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Rule set ``@PHP80Migration``
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Rules to improve code for PHP 8.0 compatibility.

Rules
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- `@PHP73Migration <./PHP73Migration.rst>`_
- `clean_namespace <./../rules/namespace_notation/clean_namespace.rst>`_
- `no_unset_cast <./../rules/cast_notation/no_unset_cast.rst>`_
- `normalize_index_brace <./../rules/array_notation/normalize_index_brace.rst>`_