gmp_gcd

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

gmp_gcd — Calculate GCD

Description

gmp_gcd(GMP|int|string $num1, GMP|int|string $num2): GMP

Calculate greatest common divisor of num1 and num2. The result is always positive even if either of, or both, input operands are negative.

Parameters

num1
A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).
num2
A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init() with automatic base detection (i.e. when base is equal to 0).

Return Values

A positive GMP number that divides into both num1 and num2.

Examples

Example #1 gmp_gcd() example

<?php
$gcd = gmp_gcd("12", "21");
echo gmp_strval($gcd) . "\n";
?>

The above example will output:

3

See Also