PHP MYSQL POS

0-PHP-POS.MD

SIMPLE PHP MYSQL POS SYSTEM

https://code-boxx.com/pos-system-php-mysql/

IMAGES

NOTES

1. Run unpack.bat (Windows) unpack.sh (Linux/Mac), this will create an assets folder and download all the above images.
2. Create a database and import 1-database.sql.
3. Change the database settings in 2-lib-pos.php to your own.
4. Launch 4a-pos.html in the web browser.

LICENSE

Copyright by Code Boxx

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

1-database.sql

-- (A) ITEMS
CREATE TABLE `items` (
  `item_id` bigint(20) NOT NULL,
  `item_name` varchar(255) NOT NULL,
  `item_price` decimal(12,2) NOT NULL,
  `item_image` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `items`
  ADD PRIMARY KEY (`item_id`),
  ADD KEY `item_name` (`item_name`);

ALTER TABLE `items`
  MODIFY `item_id` bigint(20) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;

INSERT INTO `items` (`item_id`, `item_name`, `item_price`, `item_image`) VALUES
(1, 'Penne Fried Rice', '1.10', 'img-a.png'),
(2, 'Pineapple Pizza', '2.20', 'img-b.png'),
(3, 'Ice Cream Rice', '3.30', 'img-c.png'),
(4, 'Sushi Pancake', '4.40', 'img-d.png'),
(5, 'Vegan Rice', '5.50', 'img-e.png'),
(6, 'Candy Soup', '6.60', 'img-f.png');

-- (B) ORDERS
CREATE TABLE `orders` (
  `order_id` bigint(20) NOT NULL,
  `oder_date` datetime NOT NULL DEFAULT current_timestamp(),
  `order_total` decimal(12,2) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `orders`
  ADD PRIMARY KEY (`order_id`),
  ADD KEY `oder_date` (`oder_date`);

ALTER TABLE `orders`
  MODIFY `order_id` bigint(20) NOT NULL AUTO_INCREMENT;

-- (C) ORDER ITEMS
CREATE TABLE `order_items` (
  `order_item_id` bigint(20) NOT NULL,
  `order_id` bigint(20) NOT NULL,
  `item_name` varchar(255) NOT NULL,
  `item_price` decimal(12,0) NOT NULL,
  `item_qty` bigint(20) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

ALTER TABLE `order_items`
  ADD PRIMARY KEY (`order_item_id`),
  ADD KEY `order_id` (`order_id`),
  ADD KEY `item_name` (`item_name`);

ALTER TABLE `order_items`
  MODIFY `order_item_id` bigint(20) NOT NULL AUTO_INCREMENT;

2-lib-pos.php

<?php
class POS {
  // (A) CONSTRUCTOR - CONNECT TO DATABASE
  private $pdo = null;
  private $stmt = null;
  public $error = "";
  function __construct () {
    $this->pdo = new PDO(
      "mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET,
      DB_USER, DB_PASSWORD, [
      PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
      PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
    ]);
  }

  // (B) DESTRUCTOR - CLOSE DATABASE CONNECTION
  function __destruct () {
    if ($this->stmt!==null) { $this->stmt = null; }
    if ($this->pdo!==null) { $this->pdo = null; }
  }

  // (C) HELPER FUNCTION - EXECUTE SQL QUERY
  function query ($sql, $data=null) : void {
    $this->stmt = $this->pdo->prepare($sql);
    $this->stmt->execute($data);
  }

  // (D) SAVE ITEM
  function saveItem ($name, $price, $img=null, $id=null) {
    // (D1) NEW ITEM
    if ($id==null) {
      $sql = "INSERT INTO `items` (`item_name`, `item_price`, `item_image`) VALUES (?,?,?)";
      $data = [$name, $price, $img];
    }

    // (D2) UPDATE ITEM
    else {
      $sql = "UPDATE `items` SET `item_name`=?, `item_price`=?, `item_image`=? WHERE `item_id`=?";
      $data = [$name, $price, $img, $id];
    }

    // (D3) RUN SQL + UPDATE TIMESTAMP
    // YOU MIGHT WANT TO KEEP THIS IN THE DATABASE INSTEAD...
    $this->query($sql, $data);
    file_put_contents(
      __DIR__ . DIRECTORY_SEPARATOR . "updated.php",
      "<?php define('POS_UPDATE', ".strtotime("now").");"
    );
    return true;
  }

