code: public function __isset($strKey)
  	{
  		if ($this->intIndex < 0)
  		{
  			$this->first();
  		}
  
  		return isset($this->arrModels[$this->intIndex]->$strKey);
  	}
docs: Check whether a property is set
  
  @param string $strKey The property name
  
  @return boolean True if the property is set