Api !== Http

example.php

<?
class Api {
  const SUCCESS = 0;
  const FAILURE = 13;
  
  public function doThingOne($SomeArgument) 
  {
    // do something
    return self::SUCCESS;
  }
  
  public function doThingTwo($SomeArgument) 
  {
    // do something else
    if (bad_thing_happened()) {
      return self::FAILURE;
    }
    return self::SUCCESS;
  }
}

class HttpApi 
{
  private $api;
  
  public function __construction(Api $api) 
  {
    $this->api = $api;  
  }
  
  public function post($route, $request) 
  {
    //.. do stuff with request & route
    $result = $this->api->doThingOne($data);
    if ($result == Api::Success) {
      return new Response(HTTPCODE::OK);
    } else {
      return new Response(HTTPCODE::SERVER_ERROR);
    }
  }
}

class CommandLineApi 
{
  private $api;
  
  public function __construction(Api $api) 
  {
    $this->api = $api;  
  }
  
  public function execute($command_line_args, $output) 
  {
    //.. do stuff with $command_line_args
    $result = $this->api->doThingOne($data);
    if ($result != Api::Success) {
      $output->write("something went wrong!!!");
    }
    return (int) $result;
  }
}