I want to pass data from url without using GET and display on the page using PHP

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PHP

Hi there, I want to passing data like firstname for example http://mywebsite.com/erick instead of using http://mywebsite.com/index.php?name=erick, and display the firstname on the page. Anyone know how to do that please I need help.

What I have tried:

<?php

if($_GET["name"]){

print $_GET["name"];

}
else{ print "Welcome, Guest"; }

?>