are $_post and $_get redundant?

are $_post and $_get redundant?
PHP seems to be able to automatically get the data for a post or GET request, without having to use a $_post or $_get array to get it. For example:
$userName =$_post["UserName"];
$PS =$_post["PS"];
echo "The user name you entered is:". $userName;
echo "
The password you entered is: ". $PS;
?>
Even if the code $_post those two lines out still can get to the form data, then I think $_post and $_get is redundant, and I think this is the biggest difference between PHP and ASP, ASP without request collection is absolutely not get

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------Solution--------------------
That's because you opened the register_globals. But Register_globals is to be turned off to be safe, you write code like this, not good.
------Solution--------------------
Which website did you open the register_globals?

I'm going to have a text
Xxx.php?username=abc&ps=1
xxx.php?username=abc&ps=2
Xxx.php?username=abc&ps=3
......
xxx.php?username=abc&ps=999999

This is more convenient than 999,999 post, although post is not difficult
If you have a post, upload something that's more fun.

