php获取随机字符串的几种方法

 1 /** 2 ?* 获得随机字符串 3 ?* @param $len ????????????需要的长度 4 ?* @param $special ???????是否需要特殊符号 5 ?* @return string ??????返回随机字符串 6 ?*/ 7 function getRandomStr($len, $special=true){ 8 ????$chars = array( 9 ????????"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k",10 ????????"l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v",11 ????????"w", "x", "y", "z", "A", "B", "C", "D", "E", "F", "G",12 ????????"H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R",13 ????????"S", "T", "U", "V", "W", "X", "Y", "Z", "0", "1", "2",14 ????????"3", "4", "5", "6", "7", "8", "9"15 ????);16 17 ????if($special){18 ????????$chars = array_merge($chars, array(19 ????????????"!", "@", "#", "$", "?", "|", "{", "/", ":", ";",20 ????????????"%", "^", "&", "*", "(", ")", "-", "_", "[", "]",21 ????????????"}", "<", ">", "~", "+", "=", ",", "."22 ????????));23 ????}24 25 ????$charsLen = count($chars) - 1;26 ????shuffle($chars); ???????????????????????????//打乱数组顺序27 ????$str = ‘‘;28 ????for($i=0; $i<$len; $i++){29 ????????$str .= $chars[mt_rand(0, $charsLen)]; ???//随机取出一位30 ????}31 ????return $str;32 }

1 //取随机10位字符串2 $strs="QWERTYUIOPASDFGHJKLZXCVBNM1234567890qwertyuiopasdfghjklzxcvbnm";3 $name=substr(str_shuffle($strs),mt_rand(0,strlen($strs)-11),10);4 echo $name;

$uniqid = md5(uniqid(microtime(true),true));//microtime(true) ?返回系统当前时间戳的毫秒数

 1 /** 2 ?????* 方法一：获取随机字符串 3 ?????* @param number $length 长度 4 ?????* @param string $type 类型 5 ?????* @param number $convert 转换大小写 6 ?????* @return string 随机字符串 7 ?????*/ 8 ????function random($length = 6, $type = ‘string‘, $convert = 0) 9 ????{10 ????????$config = array(11 ????????????‘number‘ => ‘1234567890‘,12 ????????????‘letter‘ => ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ‘,13 ????????????‘string‘ => ‘abcdefghjkmnpqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ23456789‘,14 ????????????‘all‘ => ‘abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890‘15 ????????);16 ?17 ????????if (!isset($config[$type]))18 ????????????$type = ‘string‘;19 ????????$string = $config[$type];20 ?21 ????????$code = ‘‘;22 ????????$strlen = strlen($string) - 1;23 ????????for ($i = 0; $i < $length; $i++) {24 ????????????$code .= $string{mt_rand(0, $strlen)};25 ????????}26 ????????if (!empty($convert)) {27 ????????????$code = ($convert > 0) ? strtoupper($code) : strtolower($code);28 ????????}29 ????????return $code;30 ????}31 ?32 ????/**33 ?????* 方法二：获取随机字符串34 ?????* @param int $randLength 长度35 ?????* @param int $addtime 是否加入当前时间戳36 ?????* @param int $includenumber 是否包含数字37 ?????* @return string38 ?????*/39 ????function rand_str($randLength = 6, $addtime = 1, $includenumber = 0)40 ????{41 ????????if ($includenumber) {42 ????????????$chars = ‘abcdefghijklmnopqrstuvwxyzABCDEFGHJKLMNPQEST123456789‘;43 ????????} else {44 ????????????$chars = ‘abcdefghijklmnopqrstuvwxyz‘;45 ????????}46 ????????$len = strlen($chars);47 ????????$randStr = ‘‘;48 ????????for ($i = 0; $i < $randLength; $i++) {49 ????????????$randStr .= $chars[mt_rand(0, $len - 1)];50 ????????}51 ????????$tokenvalue = $randStr;52 ????????if ($addtime) {53 ????????????$tokenvalue = $randStr . time();54 ????????}55 ????????return $tokenvalue;56 ????}