bcpow
Raise an arbitrary precision number to another
Description
string bcpow(string $num, string $exponent, intnull $scale = null)
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.
Examples
Example #1 bcpow example
<?php
echo bcpow('4.2', '3', 2); // 74.08
?>
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:
Example #2 bcpow scale example
<?php
echo bcpow('5', '2', 2); // prints "25", not "25.00"
?>