Stdlib: locale_get_default()/Locale without ext/intl — function_exists true, Zend false (ext/intl/php_intl.c, re-#9576)

[PurHur]

Category

stdlib · php-src-strict

Problem

Zend only registers locale_get_default(), locale_set_default(), and class Locale when ext/intl is loaded. On a typical CLI build without intl, function_exists('locale_get_default') is false. This compiler always exposes the symbols (VM-first #9576), so portable function_exists guards mis-detect intl availability.

Repro	Zend 8.2 (no intl)	VM (2026-07-04)
function_exists('locale_get_default')	false	true
class_exists('Locale')	false	true

Same class of bug as #11825 (grapheme_* without intl).

php-src reference

• php/php-src ext/intl/php_intl.c — module init registers locale API only with intl
• php/php-src ext/intl/locale/locale.c — Locale class

PHP implementation target

• ext/intl/Module.php — gate registration on intl/ICU availability flag matching Zend
• ext/intl/locale_get_default.php, Locale.php — keep PHP implementations; hide symbols when gated
• lib/VM/Reflection / function_exists path — respect module gate (no permanent stubs visible without intl)

Repro

./script/docker-exec.sh -- bash -lc 'php -r "var_export(function_exists('"'"'locale_get_default'"'"'));"'
./script/docker-exec.sh -- bash -lc 'php bin/vm.php -r "var_export(function_exists('"'"'locale_get_default'"'"'));"'
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_locale_get_default.php'

Done when

• Without intl/ICU: function_exists('locale_get_default') and class_exists('Locale') are false (match Zend)
• With intl enabled in compiler build: symbols work as today (Stdlib: locale_get_default()/locale_set_default() and Locale class missing (ext/intl/php_intl.c) #9576 behavior)
• Compliance guard under test/compliance/cases/intl/locale_gated.phpt
• php-src-strict; no php-compiler-strict shortcut

[PurHur]

claim: PHP Compiler STD Lib — starting this run

[PurHur]

Merged via #16224.

Fix: IntlExtensionPolicy::advertisesLocale() now returns ModuleRegistry::extensionLoaded('intl') — locale_get_default/locale_set_default/Locale are withheld from introspection without ext/intl, matching php-src and the existing grapheme_* policy.

Verification:

• VM repro test/repro/maintainer_locale_get_default.php → ok: absent
• Compliance test/compliance/cases/intl/locale_gated.phpt → fn=0, class=0
• AOT: php bin/compile.php -l green; function_exists('locale_get_default') → false in native binary