Bug #80821 [Opn->Csd]: ReflectionProperty::getDefaultValue() returns current value for statics

Edit report at https://bugs.php.net/bug.php?id=80821&edit=1 ID: 80821 Updated by: nikic@php.net Reported by: dktapps at pmmp dot io Summary: ReflectionProperty::getDefaultValue() returns current value for statics -Status: Open +Status: Closed Type: Bug Package: Reflection related Operating System: Linux PHP Version: 8.0.2 -Assigned To: +Assigned To: nikic Block user comment: N Private report: N New Comment: Fixed by https://github.com/php/php-src/commit/3eb97a456648c739533d92c81102cb919eab01c9. Previous Comments: ------------------------------------------------------------------------ [2021-03-02 23:17:25] dktapps at pmmp dot io Description: ------------ When OPcache is not present, default_static_members_table gets written to directly instead of being copied. I'm not sure why this is; at best it seems like a premature optimisation, especially considering that OPcache should be used in the 99% case. This problem has plagued ext-pthreads and other threading extensions for many years (since even before PHP 7.0), creating inconsistencies of behaviour when OPcache is used, vs when it is not. This can finally be seen in userland in PHP 8.0 with the script below, which demonstrates the problem using reflection. Side note: A similar problem/inconsistency also exists with function static_variables, but these can't be inspected using reflection, since PHP doesn't offer any reflection API to see the default values of static variables. (This is primarily a problem for ext-pthreads class copying.) Test script: --------------- <?php class Statics{ public static $staticVar = 1; } Statics::$staticVar = 2; $reflect = new \ReflectionClass(Statics::class); $prop = $reflect->getProperty("staticVar"); var_dump($prop->getDefaultValue()); Expected result: ---------------- int(1) Actual result: -------------- WITH OPcache: int(1) WITHOUT OPcache: int(2) ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80821&edit=1