php产生随机数的两种方法实例代码输出随机IP-PHP教程-爱易网页

php产生随机数的两种方法实例代码输出随机IP

日期：2012-02-20　浏览次数：20442 次

本人是asp程序员，这是首次写php程序，一点心得发上来共享

复制代码代码如下:

		
<?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; 
?> 

例输出结果为 218.28.131.182
这个程序的特点是,生成的ip第一个字段时在指定范围内的，设定的几个是国内常见号段，也就是说生成的ip地址大部分是国内的
核心代码:

复制代码代码如下:

<?php 
$arr_1 = array("http://66.249.89.99","http://66.249.89.104","http://74.125.71.105"); 
$randarr= mt_rand(0,count($arr_1)-1); 
$gip= $arr_1[$randarr]; 
echo $gip."$randarr"; 
?>