'readonly' modifier is redundant
Reports readonly modifiers applied to properties in read-only classes. Those modifiers are redundant since all properties in read-only classes are implicitly read-only.
Read-only classes are supported in PHP 8.2 and later. See Readonly classes RFC (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.
PhpRedundantReadonlyModifierInspection- 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.
Inspection ID: PhpRedundantReadonlyModifierInspection
Suppressing Inspection
You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:
More detailed instructions as well as other ways and options that you have can be found in the product documentation:
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By default bundled with: | IntelliJ IDEA 2025.3, PhpStorm 2025.3, Qodana for JVM 2025.3, Qodana for PHP 2025.3, |