diff --git a/NEWS b/NEWS
index 5ca72be50643..0817b78f6598 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,9 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-?? ??? ????, PHP 8.6.0beta2
+?? ??? ????, PHP 8.6.0beta3
+
+
+27 Aug 2026, PHP 8.6.0beta2
 
 - Core:
   . Fixed bug GH-15375 (Nested "yield from" skips items after a valid() or
diff --git a/UPGRADING b/UPGRADING
index 4a5d055a57c4..f3b4ed8b99fa 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -652,6 +652,12 @@ PHP 8.6 UPGRADE NOTES
 - Phar:
   . Phar::mungServer() now supports reference values.
 
+- Readline:
+  . readline_completion_function() now declares true as its return type. The
+    function assigns a static callback and then tests whether the assignment
+    landed, which is a tautology; an invalid callback throws a TypeError via
+    ZPP before the function body is reached.
+
 - Sockets:
   . socket_addrinfo_lookup() now has an additional optional argument $error
     when not null, and on failure, gives the error code (one of the EAI_*
@@ -664,6 +670,9 @@ PHP 8.6 UPGRADE NOTES
   . header_register_callback() now declares true as its return type. It has not
     been able to return false since PHP 8.0.0, where passing an invalid
     callback started throwing a TypeError instead.
+  . register_tick_function() now declares true as its return type. It has
+    always returned true on success; an invalid callback throws a TypeError
+    via ZPP before the function body is reached.
   . ini_get_all() now includes a "builtin_default_value" element for each
     directive when $details is true. It holds the built-in default value of the
     directive (or null if it has none), independent of values set in php.ini,
diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index cbc0ebdd8713..d9ec274996c7 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -489,8 +489,8 @@ PHP_FUNCTION(readline_completion_function)
 
 	/* NOTE: The rl_attempted_completion_function variable (and others) are part of the readline library, not php */
 	rl_attempted_completion_function = php_readline_completion_cb;
-	
-	RETURN_BOOL(rl_attempted_completion_function != NULL);
+
+	RETURN_TRUE;
 }
 
 /* }}} */
diff --git a/ext/readline/readline.stub.php b/ext/readline/readline.stub.php
index be445df21415..4dae1237c605 100644
--- a/ext/readline/readline.stub.php
+++ b/ext/readline/readline.stub.php
@@ -29,7 +29,7 @@ function readline_read_history(?string $filename = null): bool {}
 
 function readline_write_history(?string $filename = null): bool {}
 
-function readline_completion_function(callable $callback): bool {}
+function readline_completion_function(callable $callback): true {}
 
 
 #ifdef HAVE_RL_CALLBACK_READ_CHAR
diff --git a/ext/readline/readline_arginfo.h b/ext/readline/readline_arginfo.h
index 689d5f762eef..1ce08c443eeb 100644
--- a/ext/readline/readline_arginfo.h
+++ b/ext/readline/readline_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit readline.stub.php instead.
- * Stub hash: 7a314f75d9a89a9ea4d525515bb6bacdf7be6746 */
+ * Stub hash: 848e798481f62ee09cfd8cc3dfa6b0814cfdd979 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_readline, 0, 0, MAY_BE_STRING|MAY_BE_FALSE)
 	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, prompt, IS_STRING, 1, "null")
@@ -28,7 +28,7 @@ ZEND_END_ARG_INFO()
 
 #define arginfo_readline_write_history arginfo_readline_read_history
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_readline_completion_function, 0, 1, _IS_BOOL, 0)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_readline_completion_function, 0, 1, IS_TRUE, 0)
 	ZEND_ARG_TYPE_INFO(0, callback, IS_CALLABLE, 0)
 ZEND_END_ARG_INFO()
 
diff --git a/ext/standard/basic_functions.stub.php b/ext/standard/basic_functions.stub.php
index 42cb711512b8..3e23934cbc78 100644
--- a/ext/standard/basic_functions.stub.php
+++ b/ext/standard/basic_functions.stub.php
@@ -2063,7 +2063,7 @@ function getprotobyname(string $protocol): int|false {}
 function getprotobynumber(int $protocol): string|false {}
 #endif
 
-function register_tick_function(callable $callback, mixed ...$args): bool {}
+function register_tick_function(callable $callback, mixed ...$args): true {}
 
 function unregister_tick_function(callable $callback): void {}
 
diff --git a/ext/standard/basic_functions_arginfo.h b/ext/standard/basic_functions_arginfo.h
index a057d3d48be3..442085e9d6cc 100644
--- a/ext/standard/basic_functions_arginfo.h
+++ b/ext/standard/basic_functions_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit basic_functions.stub.php instead.
- * Stub hash: 13b6fd340958d1a7c782c8f5f3685517e62e5edc
+ * Stub hash: c645e310c00d9f4cb3856c94ee60d06071e28de0
  * Has decl header: yes */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
@@ -574,7 +574,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_getprotobynumber, 0, 1, MAY_BE_S
 ZEND_END_ARG_INFO()
 #endif
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_register_tick_function, 0, 1, _IS_BOOL, 0)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_register_tick_function, 0, 1, IS_TRUE, 0)
 	ZEND_ARG_TYPE_INFO(0, callback, IS_CALLABLE, 0)
 	ZEND_ARG_VARIADIC_TYPE_INFO(0, args, IS_MIXED, 0)
 ZEND_END_ARG_INFO()
diff --git a/ext/standard/basic_functions_decl.h b/ext/standard/basic_functions_decl.h
index ab0a8ec94f7b..f2f234f60cc2 100644
--- a/ext/standard/basic_functions_decl.h
+++ b/ext/standard/basic_functions_decl.h
@@ -1,8 +1,8 @@
 /* This is a generated file, edit basic_functions.stub.php instead.
- * Stub hash: 13b6fd340958d1a7c782c8f5f3685517e62e5edc */
+ * Stub hash: c645e310c00d9f4cb3856c94ee60d06071e28de0 */
 
-#ifndef ZEND_BASIC_FUNCTIONS_DECL_13b6fd340958d1a7c782c8f5f3685517e62e5edc_H
-#define ZEND_BASIC_FUNCTIONS_DECL_13b6fd340958d1a7c782c8f5f3685517e62e5edc_H
+#ifndef ZEND_BASIC_FUNCTIONS_DECL_c645e310c00d9f4cb3856c94ee60d06071e28de0_H
+#define ZEND_BASIC_FUNCTIONS_DECL_c645e310c00d9f4cb3856c94ee60d06071e28de0_H
 
 typedef enum zend_enum_SortDirection {
 	ZEND_ENUM_SortDirection_Ascending = 1,
@@ -20,4 +20,4 @@ typedef enum zend_enum_RoundingMode {
 	ZEND_ENUM_RoundingMode_PositiveInfinity = 8,
 } zend_enum_RoundingMode;
 
-#endif /* ZEND_BASIC_FUNCTIONS_DECL_13b6fd340958d1a7c782c8f5f3685517e62e5edc_H */
+#endif /* ZEND_BASIC_FUNCTIONS_DECL_c645e310c00d9f4cb3856c94ee60d06071e28de0_H */