How do I check if a users input is a valid IP address or not?

Question

I want to check if an entered input is a valid IP address or not. I would like a specific function that will help me validate a users input.

Answer 1

filter_var($ip, FILTER_VALIDATE_IP) 

http://www.php.net/filter_var

Example:-

if(filter_var($ip, FILTER_VALIDATE_IP)){   echo 'Valid IP'; } else {   echo 'Not Valid IP'; }