<?php

class SignupCommand extends AbstractCommand {

    private $oUser = null;
    private $data = array();

    function __construct($oUser, $data) {
        $this->oUser = $oUser;
        $this->data = $data;
    }

    protected function processCommand() {
        return $this->oUser->Create($this->data);
    }

}

$oUser = new User(); /* Dummy User Object*/

$data = array(
  'name' => "John Doe",
  'username' => "jdoe",
  'email' => "john@doe.com",
);

/* Example */
$oSignupCommand = new SignupCommand($oUser, $data);
$isExecuted = $oSignupCommand->execute()->isExecuted();

if($isExecuted){
  //handle success
}else{
  //handle error
}