Move custom libs to the source tree

libs/SimpleValidator/Validators/InArray.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace SimpleValidator\Validators;
+
+class InArray extends Base
+{
+    protected $array;
+
+    public function __construct($field, array $array, $error_message)
+    {
+        parent::__construct($field, $error_message);
+        $this->array = $array;
+    }
+
+    public function execute(array $data)
+    {
+        if ($this->isFieldNotEmpty($data)) {
+            return in_array($data[$this->field], $this->array);
+        }
+
+        return true;
+    }
+}