How to limit the IP address range in php_PHP tutorial

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function get_real_ipaddress() {

if (!empty($_SERVER['HTTP_CLIENT_IP'])) {

return $_SERVER['HTTP_CLIENT_IP'];

} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {

return $_SERVER['HTTP_X_FORWARDED_FOR'];

}

return $_SERVER['REMOTE_ADDR'];

}

function in_ip_range($ip, $ip_one, $ip_two = false) {

if(!$ip_two) {

return $ip_one === $ip;

}

return ip2long($ip_one) * -1 >= ip2long($ip) * -1 && ip2long($ip_two) * -1 <= ip2long($ip) * -1;

}

function validate_ip() {

$ip = explode(':', get_real_ipaddress());

$ip = $ip[0];

if(in_ip_range($ip, '212.76.229.115', '212.76.229.120')) {

return true;

} else if(in_ip_range($ip, '194.78.4.66', '194.78.4.79')) {

return true;

} else if(in_ip_range($ip, '194.8.4.78', '194.8.4.78')) {

return true;

} else if(in_ip_range($ip, '0', '1')) { // local

return true;

}

header('Location: http://www.bkjia.net');

}