URI的获取，兼容文件存在于子目录

据说$_SERVER['REQUEST_URI']只能在Apache才可以用（没测试过），所以只兼容Apache。

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

返回值： Hello/World


设置.htaccess后：

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

返回值： Hello/World

$requestURI = trim($_SERVER['REQUEST_URI'],'/');
$appPath = trim(dirname($_SERVER['SCRIPT_NAME']),'/');//获取所在目录
$fileName = trim(str_replace(dirname($_SERVER['SCRIPT_NAME']),'', $_SERVER['SCRIPT_NAME']),'/');//获取文件名称

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

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