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Internal/package-validation/CreditCard/LuhnAlgorithm.php

@@ -0,0 +1,38 @@
+<?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]
+ */
+
+class LuhnAlgorithm implements LuhnAlgorithmInterface
+{   
+    /**
+     * Protected luhn algorithm check
+     * 
+     * @param string $number
+     * 
+     * @return string
+     */
+    public static function check(?string $number = NULL)
+    {
+        $table = 
+        [
+			[0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
+			[0, 2, 4, 6, 8, 1, 3, 5, 7, 9]
+		];
+
+		$total = 0; $transform = 0;
+
+		for( $i = strlen($number ?? '') - 1; $i >= 0; $i-- )
+		{
+			$total += $table[$transform++ & 0x1][$number[$i]];
+		}
+
+		return $total % 10 === 0;
+    }
+}