PHP Manual: Calculates one's complement

GMP gmp_com(GMPintstring $num)

Returns the one's complement of num.

num: A GMP object, an int, or a string that can be interpreted as a number following the same logic as if the string was used in gmp_init with automatic base detection (i.e. when base is equal to 0).

Returns the one's complement of num, as a GMP number.

Example #1 gmp_com example

<?php
$com = gmp_com("1234");
echo gmp_strval($com) . "\n";
?>

The above example will output:

-1235