get attachment ID after upload file via acf form

• dennishelbig

• November 4, 2016 at 12:23 pm

Hello, first off: great plugin!

Here is my issue:
I have a front-end form to create a user and pass the form infos to it.
The only struggle I have is with the image-file I want to pass to an image-field.

Usually I would use something like $_FILES['my_image'] in a wp_handle_upload() function to get the attachment ID after it’s uploaded. But $_POST['acf']['field_5819d5e12d2d0'] gives me an error “Warning: Illegal string offset ‘size'” and $_FILES['acf']['field_5819d5e12d2d0'] gives “Notice: Undefined index: field_5819d5e12d2d0”.

Even without any extra function, the file is still uploading to the media library. So is there a way to get the attachment ID of the file after it’s uploaded? Some value that is returned after the upload?

• John Huebner

• November 4, 2016 at 1:15 pm

if field_5819d5e12d2d0 is the field key of the image field then the value of $_POST['acf']['field_5819d5e12d2d0'] is the attachment ID.

• dennishelbig

• November 11, 2016 at 11:19 pm

Hello John, thanks for your hint.

After I read your answer, I realized that I tried to get the attachment ID in a pre_save_post action while the files wasn’t uploaded at this point.