From: Remi Collet <remi@php.net>
Date: Thu, 20 Mar 2014 14:18:41 +0000 (+0100)
Subject: add info: empty strings are interned
X-Git-Tag: PRE_PHPNG_MERGE~453^2~2^2
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7f7c84d64f2cb6a1d8ac84d15788310eac580289;p=php

add info: empty strings are interned
---

diff --git a/UPGRADING.INTERNALS b/UPGRADING.INTERNALS
index e8e0982042..474aed55f7 100644
--- a/UPGRADING.INTERNALS
+++ b/UPGRADING.INTERNALS
@@ -8,6 +8,7 @@ UPGRADE NOTES - PHP X.Y
   c. POST data handling
   d. Arginfo changes
   e. tsrm_virtual_cwd.h moved to zend_virtual_cwd.h
+  f. empty strings are interned
 
 2. Build system changes
   a. Unix build system changes
@@ -115,6 +116,13 @@ UPGRADE NOTES - PHP X.Y
 
   Memory allocation is now managed by emalloc/efree instead of malloc/free.
 
+  f. empty strings are interned
+
+  String created using STR_EMPTY_ALLOC() are now interned.
+  convert_to_string use STR_EMPTY_ALLOC() for zval when IS_NULL.
+  STR_FREE() shoud be prefered as efree on such strings can raise memory corruption.
+
+
 ========================
 2. Build system changes
 ========================