  // (E) CHECKOUT ORDER
  function checkout ($items, $total, $timestamp) {
    // (E1) CHECK TIMESTAMP
    if ($timestamp < POS_UPDATE) {
      $this->error = POS_UPDATE;
      return false;
    }

    // (E2) ORDERS ENTRY
    $this->query(
      "INSERT INTO `orders` (`order_total`) VALUES (?)", [$total]
    );

    // (E3) ORDER ITEMS
    $id = $this->pdo->lastInsertId();
    $sql = "INSERT INTO `order_items` (`order_id`, `item_name`, `item_price`, `item_qty`) VALUES ";
    $data = [];
    $items = json_decode($items, true);
    foreach ($items as $i) {
      $sql .= "(?,?,?,?),";
      $data[] = $id;
      $data[] = $i["n"];
      $data[] = $i["p"];
      $data[] = $i["q"];
    }
    $sql = substr($sql, 0, -1) . ";";
    $this->query($sql, $data);

    // (E4) DONE
    return true;
  }

  // (F) GET ALL ITEMS
  function getAll () {
    $this->query("SELECT * FROM `items`");
    return $this->stmt->fetchAll();
  }
}

// (G) DATABASE SETTINGS - CHANGE TO YOUR OWN!
define("DB_HOST", "localhost");
define("DB_NAME", "test");
define("DB_CHARSET", "utf8mb4");
define("DB_USER", "root");
define("DB_PASSWORD", "");

// (H) LAST UPDATED
require "updated.php";

// (I) NEW POS OBJECT
$_POS = new POS();

3-ajax-pos.php

<?php
require "2-lib-pos.php";
if (isset($_POST["req"])) { switch ($_POST["req"]) {
  // (A) CHECK LAST UPDATE
  case "check":
    echo POS_UPDATE;
    break;

  // (B) GET ALL ITEMS
  case "getAll":
    echo json_encode($_POS->getAll());
    break;

  // (C) CHECKOUT ORDER
  case "checkout":
    echo $_POS->checkout($_POST["items"], $_POST["total"], $_POST["timestamp"])
      ? "OK" : $_POS->error ;
    break;
}}

4a-pos.html

<!DOCTYPE html>
<html>
  <head>
    <!-- TITLE + CHARSET + DESCRIPTION + VIEWPORT + FAVICON -->
    <title>POS Page</title>
    <meta charset="utf-8">
    <meta name="description" content="PHP POS">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.5">
    <link rel="icon" href="assets/favicon.png" type="image/png">
    
    <!-- ANDROID + CHROME + APPLE + WINDOWS APP -->
    <meta name="mobile-web-app-capable" content="yes">
    <meta name="theme-color" content="white">
    <link rel="apple-touch-icon" href="assets/icon-512.png">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <meta name="apple-mobile-web-app-status-bar-style" content="black">
    <meta name="apple-mobile-web-app-title" content="PHP POS">
    <meta name="msapplication-TileImage" content="assets/icon-512.png">
    <meta name="msapplication-TileColor" content="#ffffff">
    
    <!-- WEB APP MANIFEST -->
    <!-- https://web.dev/add-manifest/ -->
    <link rel="manifest" href="5a-manifest.json">

    <!-- SERVICE WORKER -->
    <script>
    if ("serviceWorker" in navigator) {
      navigator.serviceWorker.register("5b-worker.js");
    }
    </script>

    <!-- STYLESHEET + JAVASCRIPT -->
    <script src="4b-pos.js"></script>
    <script src="4c-cart.js"></script>
    <link rel="stylesheet" href="4d-pos.css">
  </head>
  <body>
    <!-- (A) ITEMS LIST -->
    <div id="left"><div id="list"></div></div>

    <!-- (B) CART ITEMS -->
    <div id="right"><div id="cart"></div></div>
  </body>
</html>

4b-pos.js

var pos = {
  // (A) PROPERTIES
  iName : "POS", // idb name
  iDB : null, iTX : null, // idb object & transaction
  updated : null, // last updated timestamp
  items : null, // items list
  hList : null, // html items list
  hCart : null, // html cart items

  // (B) HELPER FUNCTION - AJAX FETCH
  fetch : (req, data, after) => {
    // (B1) FORM DATA
    let form = new FormData();
    form.append("req", req);
    if (data != null) { for (let [k,v] of Object.entries(data)) {
      form.append(k, v);
    }}

    // (B2) GO!
    fetch("3-ajax-pos.php", { method: "post", body: form })
    .then(res => res.text())
    .then(txt => after(txt))
    .catch(err => console.error(err));
  },

