ext/spl: Follow-up on GH-9704

NEWS

@@ -38,6 +38,11 @@ PHP                                                                        NEWS
   . INI settings session.sid_length and session.sid_bits_per_character are now
     deprecated. (timwolla)
 
+- SPL:
+  . The SplFixedArray::__wakeup() method has been deprecated as it implements
+    __serialize() and __unserialize() which need to be overwritten instead.
+    (TysonAndre)
+
 - Standard:
   . Unserializing the uppercase 'S' tag is now deprecated. (timwolla)
 

UPGRADING

@@ -463,6 +463,10 @@ PHP 8.4 UPGRADE NOTES
     hexadecimal session IDs and stop changing these two INI settings.
     RFC: https://wiki.php.net/rfc/deprecations_php_8_4
 
+- SPL:
+  . The SplFixedArray::__wakeup() method has been deprecated as it implements
+    __serialize() and __unserialize() which need to be overwritten instead.
+
 - Standard:
   . Calling stream_context_set_option() with 2 arguments is deprecated.
     Use stream_context_set_options() instead.

ext/spl/spl_fixedarray.c

@@ -22,6 +22,7 @@
 #include "php.h"
 #include "zend_interfaces.h"
 #include "zend_exceptions.h"
+#include "zend_attributes.h"
 
 #include "spl_fixedarray_arginfo.h"
 #include "spl_fixedarray.h"

ext/spl/spl_fixedarray.stub.php

@@ -6,10 +6,8 @@ class SplFixedArray implements IteratorAggregate, ArrayAccess, Countable, JsonSe
 {
     public function __construct(int $size = 0) {}
 
-    /**
-     * @tentative-return-type
-     * @deprecated
-     */
+    /** @tentative-return-type */
+    #[\Deprecated(since: '8.4', message: 'this method is obsolete, as serialization hooks are provided by __unserialize() and __serialize()')]
     public function __wakeup(): void {}
 
     public function __serialize(): array {}