I have a page with questions which are loaded from the database. Each question composes of three choices, which are radio buttons. The User is asked to answer each question by clicking on one of the three buttons for each questions. Once they are done, they may press the button called "Proceed" to continue navigating. However, when they click on proceed, I want to save the choices made by the user so that the user can review his / her choices later. This page aims to support potentially thousands of users. I am using Laravel as a framework, HTML, MYSQl as the database, and PHP.
*Edit
Sorry for the misunderstanding, I did not intend to be effortless. I was simply wondering what possible options there were. Back to this topic, as I have looked in to various approaches through web searches and going over the old developer's code on this project, I found out that he/she used javascript's document.submit() function. What does document.submit() do? I tried using it on my own as well but the clicking on the save button did not perform anything visually on the webpage.
There are a few options on storing user submitted data like in your case.
One idea would be to make use of HTML5 Local Storage. This is similar to cookies, however local storage is more secure and can handle large amounts of data without affecting the website's performance. You can nest it inside a javascript function that is triggered when the user clicks 'proceed'. The data is then stored in the browser, and can be recalled at a later time. The only downside is that some older browsers may not support Local Storage.
Another option would be to store all user submitted data in a database using MySQL with PHP.
I can't give any details on how to implement these options as there isn't really enough information in your question to base it on, but hopefully it'll point you in the right direction.