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Rule set ``@PHP7x4Migration``
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Rules to improve code for PHP 7.4 compatibility.

Rules
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- `@PHP7x3Migration <./PHP7x3Migration.rst>`_
- `assign_null_coalescing_to_coalesce_equal <./../rules/operator/assign_null_coalescing_to_coalesce_equal.rst>`_
- `normalize_index_brace <./../rules/array_notation/normalize_index_brace.rst>`_
- `short_scalar_cast <./../rules/cast_notation/short_scalar_cast.rst>`_