new pisilinux web sites

Internal/package-validation/CreditCard/LuhnAlgorithmInterface.php

@@ -0,0 +1,22 @@
+<?php namespace ZN\Validation\CreditCard;
+/**
+ * ZN PHP Web Framework
+ * 
+ * "Simplicity is the ultimate sophistication." ~ Da Vinci
+ * 
+ * @package ZN
+ * @license MIT [http://opensource.org/licenses/MIT]
+ * @author  Ozan UYKUN [ozan@znframework.com]
+ */
+
+interface LuhnAlgorithmInterface
+{   
+    /**
+     * Protected luhn algorithm check
+     * 
+     * @param string $number
+     * 
+     * @return string
+     */
+    public static function check(?string $number = NULL);
+}