Support count_elements, the Countable::count internal representant

Author: carusogabriel

Zend/zend_API.c

@@ -4287,6 +4287,10 @@ ZEND_API zend_bool zend_is_countable(zval *countable) /* {{{ */
 		case IS_ARRAY:
 			return 1;
 		case IS_OBJECT:
+			if (Z_OBJ_HT_P(countable)->count_elements) {
+				return 1;
+			}
+
 			return instanceof_function(Z_OBJCE_P(countable), zend_ce_countable);
 		default:
 			return 0;