分享下php生成随机数的三种方法,生成1-10之间的不重复随机数,php生成不重复随机数的例子,需要的朋友参考下。
如何用php生成1-10之间的不重复随机数?
例1,使用shuffle函数生成随机数。
- <?php
- $arr=range(1,10);
- shuffle($arr);
- foreach($arr as $values)
- {
- echo $values." ";
- }
- ?>
例2,使用array_unique函数生成随机数。
- <?php
- $arr=array();
- while(count($arr)<10)
- {
- $arr[]=rand(1,10);
- $arr=array_unique($arr);
- }
- echo implode(" ",$arr);
- ?>
例3,使用array_flip函数生成随机数,可以去掉重复值。
- <?php
- $arr=array();
- $count1=0;
- $count = 0;
- $return = array();
- while ($count < 10)
- {
- $return[] = mt_rand(1, 10);
- $return = array_flip(array_flip($return));
- $count = count($return);
- } //www.zzvips.com
- foreach($return as $value)
- {
- echo $value." ";
- }
- echo "<br/>";
- $arr=array_values($return);// 获得数组的值
- foreach($arr as $key)
- echo $key." ";
- ?>
本人是asp程序员,这是首次写php程序,一点心得发上来共享
- <?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:
- <?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";
- ?>