PHP 8.2: Dynamic Properties are deprecated for the third-party lib

Prerequisite:

The scanning process will consume memory resources. I suggest increasing the memory limit in your PHP.ini to 1G, or more if needed.

Run analysis

1. Install PHPStan

   composer require --dev phpstan/phpstan

2. Download: phpstan_mdl77133.neon and put it into Moodle's root folder.
3. Run the analysis:

   php -dmemory_limit=1G vendor/bin/phpstan analyse --configuration phpstan_mdl77133.neon -vvv | tee result.txt

4. Search for "Access to an undefined property".

   grep -i "Access to an undefined property" result.txt

5. Verify that you only got the below result:

   Access to an undefined property object::$_elements.

   Access to an undefined property object::$_elements.

   Access to an undefined property object::$_duplicateIndex.

   Those errors come from PHPStan's failure to analyze the code because $_elements and $_duplicateIndex properties are already defined here and here.