i have a session variables with name
$_session['cart_10'], $_session['cart_2'], $_session['cart_8'], $_session['cart_110'], $_session['city'], $_session['location'], $_session['store_id']
now i want to unset all session variable that start with 'cart' like following session variable
$_session['cart_10'], $_session['cart_2'], $_session['cart_8'], $_session['cart_110']
please help me to solve that problem