上传后获取上传的附件图像的路径

8

使用媒体上载屏幕在Wordpress中上载附件后，在图像上载后是否可以运行钩子或过滤器，以便获取上载图像的路径以便进行分析？

我正在构建一个插件，该插件将在上载图像后对其进行分析，然后使用在图像中找到的平均颜色标记该图像。唯一的问题是我不知道可以使用哪个钩子，该钩子将在图像上传后立即触发，然后提供一种获取新上传文件路径的方法。

任何帮助将不胜感激。

plugins plugin-development attachments

8

原来，我在同事的帮助下解决了自己的问题。在媒体上载之后或编辑媒体时调用的两个过滤器是：“ add_attachment”和“ edit_attachment”。这是我正在使用的代码，然后检查附件是否为图像（示例中省略了代码）。

function analyse_attachment($attachment_ID)
{          
    $attachment = get_attached_file($attachment_ID); // Gets path to attachment
    update_post_meta($attachment_ID, "image_rgb", $the_colour);
}

add_action("add_attachment", 'analyse_attachment');
add_action("edit_attachment", 'analyse_attachment');

显然，我省略了一些与问题无关的内容。但是，在您上传或编辑附件后，该代码便会立即被调用。

— 德韦恩·查林顿
source

4

您可以使用两个过滤器：attachment_fields_to_save 它获得两个参数（$ post，$ attachment），因此：

add_filter('attachment_fields_to_save',your_image_analyse_function);

function your_image_analyse_function($post, $attachment){
  $attachment['url']
  //do your stuff
}

并media_send_to_editor获得3个参数（$ html，$ send_id，$ attachment）并在单击“发送至编辑器”后触发，因此可以再次使用$ attachment。

add_filter('media_send_to_editor',your_image_analyse_function);

function your_image_analyse_function($html, $send_id, $attachment){
  $attachment['url']
  //do your stuff
}

— Bainternet
source

感谢Bainternet，非常有用。虽然，这些都不是我想要的。在询问我们工作中的高级PHP开发人员之后，他浏览了Wordpress核心文件，并找到了一个在图片或其他内容上传后立即被调用的操作。好吧，其中有两个：'add_attachment'和'edit_attachment'我将其发布为其他人的答案。

— Dwayne Charrington

0

HTML标记：

<p>
  <label for="custom-upload">Upload New Image:</label>
  <input type="file" tabindex="3" name="custom-upload" id="custom-upload" />
</p>
<?php
  /*Retrieving the image*/
  $attachment = get_post_meta($postid, 'custom_image');

  if($attachment[0]!='')
  {
   echo wp_get_attachment_link($attachment[0], 'thumbnail', false, false);
  }

?>

上载图片：

<?php
global $post; /*Global post object*/
$post_id = $post->ID; /*Geting current post id*/
$upload = $_FILES['upload']; /*Receive the uploaded image from form*/
add_custom_image($post_id, $upload); /*Call image uploader function*/

function add_custom_image($post_id, $upload)
{
 $uploads = wp_upload_dir(); /*Get path of upload dir of wordpress*/

 if (is_writable($uploads['path']))  /*Check if upload dir is writable*/
 {
  if ((!empty($upload['tmp_name'])))  /*Check if uploaded image is not empty*/
  {
   if ($upload['tmp_name'])   /*Check if image has been uploaded in temp directory*/
   {
    $file=handle_image_upload($upload); /*Call our custom function to ACTUALLY upload the image*/

    $attachment = array  /*Create attachment for our post*/
    (
      'post_mime_type' => $file['type'],  /*Type of attachment*/
      'post_parent' => $post_id,  /*Post id*/
    );

    $aid = wp_insert_attachment($attachment, $file['file'], $post_id);  /*Insert post attachment and return the attachment id*/
    $a = wp_generate_attachment_metadata($aid, $file['file'] );  /*Generate metadata for new attacment*/
    $prev_img = get_post_meta($post_id, 'custom_image');  /*Get previously uploaded image*/
    if(is_array($prev_img))
    {
     if($prev_img[0] != '')  /*If image exists*/
     {
      wp_delete_attachment($prev_img[0]);  /*Delete previous image*/
     }
    }
    update_post_meta($post_id, 'custom_image', $aid);  /*Save the attachment id in meta data*/

    if ( !is_wp_error($aid) ) 
    {
     wp_update_attachment_metadata($aid, wp_generate_attachment_metadata($aid, $file['file'] ) );  /*If there is no error, update the metadata of the newly uploaded image*/
    }
   }
  }
  else
  {
   echo 'Please upload the image.';
  }
 }
}

function handle_image_upload($upload)
{
 global $post;

        if (file_is_displayable_image( $upload['tmp_name'] )) /*Check if image*/
        {
            /*handle the uploaded file*/
            $overrides = array('test_form' => false);
            $file=wp_handle_upload($upload, $overrides);
        }
 return $file;
}
?>

— 阿文德07
source