

Before PHP 7.3.0 bcpow 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:

bcpow scale example
<?php
echo bcpow('5''2'2);     // prints "25", not "25.00"
?>

Changelog

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

Related Functions

Example of bcpow

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Function bcpow:

BCMath Arbitrary Precision Mathematics Functions

Most used PHP functions