fixed the in operator for objects that contains circular references (c…

…loses twigphp#813)

lib/Twig/Extension/Core.php

@@ -745,16 +745,18 @@ function twig_sort_filter($array)
 /* used internally */
 function twig_in_filter($value, $compare)
 {
+    $strict = is_object($value);
+
     if (is_array($compare)) {
-        return in_array($value, $compare);
+        return in_array($value, $compare, $strict);
     } elseif (is_string($compare)) {
         if (!strlen((string) $value)) {
             return empty($compare);
         }
 
         return false !== strpos($compare, (string) $value);
     } elseif (is_object($compare) && $compare instanceof Traversable) {
-        return in_array($value, iterator_to_array($compare, false));
+        return in_array($value, iterator_to_array($compare, false), $strict);
     }
 
     return false;

test/Twig/Tests/Fixtures/tests/in_with_objects.test

@@ -0,0 +1,19 @@
+--TEST--
+Twig supports the in operator when using objects
+--TEMPLATE--
+{% if object in object_list %}
+TRUE
+{% endif %}
+--DATA--
+$foo = new Foo();
+$foo1 = new Foo();
+
+$foo->position = $foo1;
+$foo1->position = $foo;
+
+return array(
+    'object'      => $foo,
+    'object_list' => array($foo1, $foo),
+);
+--EXPECT--
+TRUE