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gmp_invert

(PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8)

gmp_invertInverse by modulo

Description

gmp_invert(GMP|int|string $num1, GMP|int|string $num2): GMP|false

Computes the inverse of num1 modulo num2.

Parameters

num1

A GMP object, an int or a numeric string.

num2

A GMP object, an int or a numeric string.

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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User Contributed Notes 1 note

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athamidn at gmail dot com
3 years ago
Example #2 gmp_invert() example
<?php
echo gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSE

It means (5 * x ) mod 10 = 1. And with this function we want a value for x, because of mod 10, x should be {1.. 10-1(9)}, so :

5 * 1 mod 10 = 5
5
* 2 mod 10 = 0
5
* 3 mod 10 = 5
5
* 4 mod 10 = 0
5
* 5 mod 10 = 5
5
* 6 mod 10 = 0
5
* 7 mod 10 = 5
5
* 8 mod 10 = 0
5
* 9 mod 10 = 5
We don
't have any 1 in the results. so it will be False.

$invert = gmp_invert("5", "11");

echo gmp_strval($invert) . "\n";
?>

The above example will output:

9

5 * 9 mod 11 = 1
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