php生成随机数的三种方法

WBOY
Release: 2016-06-20 13:01:15
Original
1395 people have browsed it

php生成随机数的三种方法

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." ";
}
?>
Copy after login

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);
?>
Copy after login

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.jb51.net
foreach($return as $value)
 {
  echo $value." ";
 }
echo "<br/>";
$arr=array_values($return);// 获得数组的值 
foreach($arr as $key)
echo $key." ";
?>
Copy after login

php随机数生成函数示例

<?php function randpw($len=8,$format='ALL'){
$is_abc = $is_numer = 0;
$password = $tmp ='';  
switch($format){
case 'ALL':
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
break;
case 'CHAR':
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
break;
case 'NUMBER':
$chars='0123456789';
break;
default :
$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
break;
}
mt_srand((double)microtime()*1000000*getmypid());
while(strlen($password)<$len){
$tmp =substr($chars,(mt_rand()%strlen($chars)),1);
if(($is_numer <> 1 && is_numeric($tmp) && $tmp > 0 )|| $format == 'CHAR'){
$is_numer = 1;
}
if(($is_abc  1 && preg_match('/[a-zA-Z]/',$tmp)) || $format == 'NUMBER'){
$is_abc = 1;
}
$password.= $tmp;
}
if($is_numer  1 || $is_abc  1 || empty($password) ){
$password = randpw($len,$format);
}
return $password;
}
for($i = 0 ; $i ";
}
Copy after login


Related labels:
php
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template