slim can't catch an options array well formed by html (+twig) named sel [ ].

myroute.php

	// insert
	  $app->post('/insvei1',function () use ($app) {
		include_once('includes/menu.php');

		$id = $app->request()->post('idvei');		
		$sel = $app->request()->post('sel[]');		

		$conn = new MongoClient('mongodb://localhost');
		$db = $conn->tasks;
		$collection = $db->manupcars;
		$document = array( 
	           "idcar" => new MongoId($id),
	           "idman" => new MongoId($sel)
	    );
	    $collection->insert($document);
 	    $link = $app->urlFor('mpclist');
		$app->redirect($link);
	});