lazy loading programming data mapper.

spikeDM.php

<?php


/**
* 
*/
class ClassName  {
  
  public function setAuthor($fun)
  {
      $this->author = $fun;
  }
  
  public function getAuthor()
  {   

    //is a function
    return $this->author();
    
    //the only solution ? 
    //return call_user_func( $this->author );
  }
}

class Fake
{
    protected $value;
    
    public function __invoke()
    {
        if ($this->value)
        {
            return $value;
        }
        else
        {
            $this->value = 2;
            return 2; // $this->mapper->find(...)
        }
    }
}

$d = new Fake;
$c = new ClassName();
$c->setAuthor($d);
echo $c->getAuthor();

?>