I have a shopping cart type arrangement. The customer builds the order in tiers. So page one is item 1, page 2 item 2....... The page does not reload during the building of a order. (jqtouch) My way of building the order is add each item to an array. Below is how I have created the array.
var item_contents= new Array();
so typical order with two items would look something like..
item_contents[0] = 627
item_contents[1] = 451
item_contents[2] = 365
item_contents[3] = 548
item_contents[4] = 158
item_contents[5] = 154
item_contents[6] = 155
item_contents[7] = 115
The number is the item_id number in a database. The user has the ability to go back and alter an item in the array for the current order.
When the checkout screen is shown this needs to be submitted and details for the respective item_id returned. I guess the best way would be someway to replicate the array above in php. How Would I POST an array like this and get it to look identical in php?
Thx
jquery post
var a = [627,451,365,548,158,115,155,115];
$.post("ajax.php",{data: a},function(data){
console.log(data);
});
php
<?php
$array = json_decode($_POST['data']);
foreach($array as $key => $value){
add(sanitize($value[$key]));
}
?>
Related
I am writing some code to supply the Google certified shop data which I have nearly finished. I only need to supply the ship and delivery dates. I have written code to supply this information at the product level. However when there is more than one product in an order I need to select the largest ship date.
For example;
Order has two products.
Producta with $ship_date = 2 and porductb with $ship_date = 5
I need to collect all the $ship_dates (2 and 5) and return the highest one (5).
My question is simply how do I write the php to collect all the $ship_dates correctly - should I create an array and if so how?
Put all the required variables into an array, then use max.
$ship_date1 = 2;
$ship_date2 = 5;
$shipDates = [$ship_date1, $ship_date2];
// other dates as needed
// OR, a much cleaner solution, append to the array
$shipDates = [];
$shipDates[] = 2;
$shipDates[] = 5;
//No matter how you fill up the array, this is how you get its maximum value
$maxShipDate = max($shipDates);
max actually accepts individual variables instead (eg. max($ship_date1, $ship_date2);) but the array solution is easier to maintain.
OK before my foreach product loop I added this;
$deliverydatearray = array();
which creates a new (empty) array which I called $deliverydatearray
Within my foreach product loop I added this;
$deliverydatearray[] = $delivery_datep;
which adds my product specific delivery date ($delivery_datep) to my array.
After the foreach product loop has closed I can access the variables in my array. For example just printing the contents of the array is done like this;
print_r($deliverydatearray);
which looks like this;
Array
(
[0] => 2017-01-28
[1] => 2017-01-23
)
I have a SESSION['cart'] with ID numbers only. I have a form passing the ID with a remove button. Once passed to my controller, I cannot figure out how to write the code that uses the ID ($_POST['id']) to delete the item from the SESSION['cart'].
I can loop through and display the array contents, but I cannot figure out how to delete based on ID passed from the form.
How do I loop through the SESSION['cart'] array to find a match with the ID passed from my delete form, and then delete that ID? I know that unset($_SESSION['cart'][X] deletes the ID at index X, but I cannot figure out how to loop through all the elements to find a match.
I have read a number of related issues in this forum but have been unable to apply any of those solutions to resolve this challenge. Any assistance is appreciated.
The way you have your values ($products = array(3,7,99,152)) isn't a very good method. Every time you want to perform an action, you have to loop through the array, you don't want that. Apart from that, how do you store quantity? Or variations like e.g. size or color?
if your structure is $array[ ID_OF_PRODUCT ], you can simply do this:
unset( $_SESSION['cart'][$_POST['id']] ); // Instant access via the key!
This should be the method to use. This allows you to create an array like this, with advanced info, but with easy access (42/63 are example id's)
$_SESSION['cart']['products'][42] = array(
'quantity' = 11,
'size' = 'large',
'color' = 'blue'
);
$_SESSION['cart']['products'][63] = array(
'quantity' = 9,
'size' = 'small',
'color' = 'red'
);
This way you can access a lot of info with the product ID, and now also see which size and color (both just examples) the user selected. You may not have need for this now, but you will further down the road :)
As you might see, you can easily do stuff with the item:
isset($_SESSION['cart'][$_POST['id']]); // check if the product exists
unset($_SESSION['cart'][$_POST['id']]); // remove the product
echo $_SESSION['cart'][$_POST['id']]['quantity']; // get the quantity.
Not a loop in the code. You should only use loops when you have to, try to somewhat avoid them because often their slow. Say you have an extreme case of 1000 items in your shop, and you need to delete no999... That'll take a noticable moment.
Here is the code to do it right:
$id = $_POST['id'];
$items = $_SESSION["cart"];
if(($key = array_search($id, $items)) !== false) {
unset($items[$key]);
}
$_SESSION["cart"] = array_values($items);
Advice
Beside item ID, you can also sve item count in SESSION array because user can add several times same item into cart. In that case your $_SESSION["card"] should be structured like:
array(
'1'=>12,//Item with ID=1 is added 12 times in shopping cart
'17'=>2,//Item with ID=17 is added 2 times in shopping cart etc.
'32'=>12,
)
I have a problem updating a multidimensional array in PHP. I'm trying to implement am e-commerce website for a project and I am having problems with the shopping cart implementation.
Basically, I use a session to track the items the user adds to the shopping cart. Here's my logic in plain Pseudo code that is executed once the user clicks the add button after specifying a quantity to add for a product:
RETRIEVE 'cartItems' 2D array from SESSION array
IF 'cartItems' array does not exist in the session create new empty array and add the cartItem sub array to it with the qty and productID
ELSE Loop through the array retrieved from the SESSION array, find the product ID that matches the given product ID (index 0) and update the qty for that subarray (index 1).
