[php-src] Issue #11821: Error when killing script: Object of class UnwindExit could not be converted to string

Issue: https://github.com/php/php-src/issues/11821 Author: rbro ### Description I am running PHP 8.2.8 and PHP 8.3.0 Beta 1, and at times, I get this error when killing a cli script: ``Object of class UnwindExit could not be converted to string`` It's been tricky to reproduce, but I can intermittently get the error by: 1) Unzip attached [code.zip](https://github.com/php/php-src/files/12207150/code.zip). 2) Run: php -n test.php 3) Immediately press Ctrl-C. If no errors appear, repeat running the script and pressing Ctrl-C. The error I get is: ``` Warning: Uncaught Error: Object of class UnwindExit could not be converted to string in /tmp/test/a.php:2 Stack trace: #0 /tmp/test/test.php(4): require() #1 /tmp/test/test.php(14): {closure}('a') #2 {main} thrown in /tmp/test/a.php on line 2 Fatal error: During class fetch: Uncaught in /tmp/test/a.php on line 2 ``` I believe the error comes up when the script is killed while one of the classes is being loaded. Please let me know if I can provide more information to narrow it down. Thanks for your help. ### PHP Version PHP 8.2.8 and PHP 8.3.0 Beta 1 ### Operating System Linux