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Language: enum type constants — public const on enum declaration missing (PHP 8.3) #6590
Description
Category
language · PHP 8.3 enum constants
Problem
PHP 8.3+ allows typed constants on enum declarations separate from cases:
enum E: string {
case A = 'a';
public const X = 'meta';
}
echo E::X; // "meta"Zend resolves E::X at compile/runtime. This compiler reports Undefined class constant E::X (fatal) — enum-level constants are not materialized.
Verified probe (2026-06-06):
| Call | Zend PHP 8.2 | VM (today) |
|---|---|---|
enum E: string { case A="a"; public const X="x"; } echo E::X; |
x |
Fatal error: Undefined class constant E::X |
php-src reference
- php/php-src
Zend/zend_enum.c— enum constant table - php/php-src
Zend/zend_compile.c—zend_compile_enumconstant registration
Repro
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
php bin/vm.php -r "enum E: string { case A=\"a\"; public const X=\"x\"; } echo E::X;"'Scope
| Module | Path |
|---|---|
| Compiler | enum compile — register non-case constants on enum scope |
| VM | FETCH_CLASS_CONSTANT / enum symbol table for E::X |
| JIT/AOT | enum constant fetch lowering |
| Tests | test/compliance/cases/language/enum_type_constant.phpt |
Done when
public const(andprivate/protectedwhere valid) on enums resolve like Zendconstant('E::X'),defined('E::X'), and reflection can see enum constants (follow-up ok in separate reflection issue if needed)- Case constants (
case A = 1) unchanged
Verification
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter enum_type_constant'
Activity
PurHur commentedon Jun 6, 2026
claim: worker-lane-c — starting this run
Add enum type constant compliance coverage for #6590. (#6599)
PurHur commentedon Jun 6, 2026
Merged via #6599.
Enum `public const` on backed enums already resolves on VM/JIT (landed with #6407 / #6415). This run added the missing compliance guard and maintainer repro from the issue acceptance criteria.
Verification
```bash
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && vendor/bin/phpunit --filter enum_type_constant'
OK (2 tests, 2 assertions)
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/vm.php test/repro/maintainer_enum_type_constant.php'
x / x / defined
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php test/repro/maintainer_enum_type_constant.php'
x / x / defined
```
AOT backed-enum compile still segfaults (pre-existing; `enum_backed.phpt` exit 139) — separate from this language parity ticket.