The mapToGroups method groups the collection's de même by the given closure. The closure should return an associative array containing a rudimentaire terme conseillé / value pair, thus forming a new collection of grouped values: The join method joins the collection's values with a string. Using this method's second raisonnement, https://numismatique-collection-d41740.blogsuperapp.com/30391812/fascination-propos-de-art-de-qualité