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what is the difference between $_SERVER['REQUEST_URI'] and $_GET['q'] (which is used in Drupal)?
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$_SERVER['REQUEST_URI'] contains the URI of the current page. So if the full path of a page is https://www.w3resource.com/html/html-tutorials.php, $_SERVER['REQUEST_URI'] would contain /html/html-tutorials. php.
$_SERVER['PHP_SELF'] Returns the filename of the currently executing script. $_SERVER['GATEWAY_INTERFACE'] Returns the version of the Common Gateway Interface (CGI) the server is using.
$_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here.
In cases where you do need it, the answer is that yes, REQUEST_URI is safe.
Given this example url:
http://www.example.com/some-dir/yourpage.php?q=bogus&n=10
$_SERVER['REQUEST_URI'] will give you:
/some-dir/yourpage.php?q=bogus&n=10
Whereas $_GET['q'] will give you:
bogus
In other words, $_SERVER['REQUEST_URI'] will hold the full request path including the querystring. And $_GET['q'] will give you the value of parameter q in the querystring.
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