Merge pull request Chumper#309 from timgws/fix-collection-engine

Here's hoping that this fixes the CollectionEngine!

Author: Nils Plaschke

src/Chumper/Datatable/Engines/CollectionEngine.php

@@ -243,26 +243,31 @@ private function doInternalOrder()
             return;
 
         $column = $this->orderColumn[0];
+        $direction = $this->orderDirection[0];
         $stripOrder = $this->options['stripOrder'];
-        $self = $this;
-        $this->workingCollection->sortBy(function($row) use ($column,$stripOrder,$self) {
 
-            if($self->getAliasMapping())
+        $sortFunction = 'sortBy';
+        if ($direction == BaseEngine::ORDER_DESC)
+            $sortFunction = 'sortByDesc';
+
+        $this->workingCollection->{$sortFunction}(function($row) use ($column,$stripOrder) {
+
+            if($this->getAliasMapping())
             {
-                $column = $self->getNameByIndex($column);
+                $column = $this->getNameByIndex($column[0]);
+                return $row[$column];
             }
             if($stripOrder)
             {
                 return strip_tags($row[$column]);
             }
             else
             {
+                if (is_array($column))
+                    return $row[$column[0]];
                 return $row[$column];
             }
         });
-
-        if($this->orderDirection == BaseEngine::ORDER_DESC)
-            $this->workingCollection = $this->workingCollection->reverse();
     }
 
     private function compileArray($columns)