PHP Australia Conference 2015

gmp_invert

(PHP 4 >= 4.0.4, PHP 5)

gmp_invertInverse 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

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