Stdlib: ResponseCode enum — PHP 8.4 http_response_code() backed enum missing (ext/standard/head.c, pairs #6037)

[PurHur]

Summary

PHP 8.4 adds ResponseCode int-backed enum as the typed parameter/return for http_response_code(). This compiler implements int-based http_response_code() (ext/standard/http_response_code.php, lib/Web/ResponseContext.php) but does not register the enum; callers cannot pass ResponseCode::NotFound and reads do not return enum cases.

Issue #6037 covers php-src-strict TypeError when passing arbitrary enum cases to int-only paths; this issue implements the real ResponseCode enum surface.

php-src reference

• php/php-src ext/standard/head.c — zif_http_response_code
• php/php-src ext/standard/basic_functions.stub.php — enum ResponseCode: int { … }

Repro

./script/docker-exec.sh -- php bin/vm.php test/repro-maintainer/response_code_enum.php

Current: bool(false) for class_exists('ResponseCode'); int path works (http_response_code(404) → int(404))

Expected (Zend PHP 8.4+): enum_exists('ResponseCode'); http_response_code(ResponseCode::NotFound) sets status; getter returns ResponseCode case (or false when unset per Zend).

Implementation (PHP-in-PHP)

1. Register ResponseCode in ext/standard/BuiltinEnums.php.
2. Extend ext/standard/http_response_code.php VM handler + JitHttpResponseCode.php to accept enum case operands and return enum on read (coerce backing int for CGI emit).
3. Update lib/JIT/Builtin/HttpResponseCode.php lowering for enum operands.
4. Compliance .phpt under test/compliance/cases/stdlib/http_response_code_enum.phpt (VM + JIT/AOT).

Done when

• Repro: enum_exists('ResponseCode') true
• Round-trip set/get with enum cases matches Zend
• Pairs Stdlib: http_response_code() — enum case response_code must TypeError (ext/standard/head.c, php-src-strict) #6037 strict rejection for wrong enum types

Links

#6037 · #7294 · #1492

[PurHur]

Maintainer repro script (local path test/repro-maintainer/): see issue body command; paste into a .php file if the path is not yet on master.