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Psalm

Last modified: 22 January 2025

PhpStorm provides code quality check through integration with the Psalm tool, which validates your code for consistency against a set of validation rules.

To use Psalm from PhpStorm instead of command line, you need to register it in PhpStorm and configure it as a PhpStorm code inspection. Once installed and enabled in PhpStorm, the tool is available in any opened PHP file, and no additional steps are required to launch it. The on-the-fly code check is activated upon every update in the file thus making it easy to get rid of discovered problems.

Errors and warnings reported by Psalm on the fly are highlighted in the editor in the same way as errors and warnings from PhpStorm's internal code inspections. When the tool is run in batch mode, the errors and warnings are displayed in the Problems tool window. Each message has the psalm prefix to distinguish it from PhpStorm internal inspections.

Psalm integration is implemented via the open-source Psalm plugin. This plugin is bundled with PhpStorm and is enabled by default.