CODEWITHSUNDEEP
phpsession
johnobc
johnobc

Reputation: 581

Undefined variable: session start (Shopping cart attempt)

Iam no expert and just a student and I am attempting to creating a shopping cart, so far i understand that i have to use sessions to store id. my way to connect to my database is always like this:

<html>

<head>Shopping cart</head>

<?php

$session_start();

?>

<body>
<?php
    $serverName = "ephesus.cs.cf.ac.uk";
    $dbName = "c1429814";
    $user = "c1429814";
    $pass = "fakepassword";

    $con = mysqli_connect($serverName, $user, $pass, $dbName);

    if(!$con){
        die("failure to connect to the server ".mysqli_connect_error());
    }


    echo "<h1> Shopping cart </h1><br/>";   

    echo "<div class='text_border'>";

    if(isset($_GET['id']))
        $id=$_GET['id'];
    else
        $id=1;

    if(isset($_GET['action']))
        $action=$_GET['action'];
    else
        $action="empty";

    switch($action)
    {
    case "add":
        if  (isset($_SESSION['cart'][$id]))
            $_SESSION['cart'][$id]++;
        else
            $_SESSION['cart'][$id]=1;

    break;
    case "remove":
        if (isset($_SESSION['cart'][$id]))
        {
            $_SESSION['cart'][$id]--;
            if($_SESSION['cart'][$id]==0)
                unset($_SESSION['cast'][$id]);

        }   

    break;
    case "empty":
    unset($_SESSION['cart']);
    break;

    /*Display cart */
    if (isset($_SESSION['cart']))
    {
        echo "<table border = 0 cellspacing=0 width='500'>";
        $total = 0;
    foreach($_SESSION['cart'] as $id => $x)
    {   
        $query = "SELECT * FROM Software WHERE id = '$product' ";
        $result = mysqli_query($con, $query);


        $row = mysqli_fetch_array($result);
        $name = $row['name'];
        $name=substr($name, 0, 40);
        $price = $row['price'];
        $the_cost= $price * $x;
        $total = $total+$the_cost;

        echo "<tr>";
        echo "<td align='left'>$name </td>";
        echo "<td align='right'>$x <a           href='cart.php>id.".$id.">action=remove'>reduce'</a></td>";
        echo "<td align='right'>= $the_cost";
        echo "</tr>";
    }
        echo "<tr>";
        echo "<td align='right'><br>Total=</td>";
        echo "<td align='right'><b><br> $total </b></td>";
        echo "</tr>";
        echo "</table>";
    }
    else
        echo "Cart is empty";
    }

    ?>


</body>


</html>

I am getting an error which is called Undefined variable session, im not really sure what kind of variable i need to define to get around this? or is the way i connect to the database? any information that would could give me sufficient help and tips would be greatly appreciated. :)

Upvotes: 1

Views: 599

Answers (4)

Jagadeesh
Jagadeesh

Reputation: 764

Please use the following code which is simplified your code. '$' should not use in your session_start();

<?php
session_start();
?>


<head>Shopping cart</head>


<body>
    <?php
    $serverName = "ephesus.cs.cf.ac.uk";
    $dbName = "c1429814";
    $user = "c1429814";
    $pass = "ugsok4";

    $con = mysqli_connect($serverName, $user, $pass, $dbName);

    if (!$con) {
        die("failure to connect to the server " . mysqli_connect_error());
    }


    echo "<h1> Shopping cart </h1><br/>";

    echo "<div class='text_border'>";

    $id = isset($_GET['id']) ? $_GET['id'] : 1;
    $action = isset($_GET['action']) ? $_GET['action'] : 'empty';

    switch ($action) {
        case "add":
            if (isset($_SESSION['cart'][$id])) {
                $_SESSION['cart'][$id] ++;
            } else {
                $_SESSION['cart'][$id] = 1;
            }
            break;

        case "remove":
            if (isset($_SESSION['cart'][$id])) {
                $_SESSION['cart'][$id] --;

                if ($_SESSION['cart'][$id] == 0)
                    unset($_SESSION['cast'][$id]);
            }

            break;

        case "empty":
            unset($_SESSION['cart']);
            break;

