If we have an ip address as below:
127.0.0.1
Does both functions convert the ip address to the same number, or do they differ and have different result?
If we have an ip address as below: 127.0.0.1 Does both functions convert the
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If we have an ip address as below:
127.0.0.1
Does both functions convert the ip address to the same number, or do they differ and have different result?
They are almost exactly the same. ip2long sometimes returns a negative value because PHP uses signed numbers for valuation, while MySQL uses unsigned.
Both are evaluated as
x*(2^24) + y*(2^16) + z*(2^8) + w*(2^0), but in PHP, due to the long being signed, will show negative values for certain IP addresses.So, addresses while translate to over +2,147,483,647 will wrap around and give negative values.
This link describes this in detail.