$get = explode('&', $_POST['seri'] ); // explode with and

        foreach ( $get as $key => $value) {
          $need[ substr( $value, 0 , strpos( $value, '=' ) ) ] =  substr( $value, strpos( $value, '=' ) + 1 ) ;
        }
// access your query param name=ddd&email=aaaaa&username=wwwww&password=wwww&password=eeee
     var_dump( $need['name'] );