This is an add-on for the Advanced Custom Fields WordPress plugin and will not provide any functionality to WordPress unless advanced Custom Fields is installed and activated.
The NextGEN Gallery field provides a dropdown (select or multi-select) of NextGEN Gallery names (galleries and albums) and the ability to map the selected NextGEN Gallery to the post.
The get_value() API returns an array of the selected NextGEN Gallery IDs and the form album or gallery.
Support ACF5 Pro, ACF4, ACF3, NextCellent Gallery – NextGEN Legacy.
!!! Version 1.1 !!!
This version changes get_value() API returned value. You must change your template files. !!!
The get_value() API returns a following array:
 => Array (
[ngg_id] => 8 ( NextGEN Gallery ‘gallery’ or ‘album’ ID )
[ngg_form] => gallery ( ‘gallery’ or ‘album’ )
These examples should show a NextGEN Gallery gallery or NextGEN Gallery album.
For version 1.1 and later
For version 1.0.2 and earlier