Note the change in ob_start() chunk size behaviour mentioned in doc bug #60243

(Add way to specify output buffering chunk size of 1).

diff --git a/UPGRADING b/UPGRADING
index eb871a8037b753c49019bdc5d4bb360f4f2ababf..17f630a0cd2636ab30edf7c0bf745f94017f81f2 100755 (executable)
--- a/UPGRADING
+++ b/UPGRADING
@@ -225,6 +225,8 @@ UPGRADE NOTES - PHP 5.4
 - is_a() and is_subclass_of() now have third boolean parameter, which specifies
   if the first argument can be a string class name. Default if false for is_a
   and true for is_subclass_of() for BC reasons.
+- ob_start() will now treat a chunk size of 1 as meaning 1 byte, rather than
+  the previous special case behaviour of treating it as 4096 bytes.
 
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 5. Changes made to existing methods