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PHP Functions
Function: bcpowmod (PHP 5) bcpowmod -- Raise an arbitrary precision number to another, reduced by a specified modulusDescriptionstring 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. Note: Because this method uses the modulus operation, non-natural numbers may give unexpected results. A natural number is any positive non-zero integer. ExamplesThe 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. ?>
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