PHP | bcpowmod() Function

The bcpowmod() function in PHP is an inbuilt function and is used to raise an arbitrary precision base number to another exponent number reduced by a specified modulus. This function accepts three arbitrary precision numbers as strings and returns the base number raised to exponent modulo under a number after scaling the result to a specified precision.

Syntax:

string bcpowmod ( $base, $exponent, $mod, $scaleVal )

Parameters: This function accepts four parameters as shown in the above syntax and explained below:

• $base: This parameter is of string type and represents the left operand or the number which is the bas in which the power will be raised. This parameter is mandatory.
• $exponent: This parameter is of string type and represents the right operand or one of the number which represent the exponent. This parameter is mandatory.
• $mod: This parameter is of string type and accepts a operand or a number which represents the modulos. This parameter is mandatory.
• $scaleVal: This parameter is of int type and is optional. This parameter tells the number of digits that will appear after the decimal in the result of (base^exponent)%mod. It’s default value is zero.

Return Value: This function returns the ($base^$exponent) % $mod result as string.

Examples:

Input:  $base = 2, $exponent = 3 $mod = 3
Output: 2
Since the parameter $scaleVal is not specified so
no digits after decimal is appeared in the 
result after evaluating result

Input:  $base = 2, $exponent = 3, $mod = 3, $scaleVal = 2
Output: 2.00

Below programs illustrate the bcpowmod() function in PHP :

Program 1:

2

2.0000