I'm still trying to wrap my head around OOP. All of the following examples work, of course, but is there one (or possibly another) that best exemplifies OOP concepts?/** * For the following examples the Image class queries an image * and associated info from a database, which is passed on * instantiation via dependency injection. */$image = new Image(new Db());Example 1:if ($image->setImageId($id, $size)) {    header('content-type: ' . $image->content_type);    header('content-length: ' . $image->length);    echo $image->getBytes();}Example 2:if ($image_info = $image->getImageInfoByIdAndSize($id, $size)) {    header('content-type: ' . $image_info->content_type);    header('content-length: ' . $image_info->length);    echo $image->getImageBytesByIdAndSize($id, $size);}Example 3:$image->setImageIdAndSize($id, $size);if ($image_info = $image->getImageInfo()) {    header('content-type: ' . $image_info->content_type);    header('content-length: ' . $image_info->length);    echo $image->getImageBytes();}
Which of these OOP examples demonstrate proper OOP concepts?
php;object oriented;design