Are traits a violation of SOLID principles?

Traits in PHP are a mechanism for code reuse that allows methods to be included in multiple classes without inheritance. They do not violate SOLID principles by themselves, but can lead to problems if used improperly.

For example, the Single Responsibility Principle may be violated if traits contain too much heterogeneous logic. Also, excessive use of traits can complicate understanding and maintaining the code, which contradicts the Open/Closed Principle.

Thus, traits are a tool that, when used wisely, helps adhere to SOLID, but when abused, can lead to violations.