#### History of Idiom 74 > diff from v21 to v22

Edit summary for version 22 :

New PHP implementation by user [ricardo_sdl]

New PHP implementation by user [ricardo_sdl]

↷

#### Version 21

2017-02-07, 22:11:30

#### Version 22

2018-08-22, 20:35:46

# Idiom #74 Compute GCD

Compute the greatest common divisor x of big integers a and b. Use an integer type able to handle huge numbers.

# Idiom #74 Compute GCD

Compute the greatest common divisor x of big integers a and b. Use an integer type able to handle huge numbers.

##### Imports

extension=gmp

##### Code

$x = gmp_gcd($a, $b);

##### Comments bubble

both $a and $b must be instances of the GMP class