PHP Manual: Bitwise OR

GMP gmp_or ( GMP $a , GMP $b )

Calculates bitwise inclusive OR of two GMP numbers.

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.

A GMP number resource in PHP 5.5 and earlier, or a GMP object in PHP 5.6 and later.

Example #1 gmp_or example


<?php
$or1 = gmp_or("0xfffffff2", "4");
echo gmp_strval($or1, 16) . "\n";
$or2 = gmp_or("0xfffffff2", "2");
echo gmp_strval($or2, 16) . "\n";
?>

The above example will output:

fffffff6
fffffff2