- Move error handling code into a class and remove PhD message output handling from it.
- Introduce a new class to handle PhD message output.
- Make the implicit dependency on the output functionality of classes explicit.
- Update PEAR package.xml.
- Fix tests.
- Use proper variadic parameters
- Use class constants
- Use first-class callable syntax
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Co-authored-by: haszi <haszika80@gmail.com>