如果我只指定高度,我希望$config['maintain_ratio'] = TRUE;
会导致宽度被计算。我猜我必须为高度提供任何大的数字才能使它起作用吗?
$config['image_library'] = 'gd2';
$config['source_image'] = $image_filepath;
$config['new_image'] = $thumbnail_filepath;
$config['maintain_ratio'] = TRUE;
$config['height'] = $this->thumbnail_height;
$this->image_lib->initialize($config);