GMP Functions
PHP Manual

gmp_invert

Inverse by modulo

Description

GMPfalse gmp_invert(GMPintstring $num1, GMPintstring $num2)

Computes the inverse of num1 modulo num2.

Parameters

num1

A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init with automatic base detection (i.e. when base is equal to 0).

num2

A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init with automatic base detection (i.e. when base is equal to 0).

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