{"id":1026,"date":"2019-08-16T08:09:37","date_gmt":"2019-08-16T08:09:37","guid":{"rendered":"http:\/\/www.withinweb.com\/info\/?p=1026"},"modified":"2019-08-16T09:02:19","modified_gmt":"2019-08-16T09:02:19","slug":"a-shopping-cart-using-php-sessions-code","status":"publish","type":"post","link":"https:\/\/www.withinweb.com\/info\/a-shopping-cart-using-php-sessions-code\/","title":{"rendered":"A Shopping Cart using PHP Sessions"},"content":{"rendered":"

\"\"<\/a>This posts illustrates a relatively simple shopping cart in PHP <\/strong>using sessions<\/strong> to store cart details, quantities and total cart amount.\u00a0 The cart has an add to cart button , remove from cart button and displays the total value of the cart.<\/p>\n

This post is taken from part of the book PHP Tutorials: Programming with PHP and MySQL<\/strong> which is available as a paper back printed version or as a downloadable Kindle version. Click here for paper back version<\/a>.<\/p>\n

The following listing is the complete shopping cart in PHP:<\/p>\n

<?php session_start();\n#cart.php - A simple shopping cart with add to cart, and remove links\n \/\/---------------------------\n \/\/initialize sessions\n\n\/\/Define the products and cost\n$products = array(\"product A\", \"product B\", \"product C\");\n$amounts = array(\"19.99\", \"10.99\", \"2.99\");\n\n\/\/Load up session\n if ( !isset($_SESSION[\"total\"]) ) {\n   $_SESSION[\"total\"] = 0;\n   for ($i=0; $i< count($products); $i++) {\n    $_SESSION[\"qty\"][$i] = 0;\n   $_SESSION[\"amounts\"][$i] = 0;\n  }\n }\n\n \/\/---------------------------\n \/\/Reset\n if ( isset($_GET['reset']) )\n {\n if ($_GET[\"reset\"] == 'true')\n   {\n   unset($_SESSION[\"qty\"]); \/\/The quantity for each product\n   unset($_SESSION[\"amounts\"]); \/\/The amount from each product\n   unset($_SESSION[\"total\"]); \/\/The total cost\n   unset($_SESSION[\"cart\"]); \/\/Which item has been chosen\n   }\n }\n\n \/\/---------------------------\n \/\/Add\n if ( isset($_GET[\"add\"]) )\n   {\n   $i = $_GET[\"add\"];\n   $qty = $_SESSION[\"qty\"][$i] + 1;\n   $_SESSION[\"amounts\"][$i] = $amounts[$i] * $qty;\n   $_SESSION[\"cart\"][$i] = $i;\n   $_SESSION[\"qty\"][$i] = $qty;\n }\n\n  \/\/---------------------------\n  \/\/Delete\n  if ( isset($_GET[\"delete\"]) )\n   {\n   $i = $_GET[\"delete\"];\n   $qty = $_SESSION[\"qty\"][$i];\n   $qty--;\n   $_SESSION[\"qty\"][$i] = $qty;\n   \/\/remove item if quantity is zero\n   if ($qty == 0) {\n    $_SESSION[\"amounts\"][$i] = 0;\n    unset($_SESSION[\"cart\"][$i]);\n  }\n else\n  {\n   $_SESSION[\"amounts\"][$i] = $amounts[$i] * $qty;\n  }\n }\n ?>\n <h2>List of All Products<\/h2>\n <table>\n   <tr>\n   <th>Product<\/th>\n   <th width=\"10px\">&nbsp;<\/th>\n   <th>Amount<\/th>\n   <th width=\"10px\">&nbsp;<\/th>\n   <th>Action<\/th>\n   <\/tr>\n <?php\n for ($i=0; $i< count($products); $i++) {\n   ?>\n   <tr>\n   <td><?php echo($products[$i]); ?><\/td>\n   <td width=\"10px\">&nbsp;<\/td>\n   <td><?php echo($amounts[$i]); ?><\/td>\n   <td width=\"10px\">&nbsp;<\/td>\n   <td><a href=\"?add=<?php echo($i); ?>\">Add to cart<\/a><\/td>\n   <\/tr>\n   <?php\n }\n ?>\n <tr>\n <td colspan=\"5\"><\/td>\n <\/tr>\n <tr>\n <td colspan=\"5\"><a href=\"?reset=true\">Reset Cart<\/a><\/td>\n <\/tr>\n <\/table>\n <?php\n if ( isset($_SESSION[\"cart\"]) ) {\n ?