WordPressの記事更新をGoogleChatに通知する方法

function update_notify($id,$post){
  
  $result = array();

  $webhook_url = "<google chatのwebhook url>";
  if(
    $post->post_type == "post" &&
    $post->post_status == "publish" &&
    $post->post_date == $post->post_modified
  ){

    $data = json_encode([
    'text' => $post->post_title . "\n" . $post->guid
    ], JSON_UNESCAPED_UNICODE);

    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $webhook_url);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_CUSTOMREQUEST, 'POST');
    curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
    curl_setopt($curl, CURLOPT_HTTPHEADER, [
      'Content-Type: application/json',
    ]);

    $response = curl_exec($curl);
    curl_close($curl);
  }
}

add_action('wp_insert_post','update_notify',10,3);