  // (C) HELPER FUNCTION - UPDATE INDEXED DATABASE ITEMS
  update : ts => pos.fetch("getAll", null, items => {
    // (C1) CLEAR OLD ITEMS
    pos.iTX().clear();

    // (C2) UPDATE ITEMS
    items = JSON.parse(items);
    let count = 0;
    for (let i of items) {
      let req = pos.iTX().put(i);
      req.onsuccess = () => {
        count++;
        if (count==items.length) {
          localStorage.setItem("POSUpdate", ts);
          pos.draw(cart.empty);
          alert("Item database updated.");
        }
      };
    }
  }),

  // (D) INITIALIZE
  init : () => {
    // (D1) IDB SUPPORT CHECK
    window.indexedDB = window.indexedDB || window.mozIndexedDB || window.webkitIndexedDB || window.msIndexedDB;
    if (!window.indexedDB) {
      alert("Your browser does not support indexed database.");
      return false;
    }

    // (D2) OPEN "POS" DATABASE
    let req = window.indexedDB.open(pos.iName, 1);

    // (D3) ON DATABASE ERROR
    req.onerror = evt => {
      alert("Indexed DB init error - " + evt.message);
      console.error(evt);
    };

    // (D4) UPGRADE NEEDED
    req.onupgradeneeded = evt => {
      // (D4-1) INIT UPGRADE
      pos.iDB = evt.target.result;
      pos.iDB.onerror = evt => {
        alert("Indexed DB upgrade error - " + evt.message);
        console.error(evt);
      };

      // (D4-2) VERSION 1
      if (evt.oldVersion < 1) {
        let store = pos.iDB.createObjectStore(pos.iName, { keyPath: "item_id" });
      }
    };

    // (D5) OPEN DATABASE OK
    req.onsuccess = evt => {
      // (D5-1) REGISTER IDB OBJECTS
      pos.iDB = evt.target.result;
      pos.iTX = () => {
        return pos.iDB
        .transaction(pos.iName, "readwrite")
        .objectStore(pos.iName);
      };

      // (D5-2) GET HTML ELEMENTS
      pos.hList = document.getElementById("list");
      pos.hCart = document.getElementById("cart");

      // (D5-3) LAST UPDATED - ITEMS
      pos.updated = localStorage.getItem("POSUpdate");
      if (pos.updated== null) { pos.updated = 0; }

      // (D5-4) CHECK SERVER FOR ITEM UPDATES
      pos.fetch("check", null, ts => {
        if (ts > pos.updated) { pos.update(ts); }
        else { pos.draw(() => { cart.load(); cart.draw(); }); }
      });
    };
  },

  // (E) GET & DRAW ITEMS
  draw : after => {
    let req = pos.iTX().getAll();
    req.onsuccess = () => {
      pos.hList.innerHTML = "";
      pos.items = {};
      for (let i of req.result) {
        pos.items[i["item_id"]] = i;
        let item = document.createElement("div");
        item.className = "item";
        item.innerHTML = `<img class="iImg" src="assets/${i["item_image"]}">
        <div class="iName">${i["item_name"]}</div>
        <div class="iPrice">$${i["item_price"]}</div>`;
        item.onclick = () => { cart.add(i["item_id"]); };
        pos.hList.appendChild(item);
      }
      if (after) { after(); }
    };
  }
};
window.onload = pos.init;

4c-cart.js

var cart = {
  // (A) PROPERTIES
  items : {}, // current items in cart
  total : 0, // total amount

  // (B) SAVE CART ITEMS TO LOCALSTORAGE
  save : () => localStorage.setItem("POSCart", JSON.stringify(cart.items)),

  // (C) LOAD CART ITEMS FROM LOCALSTORAGE
  load : () => {
    cart.items = localStorage.getItem("POSCart");
    if (cart.items==null) { cart.items = {}; }
    else { cart.items = JSON.parse(cart.items); }
  },

  // (D) DRAW CART ITEMS
  draw : () => {
    // (D1) RESET TOTAL
    cart.total = 0;

    // (D2) CART EMPTY
    if (Object.keys(cart.items).length === 0) {
      pos.hCart.innerHTML = `<div class="cItem">Cart Empty</div>`;
    }
    
    // (D3) DRAW CART
    else {
      // (D3-1) RESET HTML
      pos.hCart.innerHTML = "";

