Was missing in PHP 8.4, but turned out to be easy.

<?php
class Example
{
    public private(
set) static string $classTitle 'Example class';

    
// Implicitly public-read, just like object properties.
    
protected(set) static int $counter 0;

    public static function 
changeName(string $name): void
    
{
        
// From private scope, so this is allowed.
        
self::$classTitle $name;
    }
}

print 
Example::$classTitle// Allowed.

Example::$classTitle 'Nope'// Disallowed.
?>