The Class cannot be used as attribute inspection verifies that a class is annotated with # in its arguments declaration. Several code inspections help to ensure that attributes are used correctly: To use code completion, press Ctrl+Space. Inside the attribute, optionally provide the target and repeatability flags. To create an attribute, add the # marker on top of a class declaration. Unlike PHPDoc comments, attributes are supported and validated on the language level. With attributes, you can provide structured, syntactic metadata to declarations of classes, properties, functions, and so on. If there are arguments in the list whose passed value matches the default value, PhpStorm highlights them as unused and provides a quick-fix to delete them. In a function call, you can use the provided quick-fix Alt+Enter to add parameter names either one by one or to all arguments at once. This way, function calls become self-documenting and arguments order becomes arbitrary. Named arguments allow passing arguments to a function based on the parameter name rather than position. For more information about migrating your code, refer to the Migrating from PHP 7.4.x to PHP 8.0.x guide. For more information about new functionality in this version, refer to the release announcement. PHP 8.0 brings new features, syntax additions, and bugfixes.
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