Example of usinf use statement with PHP namespaces

use-style

<?php

// class User.php

namespace Billing;

class User {
 ...
}


// class Aggregator.php

namespace Billing\Aggregator;

class Aggregator {
 ...
}

// class Processor.php

namespace Billing\Aggregator;

class Processor {
 ...
}

// class Manager.php

namespace Billing\Aggregator\Details;

use Billing\User as User;

class Manager {
  function ...(User $User) { // User -> \Billing\User
    $Details = new Details($User);
  }
}


// class Details.php

namespace Billing\Aggregator\Details;

// allow use only for root namespace Billing
use Billing\User as User;
use Billing\Aggregator\Aggregator as Aggregator;
use Billing\Aggregator\Processor as AggregatorProcessor;

class Details {
  function ...(User $User, Aggregator $Aggregator) { // User -> \Billing\User, Aggregator -> \Billing\Aggregator\Aggregator
    ...
    $Processor = new AggregatorProcessor(); // relative name mean class is from Billing
    $FeatureUser = \Feature\User(); // absolute name every time when need class from another root namespace
  }
}