Merge branch 'hotfix/272'

Close #272

Author: michalbundyra

CHANGELOG.md

@@ -22,7 +22,9 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#272](https://github.com/zendframework/zend-validator/pull/272) changes
+  curly braces in array and string offset access to square brackets
+  in order to prevent issues under the upcoming PHP 7.4 release.
 
 ## 2.12.0 - 2019-01-30
 

src/Isbn/Isbn10.php

@@ -32,7 +32,7 @@ private function sum($value)
         $sum = 0;
 
         for ($i = 0; $i < 9; $i++) {
-            $sum += (10 - $i) * $value{$i};
+            $sum += (10 - $i) * $value[$i];
         }
 
         return $sum;

src/Isbn/Isbn13.php

@@ -33,11 +33,11 @@ private function sum($value)
 
         for ($i = 0; $i < 12; $i++) {
             if ($i % 2 == 0) {
-                $sum += $value{$i};
+                $sum += $value[$i];
                 continue;
             }
 
-            $sum += 3 * $value{$i};
+            $sum += 3 * $value[$i];
         }
 
         return $sum;