Fatal error: [] operator not supported for strings ERROR shopping cart

问题

I'm trying to store items in a shopping cart from user input in a form using sessions. This is my code to store the items in the cart.

//Create cart if it doesn't already exist
if (!isset($_SESSION['Cart']))
{ 
$_SESSION['Cart'] = array(); 
}
//Add an item only if required movie info needed
if(isset($_POST['Cinema']) && isset($_POST['Day']) && isset($_POST['Time']) &&        isset($_POST['Quantity']) && isset($_POST['Price']))
{

$ITEM = array(

'Cinema' => $_POST['Cinema'], 
'Day' => $_POST['Day'], 
'Time' => $_POST['Time'],
'Quantity' => $_POST['Quantity'],
'Price' => $_POST['Price']
  );

 //Add this item to the cart
 $_SESSION['Cart'][] =  $ITEM;
}

However, I keep getting this error :

 Fatal error: [] operator not supported for strings in Line 31.

---

Lines 31 is :  $_SESSION['Cart'][] =  $ITEM;

Is my syntax wrong?

回答1:

As of the moment, $_SESSION['Cart'] is a string, not an array - and you can't push to a string as if you would push to an array.

You need to clear the session using session_unset(), then reset $_SESSION['Cart'] to be an array.

来源：https://stackoverflow.com/questions/26292717/fatal-error-operator-not-supported-for-strings-error-shopping-cart