Obtaining URI, compatible files exist in subdirectories

It is said that $_SERVER['REQUEST_URI'] can only be used in Apache (not tested), so it is only compatible with Apache.

http://example.com/URIRouter.php/Hello/World
or
http://example.com/dir/URIRouter.php/Hello/World

Return value: Hello/World


After setting .htaccess:

http://example.com/Hello/World
or
http://example.com/dir/Hello/World

Return value: Hello/World

$requestURI = trim($_SERVER['REQUEST_URI'],'/');
$appPath = trim(dirname($_SERVER['SCRIPT_NAME']),'/');//Get the directory
 $fileName = trim(str_replace(dirname($_SERVER['SCRIPT_NAME']),'', $_SERVER['SCRIPT_NAME']),'/');//Get the file name

echo trim(str_replace($fileName, '',trim(str_replace($appPath,'',$requestURI),'/')),'/');

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ URIRouter.php [QSA,L]