[ci skip] Document new typedef zif_handler

diff --git a/UPGRADING.INTERNALS b/UPGRADING.INTERNALS
index e7973c11b0847885459425e428d9559d933fe1af..d110589b02529fa6c656c71fecd383074702ccb2 100644 (file)
--- a/UPGRADING.INTERNALS
+++ b/UPGRADING.INTERNALS
@@ -20,6 +20,7 @@ PHP 7.3 INTERNALS UPGRADE NOTES
   q. sapi_cli_single_write()
   r. php_url
   s. zend_function.reserved[]
+  t. zif_handler
 
 2. Build system changes
   a. Unix build system changes
@@ -134,6 +135,9 @@ PHP 7.3 INTERNALS UPGRADE NOTES
     ZEND_ACC_FAKE_CLOSURE flags use reserved[0] for internal purpose.
     Third party extensions must not modify reserved[] fields of these functions.
 
+ t. For internal functions the typedef zif_handler has been introduced.  It is
+    recommended to use this from now on, instead of defining own handler types.
+
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 2. Build system changes
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