PHP GMP gmp_com() Function

As of my last update in September 2021, PHP’s GMP (GNU Multiple Precision) extension does not include a built-in gmp_com() function. It appears there might be a typographical error in the function name.

However, if you meant the bitwise complement operation (bitwise NOT) for a GMP number, you can achieve it using the gmp_com() function (bitwise NOT) or the bitwise XOR operator (^).

1. Using gmp_com() function (bitwise NOT):

Here’s the syntax for the gmp_com() function:

GMP gmp_com ( GMP $num )

Example:

$number = gmp_init('5'); // Binary: 101

$complement = gmp_com($number);

echo "Bitwise complement of 5 is: " . gmp_strval($complement); // Output: -6 (Binary: 1111111111111111111111111111111111111111111111111111111111111010)

In this example, the gmp_com() function is used to perform a bitwise NOT operation on the GMP number 5. The result is -6, which represents the binary value 1111111111111111111111111111111111111111111111111111111111111010.

2. Using bitwise XOR operator (^):

Example:

$number = gmp_init('5'); // Binary: 101

$complement = $number ^ -1;

echo "Bitwise complement of 5 is: " . gmp_strval($complement); // Output: -6 (Binary: 1111111111111111111111111111111111111111111111111111111111111010)

Both methods will give the same result, which is the bitwise NOT of the input GMP number.

Please note that the GMP extension needs to be enabled in your PHP configuration to use GMP functions. Additionally, always refer to the PHP manual for the specific version you are using, as the availability of functions may change in newer PHP versions.