Merge branch 'hotfix/170-extras-for-compact-op' into develop

Forward port #170

Author: weierophinney

CHANGELOG.md

@@ -44,6 +44,9 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
+- [#170](https://github.com/zendframework/zend-view/pull/170) ensures that variables referenced in `compact()` operations are properly
+  initialized, fixing an error that occures in PHP 7.3.
+
 - [#169](https://github.com/zendframework/zend-view/pull/169) adds zendframework/zend-json as a required dependency, as it is referenced
   in multiple locations within the package.
 

src/Helper/HeadLink.php

@@ -408,6 +408,8 @@ public function createDataStylesheet(array $args)
         if ($args && is_array($args[0])) {
             $extras = array_shift($args);
             $extras = (array) $extras;
+        } else {
+            $extras = array();
         }
 
         $attributes = compact('rel', 'type', 'href', 'media', 'conditionalStylesheet', 'extras');
@@ -460,6 +462,8 @@ public function createDataAlternate(array $args)
             if (isset($extras['media']) && is_array($extras['media'])) {
                 $extras['media'] = implode(',', $extras['media']);
             }
+        } else {
+            $extras = array();
         }
 
         $href  = (string) $href;