      // (D3-2) CART ITEMS
      let item;
      for (let [id, qty] of Object.entries(cart.items)) {
        let itotal = pos.items[id]["item_price"] * qty;
        cart.total += itotal;
        item = document.createElement("div");
        item.className = "cRow";
        item.innerHTML = `<div class="cDel" onclick="cart.change(${id}, 0)">X</div>
        <div class="cItem">
          <div class="cName">${pos.items[id]["item_name"]}</div>
          <div class="cPrice">$${itotal.toFixed(2)}</div>
        </div>
        <input type="number" min="0" class="cQty" onchange="cart.change(${id}, this.value)" value="${qty}">`;
        pos.hCart.appendChild(item);
      }

      // (D3-3) TOTAL
      item = document.createElement("div");
      item.className = "cRow";
      item.innerHTML = `<div class="cTotal">Total</div><div class="cAmt">$${cart.total.toFixed(2)}</div>`;
      pos.hCart.appendChild(item);
      
      // (D3-4) RESET
      item = document.createElement("input");
      item.type = "button";
      item.value = "Reset";
      item.onclick = cart.empty;
      pos.hCart.appendChild(item);

      // (D3-5) CHECKOUT
      item = document.createElement("input");
      item.type = "button";
      item.value = "Checkout";
      item.onclick = cart.checkout;
      pos.hCart.appendChild(item);
    }
  },

  // (E) ADD ITEM TO CART
  add : id => {
    if (cart.items[id]==undefined) { cart.items[id] = 1; }
    else { cart.items[id]++; }
    cart.save();
    cart.draw();
  },

  // (F) CHANGE QUANTITY + REMOVE ITEM FROM CART
  change : (id, qty) => {
    if (qty==0) { delete cart.items[id]; }
    else if (qty!="") { cart.items[id] = parseInt(qty); }
    cart.save();
    cart.draw();
  },

  // (G) EMPTY CART
  empty : () => {
    cart.items = {};
    cart.save();
    cart.draw();
  },

  // (H) CHECKOUT
  checkout : () => {
    // (H1) RESHUFFLE ITEMS
    let items = [];
    for (let [id, qty] of Object.entries(cart.items)) {
      items.push({
        n : pos.items[id]["item_name"],
        p : pos.items[id]["item_price"],
        q : qty
      });
    }

    // (H2) SEND TO SERVER
    pos.fetch("checkout", {
      items : JSON.stringify(items),
      total : cart.total.toFixed(2),
      timestamp : pos.updated
    }, res => {
      // (H3) "LOCAL ITEMS OUTDATED"
      if (isFinite(res)) { pos.update(parseInt(res)); }

      // (H4) OK
      else if (res=="OK") {
        cart.empty();
        alert("OK");
      }

      // (H5) NOT OK
      else { alert(res); }
    });
  }
};

4d-pos.css

/* (A) ENTIRE PAGE */
* {
  font-family: Arial, Helvetica, sans-serif;
  box-sizing: border-box;
}
body {
  display: flex;
  max-width: 1000px;
  min-height: 100vh;
  margin: 0 auto;
  padding: 0;
  background: #222;
}
#left, #right { padding: 10px; }
#left { flex-grow: 1; }
#right {
  width: 240px;
  flex-shrink: 0;
}

/* (B) ITEMS LIST */
#list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-gap: 10px;
}
@media only screen and (max-width: 800px) {
  #list { grid-template-columns: repeat(2, 1fr); }
}
.item {
  cursor: pointer;
  color: #404040;
  background: #f2f2f2;
}
.iImg {
  object-fit: contain;
  width: 100%;
  background: #f6f6f6;
}
.iName, .iPrice {
  padding: 5px;
  font-weight: 700;
}
.iPrice { color: #6a7bf1; }

/* (C) CART */
#cart { color: #fff; }
.cDel, #cart input[type=button] { cursor: pointer; }
.cRow {
  display: flex;
  align-items: center;
  padding: 10px;
  border-bottom: 1px solid #dfdfdf;
}
.cDel {
  color: #c92f2f;
  font-size: 24px;
  margin-right: 5px;
}
.cItem {
  flex-grow: 1;
  padding: 5px;
}
.cName { font-weight: 700; }
.cQty {
  width: 40px;
  padding: 10px 5px;
  text-align: center;
  border: 1px solid #aaa;
}
.cTotal, .cAmt {
  font-weight: 700;
  padding: 10px 0;
}
.cTotal { flex-grow: 1; }
#cart input[type=button] {
  width: 45%;
  padding: 10px;
  margin: 20px 5px 0 5px;
  border: 0;
  font-weight: 700;
  color: #fff;
  background: #1852d5;
}

