upgrade twig library

inc/lib/Twig/Extension/Core.php

@@ -348,7 +348,7 @@ function twig_random(Twig_Environment $env, $values = null)
         return $values < 0 ? mt_rand($values, 0) : mt_rand(0, $values);
     }
 
-    if ($values instanceof Traversable) {
+    if (is_object($values) && $values instanceof Traversable) {
         $values = iterator_to_array($values);
     } elseif (is_string($values)) {
         if ('' === $values) {
@@ -620,7 +620,7 @@ function twig_array_merge($arr1, $arr2)
  */
 function twig_slice(Twig_Environment $env, $item, $start, $length = null, $preserveKeys = false)
 {
-    if ($item instanceof Traversable) {
+    if (is_object($item) && $item instanceof Traversable) {
         $item = iterator_to_array($item, false);
     }
 
@@ -687,7 +687,7 @@ function twig_last(Twig_Environment $env, $item)
  */
 function twig_join_filter($value, $glue = '')
 {
-    if ($value instanceof Traversable) {
+    if (is_object($value) && $value instanceof Traversable) {
         $value = iterator_to_array($value, false);
     }
 
@@ -829,7 +829,7 @@ function twig_in_filter($value, $compare)
         }
 
         return false !== strpos($compare, (string) $value);
-    } elseif ($compare instanceof Traversable) {
+    } elseif (is_object($compare) && $compare instanceof Traversable) {
         return in_array($value, iterator_to_array($compare, false), is_object($value));
     }
 
@@ -1329,13 +1329,13 @@ function twig_constant($constant, $object = null)
  *
  * @param array   $items An array of items
  * @param integer $size  The size of the batch
- * @param string  $fill  A string to fill missing items
+ * @param mixed   $fill  A value used to fill missing items
  *
  * @return array
  */
 function twig_array_batch($items, $size, $fill = null)
 {
-    if ($items instanceof Traversable) {
+    if (is_object($items) && $items instanceof Traversable) {
         $items = iterator_to_array($items, false);
     }
 
@@ -1345,10 +1345,12 @@ function twig_array_batch($items, $size, $fill = null)
 
     if (null !== $fill) {
         $last = count($result) - 1;
-        $result[$last] = array_merge(
-            $result[$last],
-            array_fill(0, $size - count($result[$last]), $fill)
-        );
+        if ($fillCount = $size - count($result[$last])) {
+            $result[$last] = array_merge(
+                $result[$last],
+                array_fill(0, $fillCount, $fill)
+            );
+        }
     }
 
     return $result;