每次生成一个10位数的唯一ID [英] Generate a 10 digit unique id every time
问题描述
我正在编写脚本，基本上用户必须输入他的名字，选择文件，文件注释，如果需要并上传。
文件注释，名称，文件名将存储在数据库中使用auto_increment id。该文件也会上传到服务器。问题是我想生成一个10位数的唯一代码，这使用户可以轻松下载文件，他只需要输入10位数的代码，我的脚本就会将文件发送给他。
一切都很好，但问题是我无法生成10位唯一代码。安全性在这里并没有太多关注，只有id必须在每次失败时都是唯一的。由于脚本依赖于这个唯一的id来传递文件（在db中搜索这个唯一的id，从那里获取文件名并传递文件）。
我尝试了很多方法，但是不能保证id每次都是唯一的。
[PHP]< ;?
//设置随机id长度
$ random_id_length = 10;
//生成随机ID加密并将其存储在$ rnd_id中
$ rnd_id = crypt（uniqid（rand（），1））;
//删除可能出现的任何斜线
$ rnd_id = strip_tags（stripslashes（$ rnd_id））;
//删除任何。或/和翻转字符串
$ rnd_id = str_replace（"。"，""，$ rnd_id）;
$ rnd_id = strrev（str_replace（" /"，""，$ rnd_id））;
//最后我从$ rnd_id获取前10个字符
$ rnd_id = substr（$ rnd_id，0，$ random_id_length）;
echo" Random Id：$ rnd_id" ;;
？> [/ PHP]
上面的代码生成一个id，但我无法保证它的独特性。
如果它返回相同的ID怎么办？
有没有办法做到这一点？或者将auto_increment id从数据库转换为唯一id（加密）的任何函数，并在解密时产生相同的auto_increment id？
有什么方法吗？请帮帮我。
谢谢。
I am coding a script , where basically the user has to enter his name , choose file , file comments if required and upload.
The file comments , name , filename will be stored in the database with auto_increment id. The file gets uploaded to the server too. The problem is I want to generate a 10 digit unique code , which makes it simple for the user to download the file , he just has to enter the 10-digit code , and my script will deliver the file to him.
Everything is fine , but the problem is I am not able to generate the 10 digit unique code. Security is not focused much here , only the id has to be unique everytime WITHOUT FAIL. As the script depends on this unique id for delivering the file (searches the db for this unique id , gets the filename from there and delivers the file).
I have tried many ways , but cant assure the id will be unique everytime.
[PHP]<?
//set the random id length
$random_id_length = 10;
//generate a random id encrypt it and store it in $rnd_id
$rnd_id = crypt(uniqid(rand(),1));
//to remove any slashes that might have come
$rnd_id = strip_tags(stripslashes($rnd_id));
//Removing any . or / and reversing the string
$rnd_id = str_replace(".","",$rnd_id);
$rnd_id = strrev(str_replace("/","",$rnd_id));
//finally I take the first 10 characters from the $rnd_id
$rnd_id = substr($rnd_id,0,$random_id_length);
echo "Random Id: $rnd_id";
?>[/PHP]
The code above generates an id , but I am not able to assure its unique always.
What if it returns the same id ?
Is there a way to do this ? Or any function to convert the auto_increment id from the database to a unique id (encrypted) and result the same auto_increment id when decrypted ?
Any ways ? Please help me.
Thanks.
推荐答案
random_id_length = 10;
//生成随机ID加密并将其存储在
random_id_length = 10;
//generate a random id encrypt it and store it in
rnd_id
rnd_id
rnd_id = crypt （uniqid（RAND（），1））;
//删除可能出现的任何斜线
rnd_id = crypt(uniqid(rand(),1));
//to remove any slashes that might have come
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