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';
}