classConstant.dynamicFetch

Code example

<?php declare(strict_types = 1);

class Foo
{
	public const BAR = 'bar';
}

$name = 'BAR';
echo Foo::{$name};

Why is it reported?

Fetching class constants with a dynamic name (using a variable expression) is a feature only available in PHP 8.3 and later. If the project targets an earlier PHP version, this syntax is not supported and will cause a syntax error.

How to fix it

If upgrading to PHP 8.3 or later is an option, update the PHP version in the PHPStan configuration.

Otherwise, use the constant() function to access the class constant dynamically:

 <?php declare(strict_types = 1);

 $name = 'BAR';
-echo Foo::{$name};
+echo constant(Foo::class . '::' . $name);