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PHP | gmp_com() Function

Last Updated : 11 Jul, 2025
The gmp_com() is an inbuilt function in PHP which is used to calculate the one's complement of a GMP number(GNU Multiple Precision : For large numbers). Syntax:
gmp_com($num)
Parameters: This function accepts a GMP number $num as a mandatory parameter as shown in the above syntax. This parameter can be a GMP object in PHP version 5.6 and later, or we are also allowed to pass a numeric string provided that it is possible to convert that string to a number. Return Value: This function returns a GMP number which is the one's complement of a GMP number passed to it as parameter. Examples:
Input : gmp_com("1235")
Output : -1236

Input : gmp_com("1234")
Output : -1235
Below programs illustrate the gmp_com() function in PHP : Program 1: Program to calculate the one's complement of a GMP number when numeric strings as GMP numbers are passed as arguments. Output:
-1346
Program 2: Program to calculate the one's complement of a GMP number when GMP number is passed as argument. Output:
-133
Reference: https://www.php.net/manual/en/function.gmp-com.php
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