Home > Article > Backend Development > 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.
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
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
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); $word = ''; while($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==''){ $word = chr(65); } // 生成数字部分 $mod = $id % $base; $digital = str_pad($mod, $num_length, 0, STR_PAD_LEFT); $code = sprintf('%s-%s-%s', $prefix, $word, $digital); return $code; } } // class end?>
demo.php
<?phprequire 'IDCode.class.php';$test_ids = array(1,9,10,99,100,999,1000,1009,2099,3999,9999,14999,99999);foreach($test_ids as $test_id){ echo $test_id.' = '.IDCode::create($test_id, 3, 'F').'<br>'; }?>
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.
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
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
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); $word = ''; while($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==''){ $word = chr(65); } // 生成数字部分 $mod = $id % $base; $digital = str_pad($mod, $num_length, 0, STR_PAD_LEFT); $code = sprintf('%s-%s-%s', $prefix, $word, $digital); return $code; } } // class end?>
demo.php
<?phprequire 'IDCode.class.php';$test_ids = array(1,9,10,99,100,999,1000,1009,2099,3999,9999,14999,99999);foreach($test_ids as $test_id){ echo $test_id.' = '.IDCode::create($test_id, 3, 'F').'<br>'; }?>
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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