PHP method to create a unique number class based on an auto-incremented ID

This article mainly introduces the relevant knowledge of PHP to create a unique number class based on the self-increasing ID. Has very good reference value. Let’s take a look with the editor below

During the development process, our data tables generally use self-increasing numbers as the primary key of id, and id is a numeric type, which is not easy to understand. After we convert the ID into a number according to a certain format, it is easy to know what the content represents based on the number.

For example, the order table id=20160111197681234, just looking at the id we don’t know that this id is the id of the order table, but it is converted to the number O-20160111197681234, it is easy to see that it is a record of the order table, and then it can be searched in the order table based on the id.

Number creation rules

1. The unique

is generated using an auto-incremented id, guaranteed Uniqueness

2. As short as possible

can be processed by using the remainder of the number and the corresponding letter to create a shorter number

Algorithm principle

1. Add a custom prefix to identify

2. The format is composed of prefix + letters + numbers. Only N digits are reserved for numbers. If there are more than 10 digits, use the remainder method of numbers and use letters to correspond.

For example:

id =1

Prefix=F

The number retains 3 digits

The number created is: F-A-001

The code is as follows:

IDCode.class.PHP

##

<?php
/**
 * php 根据自增id创建唯一编号类
 * Date:  2016-11-27
 * Author: fdipzone
 * Ver:   1.0
 *
 * Func
 * Public create 创建编号
 */
class IDCode{ // class start
  /**
   * 创建编号
   * @param Int  $id     自增id
   * @param Int  $num_length 数字最大位数
   * @param String $prefix   前缀
   * @return String
   */
  public static function create($id, $num_length, $prefix){
    // 基数
    $base = pow(10, $num_length);
    // 生成字母部分
    $pision = (int)($id/$base);
    $word = &#39;&#39;;
    while($pision){
      $tmp = fmod($pision, 26); // 只使用26个大写字母
      $tmp = chr($tmp + 65);   // 转为字母
      $word .= $tmp;
      $pision = floor($pision/26);
    }
    if($word==&#39;&#39;){
      $word = chr(65);
    }
    // 生成数字部分
    $mod = $id % $base;
    $digital = str_pad($mod, $num_length, 0, STR_PAD_LEFT);
    $code = sprintf(&#39;%s-%s-%s&#39;, $prefix, $word, $digital);
    return $code;
  }
} // class end
?>

demo.php

<?php
require &#39;IDCode.class.php&#39;;
$test_ids = array(1,9,10,99,100,999,1000,1009,2099,3999,9999,14999,99999);
foreach($test_ids as $test_id){
  echo $test_id.&#39; = &#39;.IDCode::create($test_id, 3, &#39;F&#39;).&#39;<br>&#39;;
}
?>

Output:

1 = F-A-001
9 = F-A-009
10 = F-A-010
99 = F-A-099
100 = F-A-100
999 = F-A-999
1000 = F-B-000
1009 = F-B-009
2099 = F-C-099
3999 = F-D-999
9999 = F-J-999
14999 = F-O-999
99999 = F-VD-999

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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