add declaration of dynamically declared variables, which is deprecated #4
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| private mixed $scorePlayerA = NULL; | ||
| private mixed $scorePlayerB = NULL; |
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mixed is rarely a good idea unless you are creating a really abstract code for a framework or an open source module. it is way too permissive. keeping things closer to what you expect will avoid weird types to be set by mistake.
Suggested change
| private mixed $scorePlayerA = NULL; | |
| private mixed $scorePlayerB = NULL; | |
| private ?int $scorePlayerA = null; | |
| private ?int $scorePlayerB = null; |
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