diff --git a/src/Valitron/Validator.php b/src/Valitron/Validator.php
index cea357b..d92e2e6 100644
--- a/src/Valitron/Validator.php
+++ b/src/Valitron/Validator.php
@@ -509,29 +509,29 @@ class Validator
          * @return bool
          */
         $numberIsValid = function () use ($value) {
-        $number = preg_replace('/[^0-9]+/', '', $value);
-        $sum = 0;
+            $number = preg_replace('/[^0-9]+/', '', $value);
+            $sum = 0;
 
-        $strlen = strlen($number);
-        if ($strlen < 13) {
-            return false;
-        }
-        for ($i = 0; $i < $strlen; $i++) {
-            $digit = (int) substr($number, $strlen - $i - 1, 1);
-            if ($i % 2 == 1) {
-                $sub_total = $digit * 2;
-                if ($sub_total > 9) {
-                    $sub_total = ($sub_total - 10) + 1;
-                }
-            } else {
-                $sub_total = $digit;
+            $strlen = strlen($number);
+            if ($strlen < 13) {
+                return false;
             }
-            $sum += $sub_total;
-        }
-        if ($sum > 0 && $sum % 10 == 0) {
-                return true;
-        }
-            return false;
+            for ($i = 0; $i < $strlen; $i++) {
+                $digit = (int) substr($number, $strlen - $i - 1, 1);
+                if ($i % 2 == 1) {
+                    $sub_total = $digit * 2;
+                    if ($sub_total > 9) {
+                        $sub_total = ($sub_total - 10) + 1;
+                    }
+                } else {
+                    $sub_total = $digit;
+                }
+                $sum += $sub_total;
+            }
+            if ($sum > 0 && $sum % 10 == 0) {
+                    return true;
+            }
+                return false;
         };
 
         if ($numberIsValid()) {
diff --git a/tests/Valitron/ValidateTest.php b/tests/Valitron/ValidateTest.php
index f66e61a..b13aa9c 100644
--- a/tests/Valitron/ValidateTest.php
+++ b/tests/Valitron/ValidateTest.php
@@ -657,11 +657,11 @@ class ValidateTest extends BaseTestCase
 
     public function testCreditCardValid()
     {
-        $visa         = [4539511619543489, 4532949059629052, 4024007171194938, 4929646403373269, 4539135861690622];
-        $mastercard   = [5162057048081965, 5382687859049349, 5484388880142230, 5464941521226434, 5473481232685965];
-        $amex         = [371442067262027, 340743030537918, 345509167493596, 343665795576848, 346087552944316];
-        $dinersclub   = [30363194756249, 30160097740704, 38186521192206, 38977384214552, 38563220301454];
-        $discover     = [6011712400392605, 6011536340491809, 6011785775263015, 6011984124619056, 6011320958064251];
+        $visa         = array(4539511619543489, 4532949059629052, 4024007171194938, 4929646403373269, 4539135861690622);
+        $mastercard   = array(5162057048081965, 5382687859049349, 5484388880142230, 5464941521226434, 5473481232685965);
+        $amex         = array(371442067262027, 340743030537918, 345509167493596, 343665795576848, 346087552944316);
+        $dinersclub   = array(30363194756249, 30160097740704, 38186521192206, 38977384214552, 38563220301454);
+        $discover     = array(6011712400392605, 6011536340491809, 6011785775263015, 6011984124619056, 6011320958064251);
 
         foreach (compact('visa', 'mastercard', 'amex', 'dinersclub', 'discover') as $type => $numbers) {
             foreach($numbers as $number) {
@@ -674,18 +674,18 @@ class ValidateTest extends BaseTestCase
                 $this->assertTrue($v->validate());
                 $v->rule('creditCard', 'test', $type, [$type, 'mastercard', 'visa']);
                 $this->assertTrue($v->validate());
-                unset($d);
+                unset($v);
             }
         }
     }
 
     public function testcreditCardInvalid()
     {
-        $visa         = [3539511619543489, 3532949059629052, 3024007171194938, 3929646403373269, 3539135861690622];
-        $mastercard   = [4162057048081965, 4382687859049349, 4484388880142230, 4464941521226434, 4473481232685965];
-        $amex         = [271442067262027, 240743030537918, 245509167493596, 243665795576848, 246087552944316];
-        $dinersclub   = [20363194756249, 20160097740704, 28186521192206, 28977384214552, 28563220301454];
-        $discover     = [5011712400392605, 5011536340491809, 5011785775263015, 5011984124619056, 5011320958064251];
+        $visa         = array(3539511619543489, 3532949059629052, 3024007171194938, 3929646403373269, 3539135861690622);
+        $mastercard   = array(4162057048081965, 4382687859049349, 4484388880142230, 4464941521226434, 4473481232685965);
+        $amex         = array(271442067262027, 240743030537918, 245509167493596, 243665795576848, 246087552944316);
+        $dinersclub   = array(20363194756249, 20160097740704, 28186521192206, 28977384214552, 28563220301454);
+        $discover     = array(5011712400392605, 5011536340491809, 5011785775263015, 5011984124619056, 5011320958064251);
 
         foreach (compact('visa', 'mastercard', 'amex', 'dinersclub', 'discover') as $type => $numbers) {
             foreach($numbers as $number) {
@@ -702,7 +702,7 @@ class ValidateTest extends BaseTestCase
                 $this->assertFalse($v->validate());
                 $v->rule('creditCard', 'test', 'invalidCardName', ['invalidCardName', 'mastercard', 'visa']);
                 $this->assertFalse($v->validate());
-                unset($d);
+                unset($v);
             }
         }
     }