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, $meta_value) {
// _wp_attachment_metadata added
if($meta_key === '_wp_attachment_metadata') {
// Add Custom Field
update_post_meta($post_id, '_example_meta_key', 'ex087659bh');
// _wp_attached_file
// _wp_attachment_metadata (serialized)
// _wp_attachment_image_alt
// _example_meta_key
$attachment_meta = get_post_meta($post_id);
}
}
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