simplified code

src/Extension/CoreExtension.php

@@ -1686,30 +1686,18 @@ function twig_array_batch($items, $size, $fill = null, $preserveKeys = true)
     return $result;
 }
 
-if (\PHP_VERSION_ID < 50500) {
-    function twig_array_filter($array, $arrow)
-    {
-        if (\is_array($array)) {
-            if (\PHP_VERSION_ID >= 50600) {
-                return array_filter($array, $arrow, \ARRAY_FILTER_USE_BOTH);
-            }
-
-            return array_filter($array, $arrow);
+function twig_array_filter($array, $arrow)
+{
+    if (\is_array($array)) {
+        if (\PHP_VERSION_ID >= 50600) {
+            return array_filter($array, $arrow, \ARRAY_FILTER_USE_BOTH);
         }
 
-        while ($array instanceof \IteratorAggregate) {
-            $array = $array->getIterator();
-        }
-
-        // some internal PHP classes are \Traversable but do not implement \Iterator
-        if ($array instanceof \Iterator) {
-            return new \CallbackFilterIterator($array, $arrow);
-        }
-
-        throw new RuntimeException('The "filter" filter argument only supports objects implementing \Iterator; upgrade to PHP 5.5+.');
+        return array_filter($array, $arrow);
     }
-} else {
-    require_once __DIR__.'/twig_array_filter_55.php';
+
+    // the IteratorIterator wrapping is needed as some internal PHP classes are \Traversable but do not implement \Iterator
+    return new \CallbackFilterIterator(new \IteratorIterator($array), $arrow);
 }
 
 function twig_array_map($array, $arrow)

src/Extension/twig_array_filter_55.php

@@ -1,10 +0,0 @@
-<?php
-
-function twig_array_filter($array, $arrow)
-{
-    foreach ($array as $k => $v) {
-        if ($arrow($v, $k)) {
-            yield $k => $v;
-        }
-    }
-}