在codeigniter中检索图像

$this->load->library('image_lib');

$image_path = '/path/to/image.jpg';
$image_data = file_get_contents($image_path);

$image_url = 'https://example.com/image.jpg';
$image_data = file_get_contents($image_url);

$image_id = 1;
$image_data = $this->db->get_where('images', ['id' => $image_id])->row()->image_data;

$config['image_library'] = 'gd2';
$config['source_image'] = '/path/to/image.jpg';
$config['create_thumb'] = TRUE;
$config['maintain_ratio'] = TRUE;
$config['width'] = 200;
$config['height'] = 200;

$this->load->library('image_lib', $config);
$this->image_lib->resize();

$config['image_library'] = 'gd2';
$config['source_image'] = '/path/to/image.jpg';
$config['x_axis'] = 100;
$config['y_axis'] = 100;
$config['width'] = 200;
$config['height'] = 200;

$this->load->library('image_lib', $config);
$this->image_lib->crop();

$config['image_library'] = 'gd2';
$config['source_image'] = '/path/to/image.jpg';
$config['rotation_angle'] = 'hor';

$this->load->library('image_lib', $config);
$this->image_lib->rotate();