allowing IP from specific country

<?php
function filter($IP) {

$remote=popen(" curl  -Ss ipinfo.io/$IP  | awk '{print $2}'  | awk 'NR==6'");
if($remote==USA){

echo " Welcome";
}


else  {

echo "You cant access to this website";

exit();

}

}

filter($_SERVER['REMOTE_ADDR']);
?>

$country = file_get_contents("http://ipinfo.io/{$_SERVER['REMOTE_ADDR']}/country");
if($country != "RO") {
    // User isn't in Romania! 
    // Display an error message, or redirect to another website
}

http://stackoverflow.com/questions/8384421/restrict-website-to-access-specific-country

http://ipinfo.io/213.140.32.1/country

note if you use system() function instead of popen() the command output will be displayed on the browser. this is useful  for debugging popurses