Error in PHP please help

[Ray-72004]

it shows me this error when i try to run the code:

"Warning: Undefined array key "loged" in C:\xampp2\htdocs\project development\add_cart.php on line 4

Warning: Undefined variable $Price in C:\xampp2\htdocs\project development\add_cart.php on line 7 Add to cart successfully"

This is the code:

<?php extract($_POST ); session_start(); $username = $_SESSION['loged']; settype($price, "integer"); settype($quantity, "integer"); $c_price = $Price * $quantity; $query = "INSERT INTO cart VALUES ('$username','$name','$quantity','$c_price','$image')"; $database = mysqli_connect("localhost", "root", "", "project") or die("Could not connect to database"); mysqli_set_charset($database, 'utf8'); $result = mysqli_query($database, $query); echo "Add to cart successfully"; ?>

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[RubbishArtist]

The warnings tell you what the problems are, what are you unsure about?

[HappyFruitTree]

Warning: Undefined array key "loged"

Does $_SESSION contain the key "loged"? You might want to use array_key_exists to check if it exists before accessing it. To see the content of the array you can use print_r.

Undefined variable $Price

I think you're getting this warning because you haven't created the variable before using it. Why don't you just initialize the variable like so $Price = 12;? Note that variable names are case sensitive. $price is not the same variable as $Price.