In this tutorial, we'll develop a secure poll and voting system using PHP and MySQL. This system will allow you to interact with your audience and display a collection of polls. You'll learn to create polls, implement a voting system, delete polls, and display the list of published polls., What is placeholder data? Placeholder data allows a query to behave as if it already has data, similar to the initialData option, but the data is not persisted to the cache., Whether you need to poll an API at a regular interval, fetch data in the background, or transform the data before it’s returned to the component, options like refetchInterval, refetchIntervalInBackground, and select make it easy to get the job done., REST publisher channel has an option to poll data periodically. However, I have yet to figure out how to use parameters in the poll URL. The REST end point I am hitting has a timestamp parameter which I need to use to poll the data from the endpoint. I would like to update that parameter with every subsequent poll., Placeholder data allows a query to behave as if it already has data, similar to the initialData option, but the data is not persisted to the cache. This comes in handy for situations where you have enough partial (or fake) data to render the query successfully while the actual data is fetched in the background., We make use of Placeholder in forms, to show data related to the entity. For example let's say we have an EditUser page and form. We are using Placeholder as an example while viewing this page, to show some interesting live updating status about some thing based on this user..