获取客户端ip

<?php
namespace EoffcnUtil;
class Network {
    /**
     * 获取ip
     * @return string
     */
    public static function getIP() {
        $ip = false;
        if (!empty ($_SERVER ["HTTP_CLIENT_IP"])) {
            $ip = $_SERVER ["HTTP_CLIENT_IP"];
        }
        if (!empty ($_SERVER ['HTTP_X_FORWARDED_FOR'])) {
            $ips = explode(", ", $_SERVER ['HTTP_X_FORWARDED_FOR']);
            if ($ip) {
                array_unshift($ips, $ip);
                $ip = FALSE;
            }
            for ($i = 0; $i < count($ips); $i++) {
                if (!preg_match("/^(10|172.16|192.168)./i", $ips [$i])) {
                    $ip = $ips [$i];
                    break;
                }
            }
        }
        return ($ip ? $ip : $_SERVER ['REMOTE_ADDR']);
    }

    /**
     * 获得当前的url
     * @return string
     */
    public static function getCurrentURL() {
        $scheme = 'http';
        if (self::usingHTTPS()) {
            $scheme .= 's';
        }

        return sprintf('%s://%s%s', $scheme, $_SERVER['HTTP_HOST'], $_SERVER['REQUEST_URI']);
    }

    /**
     * 获得当前的域名
     * @return string
     */
    public static function getCurrentDomain() {
        return isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
    }

    /**
     * 是否使用https
     * @return bool
     */
    public static function usingHTTPS() {
        if (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') {
            return true;
        } elseif (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || !empty($_SERVER['HTTP_X_FORWARDED_SSL']) && $_SERVER['HTTP_X_FORWARDED_SSL'] == 'on') {
            return true;
        }
        return false;
    }
}