Fatal error: Uncaught Error: Undefined constant "STDIN" in C:\Apache24_x64\htdocs\ipad\vendor\symfony\process\Tests\PipeStdinInStdoutStdErrStreamSelect.php:17 Stack trace: #0 {main} thrown in C:\Apache24_x64\htdocs\ipad\vendor\symfony\process\Tests\PipeStdinInStdoutStdErrStreamSelect.php on line 17