# gmp_invert

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

gmp_invertInverse by modulo

### 说明

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

Computes the inverse of `num1` modulo `num2`.

### 参数

`num1`

GMP 对象或 int ，或数字string

`num2`

GMP 对象或 int ，或数字string

### 返回值

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

### 示例

`<?phpecho gmp_invert("5", "10"); // no inverse, outputs nothing, result is FALSE\$invert = gmp_invert("5", "11");echo gmp_strval(\$invert) . "\n";?>`

`9`

`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`