Home > Article > PHP Framework > How Laravel generates a four-digit unique invitation code based on user ID
The following tutorial column will introduce to you how Laravel generates a four-digit unique invitation code based on the user ID. I hope it will be helpful to friends in need! Create a new file app/Services/InviteCodeService.php
<?php namespace App\Services;// 邀请码服务class InviteCodeService{ protected $key,$num; public function __construct() { $this->key = 'abcdefghjkmnpqrstuvwxyz123456789'; // 注意这个key里面不能出现数字0 否则当 求模=0 会重复的 // 多少进制 $this->num = strlen($this->key); } // 传递用户id生成唯一邀请码 public function enCode(int $user_id) { $code = ''; // 邀请码 while ($user_id > 0) { // 转进制 $mod = $user_id % $this->num; // 求模 $user_id = ($user_id - $mod) / $this->num; $code = $this->key[$mod] . $code; } $code = str_pad($code, 4, '0', STR_PAD_LEFT); // 不足用0补充 return $code; } // 邀请码获取用户id 一般都不需要用到 function deCode($code) { if (strrpos($code, '0') !== false) $code = substr($code, strrpos($code, '0') + 1); $len = strlen($code); $code = strrev($code); $user_id = 0; for ($i = 0; $i key, $code[$i]) * pow($this->num, $i); return $user_id; }}
Editapp/Providers/AppServiceProvider.php
use App\Services\InviteCodeService; public function register() { $this->app->singleton('invite_code',InviteCodeService::class); }
Test uniqueness
$max_num = 200000; $codes = []; for ($i = 1; $i enCode($i); $i = 1; foreach ($codes as $code){ $userId = app('invite_code')->deCode($code); // 邀请码获取用户id if( $userId != $i) dd("邀请码解密错误".$i); $i++; } $unique_count = count(array_unique($codes)); dd($unique_count); // 不重复的总数
20w There is no duplication of data, and the invitation code solution
user id is also correct. Note
$this->key
There cannot be duplicate strings. For example: c
Repeat.
##About $this->key// $this->key = 'abcdefghjkmnpqrstuvwxyz123456789'; // 没打乱的$this->key = 'kh8sjpdazetnmb5yw7rq4gc9fuv3216x'; // 打乱的
$this->key
There is no limit to the length, but it is best not to be too short.
user id is 4 to the third power (256)
What will happen if it exceeds 256? The invitation code becomes only 5 digits... , not good-looking. For user experience, don’t add
i
$this->key
These letters are easy to confuse users. i
:
l
l :
1
o :
0 (Of course
0
cannot appear) is very similar.
Ps
Example
Assume
For example:
User ID
255
4-digit invitation code.256
The invitation code is 5 digits. 500
The invitation code is 5 digits.
......(So if there is a limit on the number of invitation codes, you will know what to do if you are smart)
What is the maximum user ID with a 4-digit hexadecimal invitation code?
BullshitBecause I wanted to use the invitation code function, my first reaction was:
The above is the detailed content of How Laravel generates a four-digit unique invitation code based on user ID. For more information, please follow other related articles on the PHP Chinese website!