Getting Path To Uploaded Attachment Image After Upload

3 comments

1. Turns out I solved my own question with help from a colleague. The two filters that get called after media is uploaded or when media is being edited are; ‘add_attachment’ and ‘edit_attachment’. Here is the code I am using, I then check to see if the attachment is an image (code omitted from example).

   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');
   

   Obviously I’ve omitted some stuff that isn’t relevant to the question. But that code gets called right after you’ve uploaded or edited an attachment.

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2. you have two filters you can use: attachment_fields_to_save
   which gets two paramaters ( $post, $attachment)
   so :

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

   and media_send_to_editor which gets 3 paramaters ( $html, $send_id, $attachment) and fires after you click the send to editor so once again you can use $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
   }
   

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3. HTML Markup:

   <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);
     }
   
   ?>
   

   Uploading the image:

   <?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;
   }
   ?>
   

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