PHP - Routing not working in subfolder sites

Question

I am trying to create a php project. At the time of routing the url routing works perfect with virtualhost domain. But the functionality doesn't work properly when I placed my project inside a subfolder. My Router Class looks like

 class Router{
    private $request;
    public function __construct($request){
        $this->request = $request;
    }
    public function get($route, $file){
        $uri = trim( $this->request, "/" );
        $uri = explode("/", $uri);
        if (empty($uri[0])) {
            $file['platform'] = '';
            $file['controller'] = 'Index';
            $file['action'] = 'index';
        }
        if($uri[0] == trim($route, "/")){
            define("PLATFORM", isset($file['platform']) ? $file['platform'] : '');
            define("CONTROLLER", isset($file['controller']) ? $file['controller'] : 'Index');
            define("ACTION", isset($file['action']) ? $file['action'] : 'index');
            $plarform = !empty(PLATFORM)? PLATFORM . DS: '';
            define("CURRENT_CONTROLLER", CONTROLLER_PATH . $plarform);
            define("CURRENT_VIEW", VIEW_PATH . PLATFORM . DS);
        }
    }
}

And initialize the function like

require CORE_PATH.'Router.php';
$request = $_SERVER['REQUEST_URI'];
$router = new Router($request);

But the same work in

http://www.mysite.local, http://www.mysite.local/about, http://www.mysite.local/contact

which is a virtualhost.

But When I call something like

http://localhost/mysite/, http://localhost/mysite/about, http://localhost/mysite/contact

it doesn't work as I expect. Please suggest me any idea to working on this.

My .htaccess as like below.

<IfModule mod_rewrite.c>
    Options +FollowSymLinks
    RewriteEngine on
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.*)$ index.php/$1 [L]
</IfModule>

I have already tried with

RewriteBase /mysite

Answer 1

Ya Finally I got a solution after working on it. I just changed $_SERVER['REQUEST_URI']; to $SERVER['PHP_SELF'];.

There is an index.php in the $SERVER['PHP_SELF'];. That is if URL is http://www.mysite.local/about actual PHP_SELF is

http://www.mysite.local/index.php/about

Same as in

http://localhost/mysite/index.php/about

So I Just explode the siteurl with index.php as below.

    require CORE_PATH.'Router.php';
    $request = $_SERVER['PHP_SELF'];
    $requesturi = explode('index.php', $request);
    unset($requesturi[0]);
    $request = implode($requesturi);
    $router = new Router($request);