(PHP 4 >= 4.0.4, PHP 5, PHP 7)
Calculate GCD
GMP gmp_gcd ( GMP $a, GMP $b )
Calculate greatest common divisor of a and b. The result is always positive even if either of, or both, input operands are negative.
Parameters:
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.
Returns:
A positive GMP number that divides into both a and b.
Examples:
gmp_gcd() example
<?php
$gcd = gmp_gcd("12", "21");
echo gmp_strval($gcd) . "\n";
?>
The above example will output:
3
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