<?php
namespace Bank\...\Controller;

class MoneyController{
  public function transfer($from,$to,$amount){
    $source = $this->loadAccount($from);
    $target = $this->loadAccount($to);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->deposit($target,$amount);

    return render(...);
  }

  private function loadAccount($id){
    $acc = $this->...->load($id);
    if($acc instanceof Account){
      return $acc;
    }
    throw AccountException::notFound($id);
  }
  
  ...
}

<?php
namespace Bank\...\Controller;

class MoneyController{

  ...

  private function guardEnoughMoneyOnSourceAccount($acc,$amount){
    if($acc->currentBalance() < $amount){
      throw AccountException::notEnoughFunds();
    }
  }
  private function withdraw($acc,$amount){
    $acc->withdraw($amount);
    $this->...->save($acc);
  }
  private function deposit($acc,$amount){
    $acc->deposit($amount);
    $this->...->save($acc);
  }
}

<?php
namespace Bank\...\Controller;

class MoneyController{
  public function transfer($from,$to,$amount){
    $source = $this->loadAccount($from);
    $target = $this->loadAccount($to);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->deposit($target,$amount);

    $this->sendEmailAboutDeposit($target,$amount);

    return render(...);
  }

  
  ...
}

<?php
namespace Bank\...\Controller;

class MoneyController{
  public function transfer($from,$to,$amount){
    $source = $this->loadAccount($from);
    $target = $this->loadAccount($to);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->deposit($target,$amount);

    $this->sendEmailAboutDeposit($target,$amount);
    $this->sendSmsAboutDeposit($target,$amount);

    return render(...);
  }

  
  ...
}

<?php
namespace Bank\...\Controller;

class MoneyController{
  public function transfer($from,$to,$amount){
    $source = $this->loadAccount($from);
    $target = $this->loadAccount($to);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->deposit($target,$amount);

    $this->sendEmailAboutDeposit($target,$amount);
    $this->sendSmsAboutDeposit($target,$amount);
    $this->sendEmailAboutWithdrawal($source,$amount);

    return render(...);
  }

  
  ...
}

  public function transfer($from,$to,$amount){
    $source = $this->loadAccount($from);
    $target = $this->loadAccount($to);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->deposit($target,$amount);

    $this->sendEmailAboutDeposit($target,$amount);
    $this->sendSmsAboutDeposit($target,$amount);
    $this->sendEmailAboutWithdrawal($source,$amount);

    return render(...);
  }
  public function outgoingExternalTransfer($from,$to,$amount){
    $source = $this->loadAccount($from);

    $this->guardCurrentUserOwnsAccount($source);
    $this->guardEnoughMoneyOnSourceAccount($source,$amount);

    $this->withdraw($source,$amount);
    $this->contactOtherBankToDeposit(...);

    $this->sendEmailAboutWithdrawal($source,$amount);

    return render(...);
  }

...
  public function incomingExternalTransfer($from,$to,$amount){
    $target = $this->loadAccount($to);

    $this->deposit($target,$amount);

    $this->confirmRequestToOtherBank(...);

    $this->sendEmailAboutDeposit($target,$amount);
    $this->sendSmsAboutDeposit($target,$amount);

    return render(...);
  }
 ...

<?php
namespace Bank\...\Controller;

class MoneyXMLController{
  public function outgoingExternalTransfer($xml){
    ..
  }

  public function incomingExternalTransfer($xml){
    ..
  }  
  ...
}