While using reserved PHP keywords as parameter name labels is allowed, in the context of function calls using named parameters in PHP 8.0+, this will easily lead to confusion. To avoid that, it is recommended not to use reserved keywords as function parameter names.
This commit renames the `$object` variable in `Custom_Image_Header` class methods to `$attachment` for clarity and consistency, as the variable type is actually an array, and updates the documentation accordingly.
Props jrf, aristath, poena, justinahinon, SergeyBiryukov.
See #55327.
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