makamo66 Posted November 6, 2019 Share Posted November 6, 2019 This is the code that I'm using for a shopping cart in order to update the quantity if the same product id is chosen. $cart_items is a two-dimensional session array composed of the id session array and the quantity session array. While looping through $cart_items, I create a temporary array $temp_array so that I can execute some logic on the array without changing the normal output. $temp_array is the $cart_items array without the last items which would be the $_REQUEST id and the $_REQUEST quantity. So the two $_REQUESTs are popped off with array_pop and then the remaining $_SESSIONs are compared to the $_REQUEST id with $j = array_search($_REQUEST["element_id_$i"], $temp_array); $j is now the key that corresponds to the id in $temp_array where the $_REQUEST id has been found. if( $j==$temp_array[$i]) If $j is the key of the item in $temp_array, then the $_REQUEST is unset and the quantities for the item are added together. There are two problems with this code. First of all the var_dump of the $temp_array is always an empty array but I am expecting to get an array with just the last element popped off. Secondly, I get the error "Undefined offset" for the $i variable in this line of the code: if( $j==$temp_array[$i]) foreach($cart_items as $item) { foreach($item["id"] as $key => $val) { foreach($item["quantity"] as $i => $value) { if ($key == $i){ $temp_array = $cart_items; $array = array_pop($temp_array); var_dump($temp_array); if (isset($_REQUEST["element_id_$i"]) && isset($_REQUEST["quantity_$i"])&& isset($value)){ $j = array_search($_REQUEST["element_id_$i"], $temp_array); if( $j==$temp_array[$i]) { echo "<b>SAME PRODUCT ADDED</b>"; $value += $_REQUEST["quantity_$i"]; unset($_REQUEST["element_id_$i"]); }}}}}} Quote Link to comment https://forums.phpfreaks.com/topic/309466-update-shopping-cart-by-adding-quantities-together-if-the-same-product-is-chosen/ Share on other sites More sharing options...
mac_gyver Posted November 6, 2019 Share Posted November 6, 2019 if you use the simple session cart definition that has been given on a different forum, using the item id as the array index, and storing the quantity as the array value under the index, doing what you are asking only takes a couple of lines of code. 1 Quote Link to comment https://forums.phpfreaks.com/topic/309466-update-shopping-cart-by-adding-quantities-together-if-the-same-product-is-chosen/#findComment-1571256 Share on other sites More sharing options...
makamo66 Posted November 6, 2019 Author Share Posted November 6, 2019 What is or where do I find this simple cart definition? Quote Link to comment https://forums.phpfreaks.com/topic/309466-update-shopping-cart-by-adding-quantities-together-if-the-same-product-is-chosen/#findComment-1571261 Share on other sites More sharing options...
Barand Posted November 6, 2019 Share Posted November 6, 2019 It's in mac_gyver's post that you just replied to ... 14 hours ago, mac_gyver said: using the item id as the array index, and storing the quantity as the array value under the index Do you not bother to read replies? Here's a sample script to illustrate the point <?php session_start(); $_SESSION['cart'] = $_SESSION['cart'] ?? []; if ($_SERVER['REQUEST_METHOD']=='POST') { $post = array_map('trim', $_POST); if (!empty($post['productid']) && !empty($post['qty'])) { if (!isset($_SESSION['cart'][$_POST['productid']])) { $_SESSION['cart'][$_POST['productid']] = 0; } $_SESSION['cart'][$_POST['productid']] += $_POST['qty']; } } ?> <!DOCTYPE html> <html> <head> <title>Example</title> <style type="text/css"> body { font-family: verdana, arial, sans-serif; font-size: 11pt; } fieldset { width: 400px; padding: 8px; } legend {background-color: #000; color: #FFF; padding: 4px; } label { display: inline-block; width: 100px; } </style> </head> <body> <?= '<pre>Cart = ' . print_r($_SESSION['cart'], 1) . '</pre>' ?> <form method="post"> <fieldset style='padding: 30px; width:400px;'> <legend>Add product to cart</legend> <label>Product</label> <select name='productid' required> <option value=''>- Choose product -</option> <option value='PROD1'>Widget</option> <option value='PROD2'>Gizmo</option> <option value='PROD3'>Wotsit</option> <option value='PROD4'>Thingy</option> </select> <br><br> <label>Quantity</label> <input type="number" name="qty" value="1" size="5" required> <br><br> <label></label> <input type="submit" name="btnSub" value="Submit"> </fieldset> </form> </body> </html> Screenshot: Quote Link to comment https://forums.phpfreaks.com/topic/309466-update-shopping-cart-by-adding-quantities-together-if-the-same-product-is-chosen/#findComment-1571263 Share on other sites More sharing options...
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