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This may not be the right place for this question, please point me at the correct SE site if not.

The PHP Documentation for the function ip2long states:

Note

Because PHP's integer type is signed, many IP addresses will result in negative integers on 32-bit architectures

Which is fine, however I am little confused if the version of PHP makes a difference?

I am running 64bit Server 2008 with 32bit PHP installed, and I am getting negative integers with some IP addresses. I am clearly running on a 64bit architecture, so this shouldn't be the case according to the (admittedly very vague) documention.

I can only assume that it's because I am running 32bit PHP?? But I can't confirm this anywhere.

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superphonic
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You are correct that it is because you are running a 32-bit build of PHP. Since it is compiled as a 32-bit application, despite running on a 64-bit system you still do not get 64-bit integers.

It should also be noted that at the time of writing 64-bit builds of PHP on Windows do not provide 64-bit integers (or large file support) so even if you go with a 64-bit version you will still experience integer overflow.

You can try using sprintf with the %u format to try to get a string representation of the 64-bit number. I used this code with older PHP4 applications running on 32-bit where I wanted to print out a 64-bit integer. Note that it may not be suitable if you need to do anything other than output the 64-bit number.

$string = sprintf('%u', $someBigInteger);
drew010
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    Thanks for confirming this for me. using `sprintf('%u', $someBigInteger);` does solve my issue and the resulting integer can still be converted back to a dotted IP address using long2ip. – superphonic Apr 01 '14 at 09:03