Question

It is display $x as undefined. What is wrong with my switch statement?

http://localhost/add.php?price_error=1

switch(isset($_GET['price_error']) && $_GET['price_error'] == $x){

            case 1:
                echo '<span class="error_msg">Discount price cannot be greater than original price</span><br/>';
                break;

            case 2:
                echo '<span class="error_msg">Discount cannot be less than 30% of original price</span><br/>';
                break;

            case 3:
                echo '<span class="error_msg">Discount price and original price cannot be greater than $30000 HKD</span><br/>';
                break;

            default: 
                false;
                break;
        }

Answer 1

Switches typically have variable parameters.

Try:

if(isset($_GET['price_error']) && $_GET['price_error'] == $x){
    switch($x){ 
        //code
    }
}