(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_gcd — Calculate GCD
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.
A positive GMP number that divides into both num1 and num2.
Example #1 gmp_gcd() example
<?php
$gcd = gmp_gcd("12", "21");
echo gmp_strval($gcd) . "\n";
?> The above example will output:
3
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https://www.php.net/manual/en/function.gmp-gcd.php