Fatal error: Uncaught Error: Undefined constant "STDIN" in D:\Application\www\Training\vendor\symfony\process\Tests\PipeStdinInStdoutStdErrStreamSelect.php:17 Stack trace: #0 {main} thrown in D:\Application\www\Training\vendor\symfony\process\Tests\PipeStdinInStdoutStdErrStreamSelect.php on line 17