php ci框架 处理图像 修改大小

  $config['image_library'] = 'gd2';
  $config['source_image'] = './upload/img/'.$this->upload->data()['orig_name'];
  $config['create_thumb'] = TRUE;
  $config['maintain_ratio'] = false;
  $config['width'] = 500;
  $config['quality'] = "90%";
  $config['file_permissions'] = 0755;
  $config['height'] = 750;
            
  $this->load->library('image_lib', $config);
            
  $r = $this->image_lib->resize();

具体介绍，请看文档ci文档