Prevent memory error when using PHP8 and a session error happens #16943

Description:

Noticed it exceeded 512MB, then 2GB, ...

It was running in an endless loop because

PHP Fatal error: Uncaught ArgumentCountError: Too few arguments to function Zend_Session_Exception::handleSessionStartError(), 4 passed and exactly 5 expected i

See https://www.php.net/manual/en/function.set-error-handler.php

Since PHP 8: errcontext was removed, and will no longer be passed to user callbacks.

There might be also other places where we maybe use error handler

Review

• [ ] Functional review done
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed