Fatal error: Uncaught Error: Undefined constant "STDIN" in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/symfony/process/Tests/PipeStdinInStdoutStdErrStreamSelect.php:17 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/symfony/process/Tests/PipeStdinInStdoutStdErrStreamSelect.php on line 17