Wednesday, May 1, 2013

simple mysql and php prodcuts and cart page example


create a mysql connect file and include here
and create table using this query

products table:
------------------------------------
    CREATE TABLE `php_shop_products` (
        `id` INT NOT NULL AUTO_INCREMENT ,
        `name` VARCHAR( 255 ) NOT NULL ,
        `description` TEXT,
        `price` DOUBLE DEFAULT '0.00' NOT NULL ,
        PRIMARY KEY ( `id` )
    );
Step->create config.php add the connect string
<?php
$con=mysql_connect('localhost','root','');
mysql_select_db('test',$con);

?>

create products.php page
<?php require_once('config.php') ;?>
<table border="1">


    <?php
       
        $sql = "SELECT id, name, description, price FROM php_shop_products;";
       
        $result = mysql_query($sql);
       
        while(list($id, $name, $description, $price) = mysql_fetch_row($result)) {
       
            echo "<tr>";
           
                echo "<td>$name</td>";
                echo "<td>$description</td>";
                echo "<td>$price</td>";
                echo "<td><a href=\"cart.php?action=add&id=$id\">Add To Cart</a></td>";
           
            echo "</tr>";
        }
       
    ?>
</table>


<a href="cart.php">View Cart</a>

-------------------------------------------------------------------------------------------------
create cart.php
<?php require_once('config.php') ;?>
<?php

    $product_id = $_GET['id'];     //the product id from the URL
    $action     = $_GET['action']; //the action from the URL

    //if there is an product_id and that product_id doesn't exist display an error message
    if($product_id && !productExists($product_id)) {
        die("Error. Product Doesn't Exist");
    }

    switch($action) {    //decide what to do   
   
        case "add":
            $_SESSION['cart'][$product_id]++; //add one to the quantity of the product with id $product_id
        break;
       
        case "remove":
            $_SESSION['cart'][$product_id]--; //remove one from the quantity of the product with id $product_id
            if($_SESSION['cart'][$product_id] == 0) unset($_SESSION['cart'][$product_id]); //if the quantity is zero, remove it completely (using the 'unset' function) - otherwise is will show zero, then -1, -2 etc when the user keeps removing items.
        break;
       
        case "empty":
            unset($_SESSION['cart']); //unset the whole cart, i.e. empty the cart.
        break;
   
    }
   
?>


<?php   

    if($_SESSION['cart']) {    //if the cart isn't empty
        //show the cart
       
        echo "<table border=\"1\" padding=\"3\" width=\"40%\">";    //format the cart using a HTML table
       
            //iterate through the cart, the $product_id is the key and $quantity is the value
            foreach($_SESSION['cart'] as $product_id => $quantity) {   
               
                //get the name, description and price from the database - this will depend on your database implementation.
                //use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
                $sql = sprintf("SELECT name, description, price FROM php_shop_products WHERE id = %d;",
                                $product_id);
                   
                $result = mysql_query($sql);
                   
                //Only display the row if there is a product (though there should always be as we have already checked)
                if(mysql_num_rows($result) > 0) {
               
                    list($name, $description, $price) = mysql_fetch_row($result);
               
                    $line_cost = $price * $quantity;        //work out the line cost
                    $total = $total + $line_cost;            //add to the total cost
               
                    echo "<tr>";
                        //show this information in table cells
                        echo "<td align=\"center\">$name</td>";
                        //along with a 'remove' link next to the quantity - which links to this page, but with an action of remove, and the id of the current product
                        echo "<td align=\"center\">$quantity <a href=\"$_SERVER[PHP_SELF]?action=remove&id=$product_id\">X</a></td>";
                        echo "<td align=\"center\">$line_cost</td>";
                   
                    echo "</tr>";
                   
                }
           
            }
           
            //show the total
            echo "<tr>";
                echo "<td colspan=\"2\" align=\"right\">Total</td>";
                echo "<td align=\"right\">$total</td>";
            echo "</tr>";
           
            //show the empty cart link - which links to this page, but with an action of empty. A simple bit of javascript in the onlick event of the link asks the user for confirmation
            echo "<tr>";
                echo "<td colspan=\"3\" align=\"right\"><a href=\"$_SERVER[PHP_SELF]?action=empty\" onclick=\"return confirm('Are you sure?');\">Empty Cart</a></td>";
            echo "</tr>";       
        echo "</table>";
       
       
   
    }else{
        //otherwise tell the user they have no items in their cart
        echo "You have no items in your shopping cart.";
       
    }
   
    //function to check if a product exists
    function productExists($product_id) {
            //use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
            $sql = sprintf("SELECT * FROM php_shop_products WHERE id = %d;",
                            $product_id);
               
            return mysql_num_rows(mysql_query($sql)) > 0;
    }
?>

<a href="products.php">Continue Shopping</a>





AttachmentSize
cart.php4.44 KB
products.php1.

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