classConstant.nonFinal

Code example

<?php declare(strict_types = 1);

trait HasVersion
{
    final public const VERSION = '1.0';
}

class App
{
    use HasVersion;

    public const VERSION = '1.0';
}

Why is it reported?

The class declares a constant that overrides a final constant from a used trait, but does not declare it as final as well. When a trait defines a constant as final, any class that uses the trait and redeclares that constant must also declare it as final. This is a PHP language constraint for trait constant inheritance.

How to fix it

Add the final keyword to the overriding constant:

 <?php declare(strict_types = 1);

 class App
 {
     use HasVersion;

-    public const VERSION = '1.0';
+    final public const VERSION = '1.0';
 }

Or remove the redeclaration and let the trait constant be inherited:

 <?php declare(strict_types = 1);

 class App
 {
     use HasVersion;
-
-    public const VERSION = '1.0';
 }