php判断IP地址是否在多个IP段内

IP.class.php

<?php

class Ip {
    /**
     * 取IP
     * @return string
     */
    public static function get() {
        if ($_SERVER['HTTP_CLIENT_IP'] && $_SERVER['HTTP_CLIENT_IP']!='unknown') {
                $ip = $_SERVER['HTTP_CLIENT_IP'];
            } elseif ($_SERVER['HTTP_X_FORWARDED_FOR'] && $_SERVER['HTTP_X_FORWARDED_FOR']!='unknown') {
                $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
            } else {
                $ip = $_SERVER['REMOTE_ADDR'];
            }
            return $ip;
    }

    /**
     * IP转成整形数值
     * @param string $ip IP
     * @return int
     */
    public static function ipToInt($ip) {
        $ips = explode('.',$ip);
        if (count($ips)==4) {
            $int = $ips[0]*256*256*256+$ips[1]*256*256+$ips[2]*256+$ips[3];  //根据IP,a,b,c类进行计算
        } else {
            //throw new Exception('ip is error');
            Tool::Alert('IP地址存在错误...');  //一个工具类，弹出