如何在codeigniter中将上传图像比率限制为16：9？ [英] How to restrict the upload image ratio to 16:9 in codeigniter?

问题描述

  $ this->加载 - >库（'上传'）; 
 $ ext = pathinfo（$ file_name，PATHINFO_EXTENSION）; 
 
 $ img_name = now（）。  。 $ EXT; 
 
 $ imgConfig ['upload_path'] = $ this-> image_path; 
 $ imgConfig ['file_name'] = $ img_name; 
 $ imgConfig ['max_size'] ='2048'; 
 $ imgConfig ['allowed_types'] ='jpg | png | bmp'; 
 $ imgConfig ['overwrite'] = FALSE; 
 $ this-> upload-> initialize（$ imgConfig）; 
 
 if（$ this-> upload-> do_upload（image_url））{
 $ this-> Playlist_model-> update_playlist（$ insert_id，array（image_url => $ img_name））; 
} 
  

而前端只是一个

 < input type ='file'> 
  

问题是，因为图像上传应该是一个视频缩略图，我应该怎么做才能实现上传？例如在前端使用插件来限制/裁剪（任何推荐）

另外，在服务器端，我该如何检查？

解决方案

  maintain_ratio 
  

它保持你喜欢的偏好比例

 指定在调整大小或使用硬值时是否保持原始高宽比。 
  

更多详情
https://ellislab.com/codeigniter/user-guide/libraries/image_lib.html
根据宽度调整图像大小&裁剪额外高度，Codeigniter
在Codeigniter中调整大小和裁剪

Here is the code I used for uploading an image.

$this->load->library('upload');
$ext = pathinfo($file_name, PATHINFO_EXTENSION);

$img_name = now() . "." . $ext;

$imgConfig['upload_path'] = $this->image_path;
$imgConfig['file_name'] = $img_name;
$imgConfig['max_size'] = '2048';
$imgConfig['allowed_types'] = 'jpg|png|bmp';
$imgConfig['overwrite'] = FALSE;
$this->upload->initialize($imgConfig);

if ($this->upload->do_upload("image_url")) {
    $this->Playlist_model->update_playlist($insert_id, array("image_url" => $img_name));
}

And the frontend is simply a

<input type = 'file' >

The problem is , as the image upload should be an video thumbnail, what should I do to implement the upload? e.g using plugin in frontend to restrict/ crop (any recommendation)

Also, in server side how can I check?

解决方案

maintain_ratio

it the Preference you to maintain ratio

Specifies whether to maintain the original aspect ratio when resizing or use hard values.

For more details https://ellislab.com/codeigniter/user-guide/libraries/image_lib.html Resize image according to width only & crop Extra Height , Codeigniter Resizing and cropping in Codeigniter

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