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Undefined constant

Reports the references to constants that are not found in the project files, configured include paths, or among the PHP predefined constants.

Locating this inspection


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

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 constant inspection, and the reference of their default values.

PHP 8.0 Severity

Default setting: Error

Other available settings:

  • Warning

  • Weak Warning

  • Server Problem

  • Grammar Error

  • Typo

  • Consideration

  • Information


By default bundled with

PhpStorm 2024.1, Qodana for PHP 2024.1,

Can be installed with plugin


Last modified: 18 June 2024