mbstring: updating NEWS and UPGRADING for changed behavior of ini_set() with mbstring.detect_order

Author: Tobias Vorwachs

NEWS

@@ -20,6 +20,10 @@ PHP                                                                        NEWS
   . Fixed bug GH-20483 (ASAN stack overflow with fiber.stack_size INI
     small value). (David Carlier)
 
+- Mbstring:
+  . ini_set() with mbstring.detect_order changes the order of mb_detect_order
+    as intended, since mbstring.detect_order is an INI_ALL setting. (tobee94)
+
 - Opcache:
   . Fixed bug GH-20051 (apache2 shutdowns when restart is requested during
     preloading). (Arnaud, welcomycozyhom)

UPGRADING

@@ -98,6 +98,13 @@ PHP 8.6 UPGRADE NOTES
     When used along with ZEND_JIT_DEBUG_TRACE_EXIT_INFO, the source of exit
     points is printed in exit info output, in debug builds.
 
+- Mbstring:
+  . The mbstring.detect_order INI directive now updates the internal detection
+    order when changed at runtime via ini_set(). Previously, runtime changes
+    using ini_set() did not take effect for mb_detect_order(). Setting the
+    directive to NULL or an empty string at runtime now leaves the previously
+    configured detection order unchanged.
+
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 12. Windows Support
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