شرح كود اضافة منتجات في ال php

<?php 

$title = "Add new Product";

include("head.php");  

$con = connectBD();

$item_name = isset($_POST['item_name'])?$_POST['item_name']:"";

$item_desc = isset($_POST['item_desc'])?$_POST['item_desc']:""; 

$price = isset($_POST['price'])?$_POST['price']:"0"; 

$category_id = isset($_POST['category_id'])?$_POST['category_id']:"0"; 

$item_price = isset($_POST['item_price'])?$_POST['item_price']:"0"; 

$item_qty = isset($_POST['item_qty'])?$_POST['item_qty']:"0"; 

if(isset($_GET['action']) && $_GET['action']=="edit")

{

$id = $_GET['id'];

if(isset($_POST['item_name']) && $_POST['item_name']!="" && $_POST['item_desc']!="" && isset($_FILES['item_img']) && $_FILES['item_img']['size']>0)

{

$imgURL = "../images/" .$_FILES['item_img']['name'];

move_uploaded_file($_FILES['item_img']['tmp_name'], $imgURL); 

if(editItem($con, $id , $item_name , $item_desc, $imgURL , $item_price,  $category_id, $item_qty ))

echo "<div class='info'>Product updatd successfully.</div>";

else

echo "<div class='info'>Couldn't update this product, please try again later.</div>";

}else{

$sql = "SELECT * FROM `items` where id = ".$id;

$res = mysqli_query($con, $sql);

$row = mysqli_fetch_array($res);

$item_name = $row["name"]; 

$item_desc = $row["description"]; 

$item_price = $row["price"]; 

$category_id = $row["category_id"]; 

$item_qty = $row["qty"]; 

if(isset($_FILES['item_img']['size']) && $_FILES['item_img']['size']==0){

echo "<div class='errorbox notice'>You didn't select an image.</div>";

}  

?>