# gmp_invert

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

gmp_invertInverse by modulo

### Опис

GMP gmp_invert ( GMP `\$a` , GMP `\$b` )

Computes the inverse of `a` modulo `b`.

### Параметри

`a`

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.

`b`

Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is possible to convert the latter to a number.

### Значення, що повертаються

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

### Приклади

Приклад #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";?> ```

Наведений вище приклад виведе:

```9
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``` 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 ```