Error Identifier: constant.value

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Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

// phpstan.neon:
// parameters:
//   dynamicConstantNames:
//     DATABASE_ENGINE: string|null

const DATABASE_ENGINE = false;

Why is it reported? #

When a global constant is listed in the dynamicConstantNames configuration with an explicit type, PHPStan checks that values assigned via the const statement are compatible with that type. In the example above, DATABASE_ENGINE is configured to accept string|null, but false is being assigned.

This prevents the configured type from becoming inaccurate, which would lead to incorrect analysis results elsewhere in the codebase.

How to fix it #

Change the value to match the configured type:

-const DATABASE_ENGINE = false;
+const DATABASE_ENGINE = null;

Or update the configured type in phpstan.neon to accept the value:

 parameters:
 	dynamicConstantNames:
-		DATABASE_ENGINE: string|null
+		DATABASE_ENGINE: string|false|null

How to ignore this error #

You can use the identifier constant.value to ignore this error using a comment:

// @phpstan-ignore constant.value
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: constant.value

Rules that report this error #

• PHPStan\Rules\Constants\ValueAssignedToGlobalConstantRule [1]