Description:
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Documentation for http://www.php.net/ip2long explicitly states in Notes that 
"many IP addresses will result in negative integers". However, this isn't the 
case with 64-bit PHP, and I think this is important enough to be mentioned there. 
This isn't a problem with negative numbers, just with missing documentation.


The test script shows an example that will return a negative value on 32-bit, and 
non-negative on 64-bit PHP.

Test script:
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echo ip2long('192.0.0.0');