第六期：获取国内随机IP地址

<?php

/**
 * 获取国内随机IP地址
 * 注：适用于32位操作系统
 */
function rand_ip(){
        $ip_long = array(
            array('607649792', '608174079'), //36.56.0.0-36.63.255.255
            array('1038614528', '1039007743'), //61.232.0.0-61.237.255.255
            array('1783627776', '1784676351'), //106.80.0.0-106.95.255.255
            array('2035023872', '2035154943'), //121.76.0.0-121.77.255.255
            array('2078801920', '2079064063'), //123.232.0.0-123.235.255.255
            array('-1950089216', '-1948778497'), //139.196.0.0-139.215.255.255
            array('-1425539072', '-1425014785'), //171.8.0.0-171.15.255.255
            array('-1236271104', '-1235419137'), //182.80.0.0-182.92.255.255
            array('-770113536', '-768606209'), //210.25.0.0-210.47.255.255
            array('-569376768', '-564133889'), //222.16.0.0-222.95.255.255
        );
        $rand_key = mt_rand(0, 9);
        $ip       = long2ip(mt_rand($ip_long[$rand_key][0], $ip_long[$rand_key][1]));
        return $ip;
}