adding

app/FileManager.php

@@ -47,25 +47,23 @@ class FileManager
             ];
 
             if ($result['is_file']) {
-                $result['size'] = $this->formatBytes($meta['size']);
+                $result['meta']['size'] = $this->formatBytes($meta['size']);
                 $files[] = $result;
             } else {
                 $directories[] = $result;
             }
         }
 
-        usort($directories, function($a, $b) {
-            if (strtolower($a['filename']) < strtolower($b['filename'])) {
-                return 0;
-            } else {
-                return 1;
-            }
-        });
+        // sorting by filename
+        usort($directories, [$this, 'sortByFilename']);
+        usort($files, [$this, 'sortByFilename']);
 
+        // adding directories
         foreach($directories as $directory) {
             $results[] = $directory;
         }
 
+        //  adding files
         foreach($files as $file) {
             $results[] = $file;
         }
@@ -73,6 +71,19 @@ class FileManager
         return $results;
     }
 
+    /**
+     *  sorting by filename, function for usort 
+     *
+     */
+    private function sortByFilename($a, $b)
+    {
+        if (strtolower($a['filename']) < strtolower($b['filename'])) {
+            return 0;
+        } else {
+            return 1;
+        }
+    }
+
     /**
      *
      *  @param  [type]  $size      [description]