How to make a comments system with PHP and JS

[Greenreader9]

@agagaga

PHP script will need to access that database. Won’t that count as a hit every time, regardless of if it even actually has been 5 seconds?

Correct and correct

@agagaga

Even if it doesn’t count as a hit every time a PHP script access that database, can’t someone just repeatedly spam the post/request comments button making it so that nobody else can comment

You will need to associate the cooldown with a specific user. Users do need an account to post, right?

@agagaga

What is the difference between using a JSON file versus an SQL database to store cooldown times and the comments themselves?

Easier to code and faster for the code to run. Plus, there is a 10MB limit on file (JSON), but not a set limit that you will realistically run into (MySQL)

@agagaga

If every JS to PHP request counts as a hit, and cooldowns are utterly useless

Well the cooldown will help prevent spam

@agagaga

then does that mean there is not a single thing I can do to prevent DDOS attacks on my website?

With a free subdomain? No. with a custom domain? Yes:

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@agagaga

Won’t this make InfinityFree incredibly insecure for anyone who wishes to host a website that includes client to server interactions?

Even if you just host a static single-site page, you are still vulnerable to DDoS attacks. the fact that the site is multi-page, dynamic, etc does not increase/reduce your risk of getting attacked.

@agagaga

So, should I put all the PHP logic, HTML elements, and JS code all in one file, or not?

Up to you.

@agagaga

How do I use JS to communicate with PHP without using AJAX

JS can’t communicate with PHP without creating a hit. JS is on the client-side, and it does not run until AFTER the PHP code does.