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gmp_invert

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

gmp_invertInverse by modulo

Descrição

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

Computes the inverse of num1 modulo num2.

Parâmetros

num1

Um objeto GMP, um int ou uma string numérica.

num2

Um objeto GMP, um int ou uma string numérica.

Valor Retornado

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

Exemplos

Exemplo #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";
?>

O exemplo acima produzirá:

9

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User Contributed Notes 1 note

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3
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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