php产生随机数的两种方法实例代码 输出随机IP

　　<?php

　　$ip2id= round(rand(600000, 2550000) / 10000); //第一种方法，直接生成

　　$ip3id= round(rand(600000, 2550000) / 10000);

　　$ip4id= round(rand(600000, 2550000) / 10000);

　　//下面是第二种方法，在以下数据中随机抽取

　　$arr_1 = array("218","218","66","66","218","218","60","60","202","204","66","66","66","59","61","60","222","221","66","59","60","60","66","218","218","62","63","64","66","66","122","211");

　　$randarr= mt_rand(0,count($arr_1)-1);

　　$ip1id = $arr_1[$randarr];

　　echo $ip1id;

　　echo ".";

　　echo $ip2id;

　　echo ".";

　　echo $ip3id;

　　echo ".";

　　echo $ip4id;

　　?>