GMP Functions
PHP Manual

gmp_invert

Inverse by modulo

Description

resource gmp_invert ( resource $a , resource $b )

Computes the inverse of a modulo b.

Parameters

a

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

b

It can be either a GMP number resource, or a numeric string given that it is possible to convert the latter to a number.

Return Values

A GMP number on success or FALSE if an inverse does not exist.

Examples

Example #1 gmp_invert example

<?php
echo gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSE
$invert = gmp_invert("5", "11");
echo gmp_strval($invert) . "\n";
?>

The above example will output:

9