ext/standard: change highlight_string()/print_r stub return type from string|bool to string|true (#14959)

* ext/standard: change `highlight_string()` return type from `string|bool` to `string|true`

* ext/standard: change `print_r` return type from `string|bool` to `string|true`

Author: Ayesh

UPGRADING

@@ -565,6 +565,8 @@ PHP 8.4 UPGRADE NOTES
     one digit.
   . output_add_rewrite_var() now uses url_rewriter.hosts instead of
     session.trans_sid_hosts for selecting hosts that will be rewritten.
+  . highlight_string() now has a return type of string|true instead of string|bool.
+  . print_r() now has a return type of string|true instead of string|bool.
 
 ========================================
 6. New Functions

Zend/Optimizer/zend_func_infos.h

@@ -456,11 +456,11 @@ static const func_info_t func_infos[] = {
 	F1("error_get_last", MAY_BE_ARRAY|MAY_BE_ARRAY_KEY_STRING|MAY_BE_ARRAY_OF_LONG|MAY_BE_ARRAY_OF_STRING|MAY_BE_NULL),
 	F1("highlight_file", MAY_BE_STRING|MAY_BE_BOOL),
 	F1("php_strip_whitespace", MAY_BE_STRING),
-	F1("highlight_string", MAY_BE_STRING|MAY_BE_BOOL),
+	F1("highlight_string", MAY_BE_STRING|MAY_BE_TRUE),
 	F1("ini_get_all", MAY_BE_ARRAY|MAY_BE_ARRAY_KEY_STRING|MAY_BE_ARRAY_OF_STRING|MAY_BE_ARRAY_OF_ARRAY|MAY_BE_ARRAY_OF_NULL|MAY_BE_FALSE),
 	F1("set_include_path", MAY_BE_STRING|MAY_BE_FALSE),
 	F1("get_include_path", MAY_BE_STRING|MAY_BE_FALSE),
-	F1("print_r", MAY_BE_STRING|MAY_BE_BOOL),
+	F1("print_r", MAY_BE_STRING|MAY_BE_TRUE),
 #if defined(HAVE_GETSERVBYPORT)
 	F1("getservbyport", MAY_BE_STRING|MAY_BE_FALSE),
 #endif

ext/standard/basic_functions.stub.php

@@ -2024,7 +2024,7 @@ function show_source(string $filename, bool $return = false): string|bool {}
 function php_strip_whitespace(string $filename): string {}
 
 /** @refcount 1 */
-function highlight_string(string $string, bool $return = false): string|bool {}
+function highlight_string(string $string, bool $return = false): string|true {}
 
 function ini_get(string $option): string|false {}
 
@@ -2050,7 +2050,7 @@ function set_include_path(string $include_path): string|false {}
 function get_include_path(): string|false {}
 
 /** @refcount 1 */
-function print_r(mixed $value, bool $return = false): string|bool {}
+function print_r(mixed $value, bool $return = false): string|true {}
 
 function connection_aborted(): int {}