>\n <br\/><br\/><br\/>\n <h2>Cart<\/h2>\n <table>\n <tr>\n <th>Product<\/th>\n <th width=\"10px\">&nbsp;<\/th>\n <th>Qty<\/th>\n <th width=\"10px\">&nbsp;<\/th>\n <th>Amount<\/th>\n <th width=\"10px\">&nbsp;<\/th>\n <th>Action<\/th>\n <\/tr>\n <?php\n $total = 0;\n foreach ( $_SESSION[\"cart\"] as $i ) {\n ?>\n <tr>\n <td><?php echo( $products[$_SESSION[\"cart\"][$i]] ); ?><\/td>\n <td width=\"10px\">&nbsp;<\/td>\n <td><?php echo( $_SESSION[\"qty\"][$i] ); ?><\/td>\n <td width=\"10px\">&nbsp;<\/td>\n <td><?php echo( $_SESSION[\"amounts\"][$i] ); ?><\/td>\n <td width=\"10px\">&nbsp;<\/td>\n <td><a href=\"?delete=<?php echo($i); ?>\">Delete from cart<\/a><\/td>\n <\/tr>\n <?php\n $total = $total + $_SESSION[\"amounts\"][$i];\n }\n $_SESSION[\"total\"] = $total;\n ?>\n <tr>\n <td colspan=\"7\">Total : <?php echo($total); ?><\/td>\n <\/tr>\n <\/table>\n <?php\n }\n ?><\/pre>\n
The cart example uses the following sessions to maintain the state of the cart:<\/p>\n
$_SESSION[“qty”][i] Stores the quantity for each product
\n$_SESSION[“amounts”][i] Stores the price from each product
\n$_SESSION[“cart”][i] Identifies which items have been added to the cart
\n$_SESSION[“total”] Stores the total cost<\/p>\n
The sessions are actually arrays so in the case of:<\/p>\n
$_SESSION[“qty”][i]<\/p>\n
is the quantity for the element with number i.<\/p>\n
Description of the PHP shopping cart code<\/strong><\/h4>\n
We start by defining PHP to use sessions by:<\/p>\n
session_start();<\/pre>\n
This has to be at the very top of the PHP page.<\/p>\n
Next we set up our products and populate our sessions. In this example we are using a fixed array<\/strong> of product descriptions and amounts. You may want to do this in your application or you could read in the data into the $product and $amounts array from a database<\/strong>.<\/p>\n
\/\/---------------------------\n \/\/initialise sessions\n\n \/\/Define the products and cost\n $products = array(\"product A\", \"product B\", \"product C\");\n $amounts = array(\"19.99\", \"10.99\", \"2.99\");\n\n if ( !isset($_SESSION[\"total\"]) ) {\n\n  $_SESSION[\"total\"] = 0;\n\n  for ($i=0; $i< count($products); $i++) {\n   $_SESSION[\"qty\"][$i] = 0;\n   $_SESSION[\"amounts\"][$i] = 0;\n }\n}\n<\/pre>\n
The following code will reset and clear the sessions when the Reset Cart link is selected.<\/p>\n
\/\/---------------------------\n  \/\/Reset\n  if ( isset($_GET['reset']) )\n   {\n    if ($_GET[\"reset\"] == 'true')\n    {\n     unset($_SESSION[\"qty\"]); \/\/The quantity for each product\n     unset($_SESSION[\"amounts\"]); \/\/The amount from each product\n     unset($_SESSION[\"total\"]); \/\/The total cost\n     unset($_SESSION[\"cart\"]); \/\/Which item has been chosen\n   }\n}\n<\/pre>\n
The following code adds an item to the sessions when the ‘Add to Cart’ link is clicked:<\/p>\n
\/\/---------------------------\n\/\/Add\nif ( isset($_GET[\"add\"]) )\n{\n$i = $_GET[\"add\"];\n\n$qty = $_SESSION[\"qty\"][$i] + 1;\n\n$_SESSION[\"amounts\"][$i] = $amounts[$i] * $qty;\n$_SESSION[\"cart\"][$i] = $i;\n$_SESSION[\"qty\"][$i] = $qty;\n}<\/pre>\n
and the following deletes an item from the cart when the ‘Delete from Cart’ link is clicked:<\/p>\n
 \/\/---------------------------\n \/\/Delete\n if ( isset($_GET[\"delete\"]) )\n {\n   $i = $_GET[\"delete\"];\n   $qty = $_SESSION[\"qty\"][$i];\n   $qty--;\n   $_SESSION[\"qty\"][$i] = $qty;\n\n \/\/remove item if quantity is zero\n if ($qty == 0) {\n   $_SESSION[\"amounts\"][$i] = 0;\n   unset($_SESSION[\"cart\"][$i]);\n }\n else\n {\n   $_SESSION[\"amounts\"][$i] = $amounts[$i] * $qty;\n }\n }<\/pre>\n
