Use BoardFormatter to generate the board

tests/units/FunctionTest.php

@@ -0,0 +1,21 @@
+<?php
+
+require_once __DIR__.'/Base.php';
+
+class FunctionTest extends Base
+{
+    public function testArrayColumnSum()
+    {
+        $input = array(
+            array(
+                'my_column' => 123
+            ),
+            array(
+                'my_column' => 456.7
+            ),
+            array()
+        );
+
+        $this->assertSame(579.7, array_column_sum($input, 'my_column'));
+    }
+}