Get Public IP Address

get_public_ip_address.php

<?php
/**
 * Get Public IP Address
 * Get the Public IP address of the client.
 *
 * @link   http://stackoverflow.com/a/2031935/1743124
 * 
 * @return string The IP Address.
 */
function get_public_ip_address(){
    foreach (array('HTTP_CLIENT_IP', 'HTTP_X_FORWARDED_FOR', 'HTTP_X_FORWARDED', 'HTTP_X_CLUSTER_CLIENT_IP', 'HTTP_FORWARDED_FOR', 'HTTP_FORWARDED', 'REMOTE_ADDR') as $key){
        if (array_key_exists($key, $_SERVER) === true){
            foreach (explode(',', $_SERVER[$key]) as $ip){
                $ip = trim($ip); // just to be safe

                if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) !== false){
                    return $ip;
                }
            }
        }
    }
}

/**
 * IP Clearance
 * Make a clearance for IP addresses.
 * 
 * @return boolean Clearance true, if not within the range.
 */
function clear_from_blocked_ips() {
	$ip_address 	= get_public_ip_address();
	$blocked_ips  = array(
						'337.537.112.181',
						'258.10.520.12'
					);

	if( in_array( $ip_address, $blocked_ips ) )
		return false;
	else
		return true;
}