This is our regular traditional way of updating counter

server.php

<?php

class Trad
{
    public $id;
    public $count;
}

/**
 * Created by PhpStorm.
 * User: theophy
 * Date: 13/10/2017
 * Time: 5:38 AM
 */
class Traditional1
{
    private static $dbname = "playground";
    private static $username = "root";
    private static $password = "root";
    private $db;

    function __construct($id, $request)
    {
        $this->db = $this->connect();
        if ($request == "add")
            $this->like($id);
        else
            echo $this->getPost($id);
        echo "Done";
    }

    private function connect(){...}

    /**
     * @return PDO
     */
    private function getDb(){ ....   return $this->db; }
    
    private function like($id)
    {
        $post = $this->getPost($id);

        $this->savePost($id, $post->count + 1);
    }

    /**
     * this is used to get a post
     * @param $id
     * @return Trad
     */
    private function getPost($id)
    {
        try {
            $stmt = $this->getDb()->prepare("select * from traditional1 where id='$id'");
            $stmt->setFetchMode(PDO::FETCH_CLASS, "Trad");

            $stmt->execute();
            return $stmt->fetch();

        } catch (PDOException $ex) {
            print $ex->getMessage();
        }
    }

    /**
     * this is used to perform a simple save of our post
     * @param $id
     * @param $total
     */
    private function savePost($id, $total)
    {
        //form sql
        $sql = "update traditional1 set count='$total'  where id='$id'";

        $stmt = $this->getDb()->prepare($sql);
        $stmt->execute();
    }
}

new Traditional1($_GET['id'], $_GET['request']);

traditional1.js

const request = require('request');

for (let i = 0; i < 5; i++) {
    request.get(`http://localhost/playground/shard/Traditional1.php?id=1&request=add`, (error) => {
        if (error) return console.log(error);

        console.log(`process ${i} is added 1 to count`);
    })

}