32 bit unsigned int php

Does anyone know of a class/library/e开发者_如何学运维tc. that can simulate 32 bit unsigned integers on a 32 bit platform in PHP? I'm porting a C lib into PHP and it uses a lot of integers that are greater than the maximum for 32 bit signed int.

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Try the BC Math Library, which "supports numbers of any size and precision, represented as strings."

Good luck!

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Why can't you write

  modulo(a+b,2^32)

or its PHP equivalent for a, b being "unsigned" integers you are trying to "unsigned integer add", similarly for subtract, multiply, divide, ...? You can of course hide this in a function add_unsigned to make the code a bit clearer.

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Do you really need it? php will convert to float if you go out of bounds of an int.

http://www.php.net/manual/en/language.types.integer.php

var_dump(PHP_INT_MAX);
$int = PHP_INT_MAX;
var_dump($int + $int);