Bug #77652 [NEW]: Anonymous classes can lose their interface information

From: eric at ericstern dot com Operating system: macOS 10.14 PHP version: 7.3.2 Package: Scripting Engine problem Bug Type: Bug Bug description:Anonymous classes can lose their interface information Description: ------------ When a closure returns an anonymous class that implements an interface is returned in a file that is require()d multiple times, subsequent return values have the interface information stripped. I discovered this behavior while writing unit tests around a configuration tool (asserting that the returned value implemented an interface) - the test would pass if it was the _first_ test to run, but fail otherwise. It would also pass if I ran the tests with process isolation enabled. The attached script is the simplest reproduce case I could come up with. Test script: --------------- // run.php <?php interface I {} require 'data.php'; // comment this line out to get the expected behavior $data = require 'data.php'; print_r(class_implements($data['I']())); // data.php <?php return [ 'I' => function() { return new class implements I {}; }, ]; Expected result: ---------------- $ php run.php Array ( [I] => I ) Actual result: -------------- $ php run.php Array ( ) -- Edit bug report at https://bugs.php.net/bug.php?id=77652&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=77652&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=77652&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=77652&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=77652&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=77652&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=77652&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=77652&r=needscript Try newer version: https://bugs.php.net/fix.php?id=77652&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=77652&r=support Expected behavior: https://bugs.php.net/fix.php?id=77652&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=77652&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=77652&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=77652&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=77652&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=77652&r=dst IIS Stability: https://bugs.php.net/fix.php?id=77652&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=77652&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=77652&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=77652&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=77652&r=mysqlcfg