PHP | gmp_cmp() Function (original) (raw)

Last Updated : 11 Jul, 2025

The gmp_cmp() is an inbuilt function in PHP which is used to compare two GMP numbers(GNU Multiple Precision : For large numbers).Syntax:

gmp_cmp($num1, $num2)

Parameters: This function accepts two GMP numbers $num1 and $num2 as mandatory parameters as shown in the above syntax for comparing. These parameters can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass numeric strings such that it is possible to convert those strings in numbers.Return Value: The function returns "1" if num1>num1 > num1>num2, "0" if num1equaltonum1 equal to num1equaltonum2, "-1" if num1<num1 < num1<num2. Examples:

Input : gmp_cmp("1234", "1236") Output : -1

Input : gmp_cmp("3569", "3569") Output : 0

Below programs illustrate the gmp_cmp() function in PHP:Program 1: Program to compare the two GMP numbers when they are passed as numeric strings.

php `

`

Output:

0

Program 2: Program to compare two GMP numbers when they are passed as GMP numbers as arguments.

php `

`

Output:

-1

Reference: https://www.php.net/manual/en/function.gmp-cmp.php