Repository navigation
Language: eval() allows overriding final methods — Zend E_COMPILE_ERROR (Zend/zend_inheritance.c) #24884
Description
Category
language · php-src-strict · inheritance / eval
Problem
Direct compile of a child that overrides a final method correctly fatals. The same declaration via eval() succeeds under the VM and prints ok. Zend fatals for both paths (Cannot override final method A::f()).
| Path | Zend 8.2 (2026-07-29) | VM |
|---|---|---|
class B extends A { function f() {} } (source) |
Fatal: Cannot override final method | parseAndCompile failure (OK) |
eval('class B extends A { function f() {} }') |
Fatal: Cannot override final method (exit 255) | ok (exit 0) |
php-src reference
- php/php-src
Zend/zend_inheritance.c— final method override check - php/php-src
Zend/zend_compile.c— compile-time inheritance for eval
PHP implementation target
- Eval / runtime class declaration path in
lib//lib/VM/— apply the same final-method inheritance guard used for file compile - Related history on final properties/consts: Regression: eval child redeclaration of final class const — silent abort, not Zend fatal (re-#22329, Zend/zend_inheritance.c) #22922, Regression: final class constants can be overridden by child class (re-#4455, Zend/zend_inheritance.c) #22329 (methods via eval still open)
- PHP-in-PHP only; no new C
Repro
./script/docker-exec.sh -- bash -lc 'cat > /tmp/finaleval.php <<'"'"'PHP'"'"'
<?php
class A { final function f() {} }
try {
eval("class B extends A { function f() {} }");
echo "ok\n";
} catch (Throwable $e) {
echo get_class($e), ":", $e->getMessage(), "\n";
}
PHP
echo ZEND:; php /tmp/finaleval.php 2>&1; echo RC:$?
echo VM:; php bin/vm.php /tmp/finaleval.php 2>&1; echo RC:$?'Done when
-
evalof a child overriding a final method fatals like Zend (same message class) - Direct source compile remains fatal
- Repro/compliance guard; php-src-strict
Activity
PurHur commentedon Jul 29, 2026
claim: worker-lane-C — starting this run
Trust snapshot (pre-triage):
Language: eval() cannot override final methods (#24884) (#24900)
PurHur commentedon Jul 29, 2026
Merged via #24900
Verification
php bin/vm.phpissue repro:PHP Fatal error: Cannot override final method A::f()exit 255 (try/catch does not catch — Zend parity)FinalMethodOverrideCheckphpunit --filter 'final_method_eval_override_fatal|FinalMethodOverrideCheckTest'→ OK (7 tests)