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I'm developing a plugin, and, each time a user uploads an image in the media library, I'd like to modify metadata of this image. I have tried with the hook "wp_handle_upload_prefilter" but it seems this method doesn't work.

  • It is hard to answer such a question. What exactly do you want to modify and ehy the use of that hook wasn't good enough, what code did you use? – Mark Kaplun Dec 27 '15 at 17:23
  • Indeed, it was with "wp_handle_upload". Thanks a lot :) For each image uploaded, I add metadata, with PHP (with iptcembed()) and it works fine ! :) But is it possible to do this, for each thumbnail generated ? – Clément Dec 28 '15 at 13:44
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You need to use attachment_fields_to_save filter. There is nice example on codex. So instead of copying that here, I would rather like to point you towards the codex page. Please take a look here. I hope this helps.

  • I tried with "attachment_fields_to_save", but I think the function is not called, when I'm sending my image to the server :/ – Clément Dec 27 '15 at 19:26
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Use added_post_meta and update_post_meta with the $post_id. For extended properties see this post and this for more image functions.

add_action('added_post_meta', 'wpse_20151218_after_post_meta', 10, 4);

function wpse_20151218_after_post_meta($meta_id, $post_id, $meta_key, $meta_value) {

    if($meta_key === '_wp_attachment_metadata') {

        // Add Custom Field
        update_post_meta($post_id, '_example_meta_key', '1234567');

        $attachment_meta = get_post_meta($post_id);
    }
}

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