时间:2021-07-01 10:21:17 帮助过:23人阅读
可以指定生成的字符串长度,代码如下:
- function rand_str($length, $max=FALSE)
- {
- if (is_int($max) && $max > $length)
- {
- $length = mt_rand($length, $max);
- }
- $output = '';
- for ($i=0; $i<$length; $i++)
- {
- $which = mt_rand(0,2);
- if ($which === 0)
- {
- $output .= mt_rand(0,9);
- }
- elseif ($which === 1)
- {
- $output .= chr(mt_rand(65,90));
- }
- else
- {
- $output .= chr(mt_rand(97,122));
- }
- }
- return $output;
- }
调用实例:$randstr = rand_str(16);
生成随机字符串的函数,代码如下:
- <?php
- /**
- * 产生随机字符串
- *
- * 产生一个指定长度的随机字符串,并返回给用户
- *
- * @access public
- * @param int $len 产生字符串的位数
- * @return string
- */
- function randStr($len=6) {
- $chars='ABDEFGHJKLMNPQRSTVWXYabdefghijkmnpqrstvwxy23456789#%*'; // characters to build the password from
- mt_srand((double)microtime()*1000000*getmypid()); // seed the random number generater (must be done)
- $password='';
- while(strlen($password)<$len)
- $password.=substr($chars,(mt_rand()%strlen($chars)),1);
- return $password;
- }
- ?>
创建字符池.
- function randomkeys($length)
- {
- $pattern = '1234567890abcdefghijklmnopqrstuvwxyz
- ABCDEFGHIJKLOMNOPQRSTUVWXYZ,./&l
- t;>?;#:@~[]{}-_=+)(*&^%$?!'; //字符池
- for($i=0; $i<$length; $i++)
- {
- $key .= $pattern{mt_rand(0,35)}; //生成php随机数
- }
- return $key;
- }
- echo randomkeys(8);
无需创建字符池
- function randomkeys($length)
- {
- $output='';
- for ($a = 0; $a < $length; $a++) {
- $output .= chr(mt_rand(35, 126)); //生成php随机数
- }
- return $output;
- }
- echo randomkeys(8);
随机用户名和随机密码例子:
- //随机生成用户名(长度6-13)
- function create_password($pw_length = 4){
- $randpwd = '';
- for ($i = 0; $i < $pw_length; $i++){
- $randpwd .= chr(mt_rand(33, 126));
- }
- return $randpwd;
- }
- function generate_username( $length = 6 ) {
- // 密码字符集,可任意添加你需要的字符
- $chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()-_ []{}<>~`+=,.;:/?|';
- $password = '';
- for ( $i = 0; $i < $length; $i++ )
- {
- // 这里提供两种字符获取方式
- // 第一种是使用substr 截取$chars中的任意一位字符;
- // 第二种是取字符数组$chars 的任意元素
- // $password .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
- $password .= $chars[ mt_rand(0, strlen($chars) - 1) ];
- }
- return $password;
- }
- //调用
- $userId = 'user'.generate_username(6);
- $pwd = create_password(9);
以上就是php自定义函数生成随机密码实例详解的详细内容,更多请关注Gxl网其它相关文章!