如何使这个按位代码工作？

Question

bitwise operators only work on integers in PHP and the maximum size of an integer is 2^63 on 64bit servers. If I create a value greater than that it will cast my variable to a float and bitwise operators will stop functioning. I have the following example:

<?php

$CAN_DANCE = 2;

$CAN_SING = 4;

$CAN_PLAY = 8;

$CAN_BEGOD = pow(2,64);

$userperms =  $CAN_PLAY | $CAN_DANCE | $CAN_SING | $CAN_BEGOD;

if($userperms & $CAN_DANCE)
    echo 'This will work';

if($userperms & $CAN_BEGOD)
    echo 'This will not work';

?>

Naturally it will return true for the first check as thats less than 2^63 however for the latter I assign it to 2^64 which is too great for an integer and it incorrectly returns false. Is there any way to make it work for greater than 2^63? Otherwise I will only be able to use bitperms for upto 63 different items only.

Answer 1

Because this function return int, maybe you could you use the gmp_pow() function, and to calculate the rusults you can use the gmp_or() and for the if steatments you can use gmp_and()