Here is my PHP script addToCart.php which in turn calls another function in another script file that is included in it:
<?php
require_once("cart_utility.php");
session_start();
// Script for adding a given product to the client's cart through the use of Ajax and sessions
// retrieve values from ajax request
$productID = $_GET["productID"];
$qty = $_GET["qty"];
$cartItems = null;
// use sessions to add the items to the user's cart
// retrieve the multi-dimensional cart array if it exists, otherwise create one and add it
if(isset($_SESSION["cartItems"])){
$cartItems = $_SESSION["cartItems"];
}
else{
$cartItems = array();
}
addQtyForProduct($productID, $qty, $cartItems);
$_SESSION["cartItems"] = $cartItems;
print "Session cartItems after function return: ";
var_dump($_SESSION["cartItems"]);
// return info string with new qty of cart items
print ("success-" . getTotalCartItems($cartItems));
?>
And here's the other script file that does the handling of inserting and updating the array:
<?php
// Utility functions for retrieving items from the 2D cart items array
/* The array structure is given as (example values):
* | productID | qty |
* 0 | 1 | 3 |
* 1 | 2 | 1 |
* 2 | 5 | 8 |
* 3 | 8 | 3 |
*/
// increments the qty for the given product. If it does not exist then it is added into the main session array
// $cartItems: the main 2D array with the structure given above, pass by reference to change the array
function addQtyForProduct($productID, $qty, &$cartItems)
{
foreach($cartItems as $cartItem)
{
var_dump($cartItem);
if($cartItem[0] == $productID){
//print "Quantity given to increment: $qty";
//var_dump($cartItem);
print "Qty in current session array: $cartItem[1]";
$cartItem[1] += $qty;
print "New qty in cartItem array: $cartItem[1]";
return;
}
}
// not found, therefore add it to the main items array
array_push($cartItems, array($productID, $qty));
}
// returns the total number of items in the cart
function getTotalCartItems($cartItems)
{
$total = 0;
foreach($cartItems as $cartItem)
$total += $cartItem[1];
return $total;
}
?>
I have placed some var_dump statements and can confirm that upon returning from the function 'addQtyForProduct', the array is not updated. But why? I pass the array by reference to directly alter it's contents.
It successfully adds on the first time when there is no existing array but fails to increment if the array exists.
Also, the values are successfully incremented in the 'addQtyForProduct' function but the array somehow is not updated when it returns from the function.
I would gladly appreciate some help on this. I've been trying to understand this for days now and It's driving me nuts.
As read on this page you should use references. Add a & in front of your $cartItem and your script should work. Right now PHP stores a 'copy' of every value in your array in $cartItem, rather than it's reference. So currently you are editing a copy of the original, rather than the original array.
Bit stuck on how to achieve this.....
I have a PHP page which shows information for one record in a table. These records include a unique key (image_id) AND a name (image_name).
In order to display the correct record, I am using a search function on a previous page which results in a URL parameter (imageinfo.php?image_id=1 etc).
My problem is that I wish to add forward and back arrows to the table to cycle through different records, BUT based on the alphabetical order of 'image_name' rather than the numerical order of 'image_id.
I'm really not sure how to achieve this, so any help would be appreciated.
Something like this: (I hope the comments will explain)
<?php
$data = array(
123 => "B",
321 => "C",
124 => "A"
);
$id = 123; // This is the current image id
asort($data); // Sort the array based on values (names)
// Advance the internal pointer until it points to the current image
while(current($data) != $data[$id])
next($data);
// TODO: Also check whether next is past end here
echo next($data); // Should be C
I am using a form that is pulling data from two MySQL databases into a single dynamic page. When a user clicks add to cart I want to store that data in a multi dimensional session array to call up later when they click view cart. I am wondering how to auto increment the subset identifier(array key?) of the item when a new item is added from the add to cart form. This is what I have so far:
$newitem = array ($row_getimages['icon'],$row_getimages['title'],$row_getshoppingcart['medium'],$row_getshoppingcart['size'],$row_getshoppingcart['price'],$row_getshoppingcart['shipping']);
session_start();
if(isset($_SESSION['item'][1]))
$_SESSION['item'][1] = $_SESSION['item'][1]+ 1;
else
$_SESSION['item'][1] = 1;
Also any help for calling out the data later would be appreciated. As a user may have 1 or 20 items stored in the session I am not sure how to make sure all items would be echoed no matter how many they have added.
This is my first time at a multi dimensional array and sessions. Obviously because the image page is dynamic and purchase price is based on several factors, just using a MySQL database of available items as I have in the past is out of the question.
Thank you in advance for your time.
$newitem = array ('id' => $row_getshoppingcart['id'] , 'icon' => $row_getimages['icon'],'title' => $row_getimages['title'],'medium' => $row_getshoppingcart['medium'],'size' => $row_getshoppingcart['size'],'price' => $row_getshoppingcart['price'],'shipping' => $row_getshoppingcart['shipping']);
session_start();
$_SESSION['item'][] = $newitem;
That is all you have to do, if I understand your system correctly.
UPDATE
I updated the $newitem array to include array keys. You can reference the new item info with arrays like this:
$_SESSION['item'][(num)]['id']
Or you can loop through the results like this:
foreach ( $_SESSION['item'] AS $item )
{
echo 'id: ' . $item['id'] . '<br />';
echo 'title: ' . $item['title'];
// and so on
}
If it is not important for the numbers to be sequential, you can use:
$_SESSION['item'][] = array('a','b','c','d','e','f');
Using [] will simply add a new element to the end of the array.
However, I would probably use a product ID for the key.