Regression: class_alias(internal) succeeds on PROFILE≤8.2 — Zend ValueError (re-#29084, Zend/zend_builtin_functions.c)

[PurHur]

Category

Language · php-src-strict · profile gate · pillar 4

Problem

#29084 / #29106 made class_alias() of internal classes succeed to match Zend 8.3+. On Zend 8.1/8.2, the same call still throws ValueError: class_alias(): Argument #1 ($class) must be a user-defined class name, internal class name given.

With PHP_COMPILER_PROFILE=8.2 (and 8.1), VM/JIT still return true for stdClass / Exception / Traversable aliases — no profile gate.

Verified 2026-08-08 on master @ 98b7c4dc4b vs php:8.2-cli (8.2.32) and php:8.4-cli (8.4.24).

Repro	Zend 8.2.32	Zend 8.4.24	VM/JIT PROFILE=8.2	VM PROFILE=8.4
class_alias(stdClass::class, 'A')	ValueError	true	true ❌	true OK
class_alias(Exception::class, 'E')	ValueError	true	true ❌	true OK
class_alias(User::class, 'U') (user)	true	true	true OK	true OK

php-src reference

• php/php-src Zend/zend_builtin_functions.c (PHP-8.2) — zend_argument_value_error(1, \"must be a user-defined class name, internal class name given\") for internal ce
• Behavior change: restriction lifted in 8.3+ (no ValueError for fresh alias of internal class)

PHP implementation target

• lib/ / VM + JIT class_alias path — when PHP_COMPILER_PROFILE ≤ 8.2, reject internal class/interface operands with Zend's ValueError message; keep Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 allow path for PROFILE ≥ 8.3
• User-defined classes remain aliasable on all profiles
• Duplicate-name Warning+false path unchanged
• No new C runtime

Repro

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
cat > /tmp/class_alias_internal_82.php << \"PHP\"
<?php
error_reporting(E_ALL);
try {
  var_export(class_alias(stdClass::class, \"AliasStd_\" . bin2hex(random_bytes(3))));
} catch (Throwable $e) {
  echo get_class($e), \":\", $e->getMessage();
}
echo \"\n\";
PHP
PHP_COMPILER_PROFILE=8.2 php bin/vm.php /tmp/class_alias_internal_82.php
PHP_COMPILER_PROFILE=8.2 php bin/jit.php /tmp/class_alias_internal_82.php
# expect ValueError matching php:8.2-cli
'

Done when

• PROFILE=8.1/8.2: VM+JIT throw Zend ValueError for internal class/interface operands (stdClass, Exception, Traversable, …)
• PROFILE≥8.3: still true for fresh internal aliases (no Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 regression)
• User-defined class_alias still succeeds on all profiles
• Compliance .phpt under test/compliance/cases/ with PROFILE SKIPIF
• php-src-strict; no php-compiler-strict shortcut

[PurHur]

claim: worker-lane-C — starting this run

Gate snapshot (before implement):

• docker info: ok
• php script/bootstrap-inventory.php --check: red — stale docs/bootstrap-inventory.md (DOM helper method-count drift; not this issue)
• Claiming Regression: class_alias(internal) succeeds on PROFILE≤8.2 — Zend ValueError (re-#29084, Zend/zend_builtin_functions.c) #29150 (class_alias internal PROFILE≤8.2 ValueError)

[PurHur]

Merged #29155

Verification

• PHP_COMPILER_PROFILE=8.2 VM+JIT issue repro → Zend ValueError for stdClass / Exception / Traversable
• PROFILE=8.4 / default keep Regression: class_alias() rejects internal classes with ValueError — Zend allows stdClass/Exception aliases (re-#18290, Zend/zend_builtin_functions.c) #29084 allow + duplicate warn+false
• phpunit filter ClassAliasInternalProfile29150Test|ClassAliasInternal29084Test|testAllowsClassAliasOfInternalClass → 8 OK

Not covered: full ci-fast / compliance suite; inventory --check still red on master for unrelated DOM doc drift.