Error Identifier: classConstant.nameType

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);

class Foo
{
    public const BAR = 1;
}

function doFoo(int $name): void
{
    echo Foo::{$name};
}

Why is it reported? #

PHP 8.3 introduced dynamic class constant fetching using the syntax ClassName::{$expr}. The expression used as the constant name must evaluate to a string. Passing a non-string value such as an int is not valid because class constant names are always strings.

How to fix it #

Ensure the expression used for the dynamic constant name is a string:

 <?php declare(strict_types = 1);
 
-function doFoo(int $name): void
+function doFoo(string $name): void
 {
     echo Foo::{$name};
 }

Or cast the value to a string:

 <?php declare(strict_types = 1);
 
 function doFoo(int $name): void
 {
-    echo Foo::{$name};
+    echo Foo::{(string) $name};
 }

How to ignore this error #

You can use the identifier classConstant.nameType to ignore this error using a comment:

// @phpstan-ignore classConstant.nameType
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: classConstant.nameType

Rules that report this error #

PHPStan\Rules\Constants\DynamicClassConstantFetchRule [1]

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