如何从IP地址获取最后一位？

Question

Does anyone know how can I get the last digit number from the Ip address in php?

example:

$ip = '200.0.0.12';

How can I get only 12 from the IP address instead of 200.0.0.12?

Answer 1

假设ip格式正确（没有端口，ipv4等）

$last_digit = array_pop(explode('.', $ip))

Answer 2

I like Mike B's answer, but here's a possible alternative: use strrchr and substr :

$ip = '200.0.0.12';
echo substr(strrchr($ip,'.'),1);

One advantage: it's supposed to be (a little) faster then Mike B's answer.

In my (very unscientific) timings i got an average runtime of 1.3562 seconds (500.000 iterations) versus 1.6590 seconds for the array_pop / explode version.

Answer 3

My alternative. By this way you get last digit in number type, not in string

$ip = '200.0.0.12';
echo ip2long($ip) % 256;