[5.5] groupBy method in collection to support multiple levels#22630

Merged

taylorotwell merged 1 commit intolaravel:5.5from patriziotomato:collection-groupby-multilevel

Jan 4, 2018

Commits on Jan 4, 2018

Let groupBy method in collection support multiple levels by allowing to groupBy an array, each element applies for an level in the returned collection.
patriziotomato
committed