Detailed explanation of PHP generating unique RequestID class

This article introduces PHP to generate a unique RequestID class, using the session_create_id() and uniqid() methods to ensure uniqueness and provide Complete code and demonstration for everyone to learn and use.

Current system designs generally use distributed systems. A request may call several microservices for processing, and finally return the result. When there is a problem with a request, it is difficult for us to track which microservice has the problem.

When each request accesses the server, we can add a unique identifier (RequestID) to this access, at the beginning of the request, during the request process, and at the end of the request , write the key data of this request process into the log (such as the parameters during the access, the methods passed, the microservices, the data returned at the end, etc.), which can be used for reference when there is a problem with the access to facilitate tracking of the problem.
For example, a request needs to go through several microservices before returning the output

Request->A->B->C-A->Output

If there is no output during the access process, or there is an error in the output, we can find the logs corresponding to A, B, and C based on the RequestID to check which service has the problem.

The code is as follows:

RequestID.class.php

<?php/**
 * PHP生成唯一RequestID类
 * Date:    2018-04-10
 * Author:  fdipzone
 * Version: 1.0
 *
 * Description:
 * PHP实现生成唯一RequestID类，使用session_create_id()与uniqid()方法实现，保证唯一性。
 *
 * Func:
 * public  generate 生成唯一请求id
 * private format   格式化请求id
 */class RequestID{ // class start
    /**
     * 生成唯一请求id
     * @return String
     */
    public static function generate(){
        // 使用session_create_id()方法创建前缀
        $prefix = session_create_id(date('YmdHis'));        // 使用uniqid()方法创建唯一id
        $request_id = strtoupper(md5(uniqid($prefix, true)));        // 格式化请求id
        return self::format($request_id);
    }    /**
     * 格式化请求id
     * @param  String $request_id 请求id
     * @param  Array  $format     格式
     * @return String
     */
    private static function format($request_id, $format='8,4,4,4,12'){
        $tmp = array();        $offset = 0;        $cut = explode(',', $format);        // 根据设定格式化
        if($cut){            foreach($cut as $v){                $tmp[] = substr($request_id, $offset, $v);                $offset += $v;
            }
        }        // 加入剩余部分
        if($offset<strlen($request_id)){            $tmp[] = substr($request_id, $offset);
        }        return implode('-', $tmp);
    }
} // class end?>

demo:

<?phprequire 'RequestID.class.php';// 生成10个请求idfor($i=0; $i<10; $i++){    echo RequestID::generate().PHP_EOL;
}?>

Output:

16532925-4502-CDAD-23A2-463FC7B5803A500B77AD-CD24-0DDA-9E6E-2FDF2DD7CA94813143D0-958F-9F56-E04F-679598594452E5EE1B0B-E0D6-3E60-D831-462C5A262FCE79E714B5-A37F-4B5E-4EDE-83E18391EBF9
E1C440AB-FC2C-AC74-E79A-016FD59D9651
AE483861-1040-BE8D-E523-D7638D0F0D35BBD7A03A-36C9-24B7-C453-FB1DDD6E201EBF62C3E6-9C5F-22CB-668D-381863B35268
E97E1F44-F048-962A-5BF7-1113727551B1

Note that the session_create_id method requires php7.1 or above before it can be used.

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