Undefined class constant

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.

PhpUndefinedClassConstantInspection

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 | Undefined symbols

Inspection options

Here you can find the description of settings available for the Undefined class constant inspection, and the reference of their default values.

Downgrade severity if __magic methods are present in class

Option ID:

DOWNGRADE_SEVERITY

Default value:

Selected

Notify on accessing member of mixed, object, stdClass, undefined type, null

Option ID:

WARN_ON_MIXED

Default value:

Not selected

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:

• IntelliJ IDEA 2025.3

• PhpStorm 2025.3