public function getKeyValue()
    {
        if (array_key_exists($this->primary_key, $this->original)) {
            return $this->original[$this->primary_key];
        }

        return null;
    }
public function getKeyValue()
    {
        if (array_key_exists($this->primary_key, $this->original)) {
            return $this->original[$this->primary_key];
        }

        return null;
    }
public function getKeyValue ( ) { if ( array_key_exists ( $ this -> primary_key , $ this -> original ) ) { return $ this -> original [ $ this -> primary_key ] ; } return null ; }
Retrieves the primary key value

@return mixed
Retrieves the primary key value