PHP creates a unique number class based on an auto-incremented ID

During the development process, our data tables generally use auto-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. We don’t know that this id is the id of the order table just by looking at the id. However, if it is converted to the number O-20160111197681234, it is very complicated. 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.

Rules for number creation

1. Unique
Use auto-increment id to ensure uniqueness

2.Short as possible
You can use the remainder of the number to find the corresponding letter to create a shorter number

Algorithm principle

1. Add a custom prefix for identification

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

For example:
id=1
Prefix= F
Keep 3 digits for the number
Then the created number 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

<?phprequire &#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-0019 = F-A-00910 = F-A-01099 = F-A-099100 = F-A-100999 = F-A-9991000 = F-B-0001009 = F-B-0092099 = F-C-0993999 = F-D-9999999 = F-J-99914999 = 
F-O-99999999 = F-VD-999

Source code download address: Click to view

During the development process, our data tables generally use auto-incrementing numbers as the primary key of id. The id is a numeric type and 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. We don’t know that this id is the id of the order table just by looking at the id. However, if it is converted to the number O-20160111197681234, it is very complicated. 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.

Rules for number creation

1. Unique
Use auto-increment id to ensure uniqueness

2.Short as possible
You can use the remainder of the number to find the corresponding letter to create a shorter number

Algorithm principle

1. Add a custom prefix for identification

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

For example:
id=1
Prefix= F
Keep 3 digits for the number
Then the created number 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

<?phprequire &#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-0019 = F-A-00910 = F-A-01099 = F-A-099100 = F-A-100999 = F-A-9991000 = F-B-0001009 = F-B-0092099 = F-C-0993999 = F-D-9999999 = F-J-99914999 = 
F-O-99999999 = F-VD-999

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