Warning: Undefined variable $undefined in C:\laragon\www\dinesync\vendor\react\event-loop\tests\bin\12-undefined.php on line 12

Fatal error: Uncaught Error: Call to a member function foo() on null in C:\laragon\www\dinesync\vendor\react\event-loop\tests\bin\12-undefined.php:12 Stack trace: #0 {main} thrown in C:\laragon\www\dinesync\vendor\react\event-loop\tests\bin\12-undefined.php on line 12