Superglobals和htmlentities

Question

I was reading about Superglobals and security. As a “rule”, I use htmlentities() for all the inputs and similar and for

$_SERVER['HTTP_REFERER']; 
$_SERVER["REQUEST_METHOD"];
$_POST['thename'];
$_GET['thename'];

But since I am a novice I don´t know if I have to use it with some or all the other superglobals. I don´t know about security and maybe, someone can do “something” to put (or change) malicious code.

Do I have to use it just for those ones? Or are others to consider?

Thanks a lot.

I´m asking to learn in the good way.

Answer 1

Don't use htmlentities(), use htmlspecialchars().

And use that function whenever you have some plain text that should be inserted into HTML. This is without exception - always do it. It has nothing to do with security in the first place, it is simply the way to achieve correct text output.

Other functions you should be using: urlencode() or rawurlencode().