I hope you're doing well. I'm currently working on a PHP project and I'm trying to figure out the best way to filter all the `$_POST` variables in a correct way. I've heard that filtering user inputs is crucial for security purposes, but I'm not sure how to go about it properly.
I want to make sure that any data coming from the `$_POST` superglobal is safe and doesn't contain any malicious content. I know that I can use functions like `htmlspecialchars()` to prevent cross-site scripting (XSS) attacks, but I'm not sure if that's enough.
So, my question is, what is the correct way to filter all the `$_POST` variables in PHP? Are there any specific functions or techniques I should be using? Additionally, could you also explain the importance of filtering user inputs and if there are any potential security risks if I don't properly filter the inputs?
I appreciate your help and any insights you can provide. Thanks in advance!