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Type declaration is redundant and could be simplified

Reports union type declarations that contain redundant types, for example, a union type that contains both the class alias and the original class.

See Union Types RFC: Duplicate and redundant types (php.net) for details.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

PhpRedundantTypeInUnionTypeInspection
Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | PHP | Type compatibility

Availability

By default bundled with

PhpStorm 2024.1, Qodana for PHP 2024.1,

Can be installed with plugin

PHP, 241.SNAPSHOT

Last modified: 18 June 2024