PHP Fatal error: Uncaught Error: [] operator not supported for strings

I am worrking on creating a pixel for facebook. I got everything to work except on the checkout success page I get an error

Below is the code causing the error. Can someone assist me or lead me in the right direction on getting this solved.

PHP Fatal error: Uncaught Error: [] operator not supported for strings in xxx

$product_ids[] = (int)$product['id'];

sorry here is the piece of code. The error is coming from $product_ids[] = (int)$product['id'];

case FILENAME_CHECKOUT_SUCCESS:
if ($zv_orders_id > 0) {
if(!class_exists('order')) require_once DIR_WS_CLASSES . 'order.php';
$order = new order($zv_orders_id);
$products = $order->products;
foreach ($products as $product) {
$product_ids[] = (int)$product['id'];
}
echo "fbq('track', 'Purchase', {\n
value: " . number_format($order->info['total'], 2, '.', '') . ",\n
currency: '" . $_SESSION['currency'] . "',\n
content_type: 'product',\n
content_ids: ['" . implode("','", $product_ids) . "']\n
});";
}
break;

Maybe:

case FILENAME_CHECKOUT_SUCCESS:
if ($zv_orders_id > 0) {
if(!class_exists('order')) require_once DIR_WS_CLASSES . 'order.php';
$order = new order($zv_orders_id);
$products = $order->products;
fbp_pids = array();
foreach ($products as $product) {
$fbp_pids[] = (int)$product['id'];
}
echo "fbq('track', 'Purchase', {\n
value: " . number_format($order->info['total'], 2, '.', '') . ",\n
currency: '" . $_SESSION['currency'] . "',\n
content_type: 'product',\n
content_ids: ['" . implode("','", $fbp_pids) . "']\n
});";
}
break; 

I tried your suggestion but it did not seem to work. Any other ideas?

chadlly2003:

I tried your suggestion but it did not seem to work. Any other ideas?

Please elaborate on "did not seem to work". Did the error go away? Did the desired result get seen? What didn't work? What error(s) are now being generated with the modification that balihr suggested (which looks reasonable).

Other than there is a dollar sign missing
fbp_pids = array();
Should be:
$fbp_pids = array();

mc12345678:

Please elaborate on "did not seem to work". Did the error go away? Did the desired result get seen? What didn't work? What error(s) are now being generated with the modification that balihr suggested (which looks reasonable).

Other than there is a dollar sign missing
fbp_pids = array();
Should be:
$fbp_pids = array();

:bangin::bangin:

Sorry for the typo... mc12345678 is right, there's a dollar sign missing. Try this:

case FILENAME_CHECKOUT_SUCCESS:
if ($zv_orders_id > 0) {
if(!class_exists('order')) require_once DIR_WS_CLASSES . 'order.php';
$order = new order($zv_orders_id);
$products = $order->products;
$fbp_pids = array();
foreach ($products as $product) {
$fbp_pids[] = (int)$product['id'];
}
echo "fbq('track', 'Purchase', {\n
value: " . number_format($order->info['total'], 2, '.', '') . ",\n
currency: '" . $_SESSION['currency'] . "',\n
content_type: 'product',\n
content_ids: ['" . implode("','", $fbp_pids) . "']\n
});";
}
break;

that work thank you......