The rest of the code is the visual display using a table and various loops to show the product lists and the cart details together with the links.<\/p>\n
This post is taken from part of the book PHP Tutorials: Programming with PHP and MySQL<\/strong> which is available as a paper back printed version or as a downloadable Kindle version. Click here for paper back version<\/a>.<\/p>\n
PHP-eSeller<\/strong> is a complete application that utilizes a shopping cart using PHP Sessions and is available from here:<\/p>\n
Click here to go to PHP-eSeller web page<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
This posts illustrates a relatively simple shopping cart in PHP using sessions to store cart details, quantities and total cart amount.\u00a0 The cart has an add to cart button , remove from cart button and displays the total value of…<\/span><\/p>\n
Read more A Shopping Cart using PHP Sessions<\/span> ›<\/span><\/a><\/div>\n
<\/p>\n","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,3],"tags":[],"class_list":["post-1026","post","type-post","status-publish","format-standard","hentry","category-general-php","category-php-eseller"],"yoast_head":"\nA Shopping Cart using PHP Sessions - PHP Web Applications<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.withinweb.com\/info\/a-shopping-cart-using-php-sessions-code\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A Shopping Cart using PHP Sessions - PHP Web Applications\" \/>\n<meta property=\"og:description\" content=\"This posts illustrates a relatively simple shopping cart in PHP using sessions to store cart details, quantities and total cart amount.\u00a0 The cart has an add to cart button , remove from cart button and displays the total value of…Read more A Shopping Cart using PHP Sessions ›\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.withinweb.com\/info\/a-shopping-cart-using-php-sessions-code\/\" \/>\n<meta property=\"og:site_name\" content=\"PHP Web Applications\" \/>\n<meta property=\"article:published_time\" content=\"2019-08-16T08:09:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-08-16T09:02:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.withinweb.com\/info\/wp-content\/uploads\/2015\/07\/shopping_trolly.jpg\" \/>\n<meta name=\"author\" content=\"paulv\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"paulv\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/\"},\"author\":{\"name\":\"paulv\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/#\\\/schema\\\/person\\\/04da5531c302d55ffcd777fe81dbb93c\"},\"headline\":\"A Shopping Cart using PHP Sessions\",\"datePublished\":\"2019-08-16T08:09:37+00:00\",\"dateModified\":\"2019-08-16T09:02:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/\"},\"wordCount\":384,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/wp-content\\\/uploads\\\/2015\\\/07\\\/shopping_trolly.jpg\",\"articleSection\":[\"General PHP\",\"PHP-eSeller\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/\",\"url\":\"https:\\\/\\\/www.withinweb.com\\\/info\\\/a-shopping-cart-using-php-sessions-code\\\/\",\"name\":\"A Shopping Cart using PHP Sessions - 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