Specification Pattern

Entity.php

<?php 
namespace App\Entity;
abstract class Entity 
{
  public function getId() {
    return $this->id;
  }
}  

EntitySpecification.php

<?php
namespace App\Specification;
use App\Entity\Entity as AbstractEntity;

interface EntitySpecification extends Specification {
  
  public function isSatisfiedBy(AbstractEntity $entity);
}

Specification.php

<?php
namespace App\Specification;

interface Specification {
  
  public function isSatisfiedBy($criteria);
}

User.php

<?php
namespace App\Entity;
class User extends Entity {
  
}

UserIsAllowedToDoSomething.php

<?php
use App\Entity\User;
class UserIsAllowedToDoSomething implements EntitySpecification {
  
  public function isSatisfiedBy(User $user) {
    return $user->isAdmin();
  }
}