            /* Display cart */
            if (isset($_SESSION['cart'])) {
                echo "<table border = 0 cellspacing=0 width='500'>";
                $total = 0;
                foreach ($_SESSION['cart'] as $id => $x) {
                    $query = "SELECT * FROM Software WHERE id = '$product' ";
                    $result = mysqli_query($con, $query);
                    $row = mysqli_fetch_array($result);
                    $name = $row['name'];
                    $name = substr($name, 0, 40);
                    $price = $row['price'];
                    $the_cost = $price * $x;
                    $total = $total + $the_cost;

                    echo "<tr>";
                    echo "<td align='left'>$name </td>";
                    echo "<td align='right'>$x <a           href='cart.php>id." . $id . ">action=remove'>reduce'</a></td>";
                    echo "<td align='right'>= $the_cost";
                    echo "</tr>";
                }
                echo "<tr>";
                echo "<td align='right'><br>Total=</td>";
                echo "<td align='right'><b><br> $total </b></td>";
                echo "</tr>";
                echo "</table>";
            } else {
                echo "Cart is empty";
            }
    }
    ?>


</body>

Upvotes: 1

Vistor
Vistor

Reputation: 148

Try to open the session before the HTML and remove $

Like this:

<?php
  session_start();
?>

<html>

<head>Shopping cart</head>


<body>
<?php
    $serverName = "ephesus.cs.cf.ac.uk";
    $dbName = "c1429814";
    $user = "c1429814";
    $pass = "ugsok4";

    $con = mysqli_connect($serverName, $user, $pass, $dbName);

    if(!$con){
        die("failure to connect to the server ".mysqli_connect_error());
    }


    echo "<h1> Shopping cart </h1><br/>";   

    echo "<div class='text_border'>";

    if(isset($_GET['id']))
        $id=$_GET['id'];
    else
        $id=1;

    if(isset($_GET['action']))
        $action=$_GET['action'];
    else
        $action="empty";

    switch($action)
    {
    case "add":
        if  (isset($_SESSION['cart'][$id]))
            $_SESSION['cart'][$id]++;
        else
            $_SESSION['cart'][$id]=1;

    break;
    case "remove":
        if (isset($_SESSION['cart'][$id]))
        {
            $_SESSION['cart'][$id]--;
            if($_SESSION['cart'][$id]==0)
                unset($_SESSION['cast'][$id]);

        }   

    break;
    case "empty":
    unset($_SESSION['cart']);
    break;

    /*Display cart */
    if (isset($_SESSION['cart']))
    {
        echo "<table border = 0 cellspacing=0 width='500'>";
        $total = 0;
    foreach($_SESSION['cart'] as $id => $x)
    {   
        $query = "SELECT * FROM Software WHERE id = '$product' ";
        $result = mysqli_query($con, $query);


        $row = mysqli_fetch_array($result);
        $name = $row['name'];
        $name=substr($name, 0, 40);
        $price = $row['price'];
        $the_cost= $price * $x;
        $total = $total+$the_cost;

        echo "<tr>";
        echo "<td align='left'>$name </td>";
        echo "<td align='right'>$x <a           href='cart.php>id.".$id.">action=remove'>reduce'</a></td>";
        echo "<td align='right'>= $the_cost";
        echo "</tr>";
    }
        echo "<tr>";
        echo "<td align='right'><br>Total=</td>";
        echo "<td align='right'><b><br> $total </b></td>";
        echo "</tr>";
        echo "</table>";
    }
    else
        echo "Cart is empty";
    }

    ?>


</body>


</html>

Upvotes: 1

Tomasz Cz.
Tomasz Cz.

Reputation: 334

use session_start(); (without the dollar sign) instead, since you are calling a function not accessing a variable. And as a side note: "To use cookie-based sessions, session_start() must be called before outputing anything to the browser." More here: http://php.net/manual/en/function.session-start.php

Upvotes: 1

Julo0sS
Julo0sS

Reputation: 2102

$ is used for php variables... you do not need $ when you use functions, and open it above all code...

so here : 

//...
session_start();
//...

will be better....

Upvotes: 1

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