if$event->；上的分析错误；键入条纹webhook

我使用以下代码作为stripe-webhook，从phpmailer向用户发送cutsom电子邮件。这是的要点。

我似乎不明白为什么会出现这个错误，我很少使用php，所以我确信这是我不熟悉的东西，这就是我收到的错误。

分析错误：语法错误，意外的"$event"（T_VARIABLE），应为第24行/usr/share/nginx/html/emailReceipt.php中的"（"

代码

<?php
// SETUP:
// 1. Customize all the settings (stripe api key, email settings, email text)
// 2. Put this code somewhere where it's accessible by a URL on your server.
// 3. Add the URL of that location to the settings at https://manage.stripe.com/#account/webhooks
// 4. Have fun!
// set your secret key: remember to change this to your live secret key in production
// see your keys here https://manage.stripe.com/account
//Stripe::setApiKey("YOUR STRIPE SECREY KEY");
Stripe::setApiKey("sk_test_WggOmz2smwT9nGdx7aos2R5Q");

// retrieve the request's body and parse it as JSON
$body = @file_get_contents('php://input');
$event_json = json_decode($body);
// for extra security, retrieve from the Stripe API
$event_id = $event_json->id;
$event = Stripe_Event::retrieve($event_id);
// This will send receipts on succesful invoices
if $event->type == 'invoice.payment_succeeded' {
  email_invoice_receipt(event->data->object);
}
function email_invoice_receipt($invoice) {
  $customer = Stripe_Customer::retrieve($invoice->customer);
  //Make sure to customize your from address
  $subject = 'Your payment has been received';
  $headers = 'From: "MyApp Support" <support@myapp.com>';
  mail($customer->email, $subject, message_body(), $headers);
}
function format_stripe_amount($amount) {
  return sprintf('$%0.2f', $amount / 100.0);
}
function format_stripe_timestamp($timestamp) {
  return strftime("%m/%d/%Y", $timestamp);
}
function payment_received_body($invoice, $customer) {
  $subscription = $invoice->lines->subscriptions[0];
  return <<'EOF'
Dear {$customer->email}:
This is a receipt for your subscription. This is only a receipt,
no payment is due. Thanks for your continued support!
-------------------------------------------------
SUBSCRIPTION RECEIPT
Email: {$customer->email}
Plan: {$subscription->plan->name}
Amount: {format_stripe_amount($invoice->total)} (USD)
For service between {format_stripe_timestamp($subscription->period->start)} and {format_stripe_timestamp($subscription->period->end)}
-------------------------------------------------
EOF;
}
?>