Question

So I am working in PHP to convert a Steam Id, which many of you may be familiar with. I have the following steam ID:

STEAM_0:1:1514332

Now, I need to convert this to the 64 bit version, which is also the community ID. After browsing Steams official release on this here: http://developer.valvesoftware.com/wiki/SteamID and after also looking many places online, I have found the following method works for this:

Let X,Y, and Z be defined by the Steam ID: STEAM_X:Y:Z
SteamCommunityID = (Z*2) + 76561197960265728 + Y

So it works! However, where seems to be a mismatch between my ACTUAL community ID, and the one I am generating

Actual:        76561197963294393
PHP generated: 76561197963294000

When reversing the equasion, to get my steam id from the community id, I get: 1514335.5

Here is a simple example of the php in question:

//STEAM_0:1:1514332

$a = (1514332 * 2) + 76561197960265728 + 1;
echo $a; //76561197963294000

Am I doing something wrong?

Answer 1

PHP don’t have 64bit int on 32-bit binary. It is using floating point here. see how to have 64 bit integer on PHP?

The question include links to BC Math, which can be used for your problem.