邀请码实现(附PHP、GO、Java实例)

2019-11-21 13:19:25 Albin Wong 4958

有的论坛、邮箱、博客，在注册时需要一种特殊的通行证——即邀请码（全称：邀请注册码），邀请码相当于你用一个软件要输入注册码一样，它和现实生活中的请柬是一个作用，只有收到邀请码，才能注册帐号。当论坛开启邀请注册后，邀请码成为注册论坛的必要条件，要想注册一个ID，就必须获得一个有效的邀请码，这时普通注册功能一般暂停。

目前很多APP都会为每一个用户生成一个邀请码，用以激励用户邀请其他人下载注册。例如Uber邀请码、数字货币交易所邀请码等等。

邀请码大多以5位或者6位数字和字母的组合，每一个用户固定一个邀请码且唯一。且邀请码没有特定的规律，看上去是随机生成的。

通过预先随机生成一定数量数字和字母组合的指定位数的唯一的邀请码，存放在数据库中，新用户注册时取一个邀请码，并保存这个绑定关系。当原有邀请码快用完时再生成一批，每次生成随机字符串都需要去数据库中检索是否存在。当用户基数越来越庞大时，势必会影响效率。

如要生成6位的邀请码，以0-9十个数字，加上24个大写字母（除去O、I两个易混淆字母）的组合。24个大写字母和10个数字0-9进行排列组合，共可生成邀请码346=1,544,804,416个。15亿+个邀请码，而用户量一般很难达到15亿。

一般用户ID都是一个长整型数，ID都是递增分配的。所以如何将一个长整形ID映射到一个6位的base34编码中。因为6位base34最多能映射15亿个编码，而用户量一般很少能达到15亿量级。假设用户ID都小于1,544,804,416。

实现以上方法实质上就是将10进制转成34进制,详见代码:

### PHP实例

```php
function createCode($userId)
{
    $baseStrLists = ['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z'];
    $num = $userId;
    $code = '';
    while ($num) {
        $mod = $num % count($baseStrLists);
        $num = (int)($num / count($baseStrLists));
        $code = "{$baseStrLists[$mod]}{$code}";
    }

//判断code的长度  
 if (strlen($code) < 6) {
 return str_pad($code, 6, '0', STR_PAD_LEFT);
 }
 return $code;
}
echo createCode(896); //0000SC
echo createCode(334412); //008H9N
echo createCode(1468641539); //YB075D
```

### Go实例

```go
package main
 
import(
    "fmt"
    "container/list"
)
 
var baseStrLists string = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ"
var base [] byte = []byte(baseStrLists)

func createCode(n uint64)([]byte){
 quotient := n
 mod := uint64(0)
 l := list.New()
 for quotient != 0 {
 mod = quotient%len(tip1)
 quotient = quotient/len(tip1)
 l.PushFront(base[int(mod)])
 }
 listLen := l.Len()
 if listLen >= 6 {
 res := make([]byte, 0, listLen)
 for i := l.Front(); i != nil ; i = i.Next(){
 res = append(res, i.Value.(byte))
 }
 } else {
 res := make([]byte, 0, 6)
 for i := 0; i < 6; i++ {
 if i < 6-listLen {
 res = append(res, base[0])
 } else {
 res = append(res, l.Front().Value.(byte))
 l.Remove(l.Front())
 }
 
 }
 }
 return res
}

func main(){
    res := createCode(896)
    fmt.Println("896:", string(res)) // 334: 0000SC

res = createCode(334412)
    fmt.Println("334412:", string(res)) // 334412: 008H9N

res = createCode(1468641539)
    fmt.Println("1468641539:", string(res)) // 1468641539: YB075D
}

```

### Java 实例

```java
package IO;
import java.util.*;
import java.io.*;

class Untitled {
 public static void main(String[] args) {
 String rehe = encode(896); 
 System.out.println(rehe); // 0000SC
 
 String lizhi = encode(334412);
 System.out.println(lizhi); // 008H9N
 
 String pk = encode(1468641539);
 System.out.println(pk); // YB075D
 }
 
 public static String encode(int uid) {
 char[] baseStrLists = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9','A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J', 'K','L', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
 int maxNum = baseStr.length;
 String pwd = "";
 
 while(uid != 0){
 int mod = uid % maxNum;
 uid = uid / maxNum;
 pwd = baseStrLists[mod]+ pwd;
 }
 
 while (pwd.length() < 6) {
 pwd = "0" + pwd;
 }
 
 return pwd;
 }
}
```

baseStrLists数据可以随机打乱字符的顺序，让产生的验证码也随机一些。这样写的好处在于他人不知道你进制的顺序，所以也很难从邀请码反推出用户ID。
当用户ID大于1,544,804,416的时候，怎么办？
- 生成7位或者更多位邀请码
- 实在是只能6位，那么增加baseStrLists数量，比如将小写字母加进来.

(3) Comments

John Doe- Reply

February 26, 2013 at 1:18 pm
- saqib sarwar- Reply
  
  February 26, 2013 at 1:20 pm
  
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John Doe- Reply

February 26, 2013 at 1:27 pm

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邀请码实现(附PHP、GO、Java实例)

(3) Comments

John Doe- Reply

saqib sarwar- Reply

John Doe- Reply

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