# gmp_invert

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

gmp_invertInverse by modulo

### Descrição

gmp_invert( `\$num1`, `\$num2`):

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

`<?phpecho 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

athamidn at gmail dot com
4 years ago
`Example #2 gmp_invert() example<?phpecho gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSEIt 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 = 05 * 3 mod 10 = 55 * 4 mod 10 = 05 * 5 mod 10 = 55 * 6 mod 10 = 05 * 7 mod 10 = 55 * 8 mod 10 = 05 * 9 mod 10 = 5We 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:95 * 9 mod 11 = 1`