Can Someone Explain me the below Code? - php

Question

Now my question is:
1) what the use of Order.php and why he create? and how can i store the Refrence of $order with the Object?
2) And please describe the code(i know the comment is already there but i need help )
Now Main.php:
<?php
include("Order.php");
include("connect.php");
$query="SELECT * FROM `orders`";
$filter_Result=mysqli_query($con,$query);
$newOrders=Array();
$items = array();
while($row=mysqli_fetch_array($filter_Result))
{
$order;
$orderId= $row['id']; //fetch row id
echo "hello".$orderId;
if(in_array($orderId,$newOrders,true)){
//we already created an array object for this id..use it
$order=<get order object from $newOrders for which id is $orderId>
}
else{
$order=new Order($row['id'], $row['tableId'], $row['createdDate']);
//$newOrders.AddToArray($order);
array_push($newOrders,$order);
}
$item=new Item($row['ProductId'], $row['ProductName'], $row['Quantity']);
$Order.AddItem($item);
}
foreach($order as $newOrders)
{
//create box
}
include("Modal.php");
?>
now Order.php:
<?php
class Order {
/* Member variables */
var $orderId;
var $orderTime;
var $tableNumber;
var $items = array();
function __Order($orderId, $orderTime, $tableNumber)
{
$this->$orderId = $orderId;
$this->$orderTime = $orderTime;
$this->$tableNumber = $tableNumber;
}
function AddItem($itemId, $itemName, $quantity, $personalization)
{
$item = new Item($itemId, $itemName, $quantity, $personalization);
$items[] = $item;
}
}
class Item {
var $productId;
var $productName;
var $quantity;
var $personalization;
function __Item($productId, $productName, $quantity, $personalization)
{
$this->$productId = $productId;
$this->$productName = $productName;
$this->$quantity = $quantity;
$this->$personalization = $personalization;
}
}
?>

Answer 1

He created the Order.php to keep the class elements external from the main code. This is cleaner code and easier to maintain.
and how can i store the Refrence of $order with the Object? You are already storing this in $newOrders?
Added comments to each line for main.php
<?php
// these includes are just bringing in code from external files. Nothing much really to say here.
include("Order.php");
include("connect.php");
//$query is just setting up the SQL query to the database for selecting all columns from a table called orders.
$query="SELECT * FROM `orders`";
//$filter_Results is just saving the query in a variable, this is used later on to fetch the data in a while loop
$filter_Result=mysqli_query($con,$query);
//$newOrders and $items = array() is just pre-defining these variables as arrays.
$newOrders=Array();
$items = array();
//As said before, we need to use a while loop to extract the data fetched from sql where `mysqli_fetch_array` is the method of retrieving the data.
while($row=mysqli_fetch_array($filter_Result))
{
$order; //Not sure what the next line is doing.. `$order;` doesn't do anything..
$orderId= $row['id']; //Saving the column name `id` as a variable $orderID
echo "hello".$orderId; //echo out the hello# where # is the orderID
//This is checking if the orderID retrieved from sql has already been placed inside the $newOrders array returning true or false.
if(in_array($orderId,$newOrders,true)){
//Some more code needs to be added here, I'm guessing you need to add in something to find the object relating to the `orderID` that already exists in `$newOrders`
$order=<get order object from $newOrders for which id is $orderId>
}
// If $orderID not in $newOrders
else{
// Create a new instance of Order class called $order
$order=new Order($row['id'], $row['tableId'], $row['createdDate']);
//Add this order to the array $newOrders
array_push($newOrders,$order);
}
// Create a new instance of the Item class called $item takinging in the columns ProductId, ProductName, Quantity
$item=new Item($row['ProductId'], $row['ProductName'], $row['Quantity']);
// Using a method from orders called AddItem (this can be found in Order.php under the order class
$Order.AddItem($item);
}
// Looping through each order inside $newOrders (although this seems wrong, should be foreach($newOrders as $order)
foreach($order as $newOrders)
{
//create box
}
/ Finally including some more code inside the Modal.php file
include("Modal.php");
?>
Order.php
<?php
// Class called Order
class Order {
// properties of the class.
var $orderId;
var $orderTime;
var $tableNumber;
var $items = array();
// Function inside the method which fills the properties upon creating a new instance the class `$order=new Order($row['id'], $row['tableId'], $row['createdDate']);`
function __Order($orderId, $orderTime, $tableNumber)
{
// Using the parameters passed to the function to fill the properties of the class
$this->$orderId = $orderId;
$this->$orderTime = $orderTime;
$this->$tableNumber = $tableNumber;
}
//Function called AddItem which takes parameters and fills an items array however this should be using $this->
function AddItem($itemId, $itemName, $quantity, $personalization)
{
$item = new Item($itemId, $itemName, $quantity, $personalization);
$items[] = $item;
}
}
// New class called Item
class Item {
// properties of the class.
var $productId;
var $productName;
var $quantity;
var $personalization;
// Same as above: Function inside the method which fills the properties upon creating a new instance the class
function __Item($productId, $productName, $quantity, $personalization)
{
$this->$productId = $productId;
$this->$productName = $productName;
$this->$quantity = $quantity;
$this->$personalization = $personalization;
}
}
?>
To answer your question:
An array of objects just means you are creating a new instance of the object and then saving the object in an array. You are already doing this with your $newOrders array. You have created a new $order (the object) and then saved it in the array $newOrders using: array_push($newOrders,$order);
Not really sure what you are asking for here? Where has this code come from? Is this a tutorial of some sort?