PHP. Учебник. 2005

bcpowmod

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bcpowmod

(PHP 5)bcpowmod -- Raise an arbitrary precision number to another, reduced by a specified modulus

Description

string bcpowmod ( string x, string y, string modulus [, int scale] )

- Use the fast-exponentiation method to raise x to the power y with respect to the modulus modulus. The optional scale can be used to set the number of digits after the decimal place in the result.

Замечание: Because this method uses the modulus operation, non-natural numbers may give unexpected results. A natural number is any positive non-zero integer.

Примеры

- The following two statements are functionally identical. The bcpowmod() version however, executes in less time and can accept larger parameters.

<?php $a = bcpowmod($x, $y, $mod); $b = bcmod(bcpow($x, $y), $mod); // $a and $b are equal to each other. ?>

Смотрите также

- bcpow() и bcmod().

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bcpow

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bcscale 22222