Prerequisite: The scanning process will consume memory resources. I suggest increasing the memory limit in your PHP.ini to 512M, or more if needed. Before test Check out and install a version of Moodle before the patch has been applied: git checkout 12a81769265a4fa75232ff1639423be1565c9fa9 Install PHPStan composer require --dev phpstan/phpstan Create phpstan.neon file in the moodle instance's root folder with the following contents: parameters: level: 6 checkDynamicProperties: true Generate a baseline file. vendor/bin/phpstan analyse --generate-baseline phpstan-baseline.php --memory-limit 512M mod/assign Update phpstan.neon with the following contents: includes: - phpstan-baseline.php parameters: level: 6 checkDynamicProperties: true After patch Check out the version with the patch applied git checkout master Rerun the analysis: vendor/bin/phpstan analyse --memory-limit 512M mod/assign > result.txt Open the result.txt file. Search for "Access to an undefined property". Verify that all results are something like: "was not matched in reported errors". After the test Remember to delete/revert all the changes git reset --hard