[PHP] Get IP adress of the visitor

[PHP] Get IP adress of the visitor

<?php 
/**
 * Ensures an ip address is both a valid IP and does not fall within
 * a private network range.
 */
function validate_ip($ip)
{
    if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false) {
	return false;
    }
    return true;
}
/**
 * To return the Ip Adress
 */
 function get_ip_address() {
    $ip_keys = array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR');
    foreach ($ip_keys as $key) {
	if (array_key_exists($key, $_SERVER) === true) {
	    foreach (explode(',', $_SERVER[$key]) as $ip) {
		// trim for safety measures
		$ip = trim($ip);
		// attempt to validate IP
		if (validate_ip($ip)) {
		    return $ip;
		}
	    }
	}
    }
    return isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : false;
}
  ?>