[Nexus]

Это как?

http://sandbox.onlinephpfunctions.co...f43864b2b53300

<?php

abstract class AbstractHttpService {
    protected string $baseRouteName;
    
    public function __construct(?string $baseRouteName = null) {
        if ($baseRouteName) {
            $this->baseRouteName = $baseRouteName;
        }
        
        var_dump($this->baseRouteName);
    }
}

class ProductsHttpService extends AbstractHttpService {
    protected string $baseRouteName = 'product';
}

new ProductsHttpService();// string(7) "product"