5a-manifest.json

{
  "short_name": "POS",
  "name": "PHP POS",
  "icons": [{
    "src": "assets/favicon.png",
    "sizes": "64x64",
    "type": "image/png"
  }, {
    "src": "assets/icon-512.png",
    "sizes": "512x512",
    "type": "image/png"
  }],
  "start_url": "4a-pos.html",
  "scope": "/",
  "background_color": "white",
  "theme_color": "white",
  "display": "standalone"
}

5b-worker.js

// (A) CREATE/INSTALL CACHE
self.addEventListener("install", evt => {
  self.skipWaiting();
  evt.waitUntil(
    caches.open("PHPPOS")
    .then(cache => cache.addAll([
      "4a-pos.html",
      "4b-pos.js",
      "4c-cart.js",
      "4d-pos.css",
      "5a-manifest.json",
      "assets/favicon.png",
      "assets/icon-512.png"
    ]))
    .catch(err => console.error(err))
  );
});

// (B) CLAIM CONTROL INSTANTLY
self.addEventListener("activate", evt => self.clients.claim());

// (C) LOAD FROM CACHE FIRST, FALLBACK TO NETWORK IF NOT FOUND
self.addEventListener("fetch", evt => evt.respondWith(
  caches.match(evt.request).then(res => res || fetch(evt.request))
));

unpack.bat

md assets
curl https://user-images.githubusercontent.com/11156244/239247626-91561738-be24-4822-be36-71cb5067fd0f.png --ssl-no-revoke --output assets/favicon.png
curl https://user-images.githubusercontent.com/11156244/239247649-43dee2cc-7065-470e-821f-77e7378bbd1e.png --ssl-no-revoke --output assets/icon-512.png
curl https://user-images.githubusercontent.com/11156244/282650904-05dac31a-97c4-4e04-acd2-4529afb4b9e9.png --ssl-no-revoke --output assets/img-a.png
curl https://user-images.githubusercontent.com/11156244/282650909-ff5fb791-01b2-459b-98fe-7a5d02190cda.png --ssl-no-revoke --output assets/img-b.png
curl https://user-images.githubusercontent.com/11156244/282650911-8303db6b-12b5-4f39-ba4a-934d9d235854.png --ssl-no-revoke --output assets/img-c.png
curl https://user-images.githubusercontent.com/11156244/282650914-99750227-8ea7-4675-9ab6-cd29b56737c0.png --ssl-no-revoke --output assets/img-d.png
curl https://user-images.githubusercontent.com/11156244/282650917-f579d703-4bf8-4822-97b2-f65cb02a8279.png --ssl-no-revoke --output assets/img-e.png
curl https://user-images.githubusercontent.com/11156244/282650920-591ec336-c020-4da9-b80b-fae13d317dcb.png --ssl-no-revoke --output assets/img-f.png

unpack.sh

mkdir -m 777 assets
curl https://user-images.githubusercontent.com/11156244/239247626-91561738-be24-4822-be36-71cb5067fd0f.png --ssl-no-revoke --output ./assets/favicon.png
curl https://user-images.githubusercontent.com/11156244/239247649-43dee2cc-7065-470e-821f-77e7378bbd1e.png --ssl-no-revoke --output ./assets/icon-512.png
curl https://user-images.githubusercontent.com/11156244/282650904-05dac31a-97c4-4e04-acd2-4529afb4b9e9.png --ssl-no-revoke --output ./assets/img-a.png
curl https://user-images.githubusercontent.com/11156244/282650909-ff5fb791-01b2-459b-98fe-7a5d02190cda.png --ssl-no-revoke --output ./assets/img-b.png
curl https://user-images.githubusercontent.com/11156244/282650911-8303db6b-12b5-4f39-ba4a-934d9d235854.png --ssl-no-revoke --output ./assets/img-c.png
curl https://user-images.githubusercontent.com/11156244/282650914-99750227-8ea7-4675-9ab6-cd29b56737c0.png --ssl-no-revoke --output ./assets/img-d.png
curl https://user-images.githubusercontent.com/11156244/282650917-f579d703-4bf8-4822-97b2-f65cb02a8279.png --ssl-no-revoke --output ./assets/img-e.png
curl https://user-images.githubusercontent.com/11156244/282650920-591ec336-c020-4da9-b80b-fae13d317dcb.png --ssl-no-revoke --output ./assets/img-f.png

updated.php

<?php define('POS_UPDATE', 1659061930);