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<?php
namespace FilmTools\FilmSpeed;
abstract class FilmSpeedAbstract implements FilmSpeedInterface
{
/**
* @var float
*/
protected $din;
protected $asa;
* @inheritDoc
public function getDin() : float
return $this->din;
}
public function getAsa() : float
return $this->asa;
public function getIso( ) : string
$din = $this->getDin( );
$asa = $this->getAsa( );
return sprintf("ISO %s/%s°", $asa, $din);