use named exception handler

Author: staabm

tests/end-to-end/regression/5592-process-isolation-events.phpt

@@ -8,7 +8,11 @@ $_SERVER['argv'][] = '--process-isolation';
 $_SERVER['argv'][] = '--debug';
 $_SERVER['argv'][] = __DIR__ . '/5592/Issue5592TestIsolation.php';
 
-set_exception_handler(static fn () => null);
+function global5592IsolationEventsExceptionHandler(Throwable $exception): void
+{
+}
+
+set_exception_handler('global5592IsolationEventsExceptionHandler');
 
 require_once __DIR__ . '/../../bootstrap.php';
 (new PHPUnit\TextUI\Application)->run($_SERVER['argv']);