<?php
new my_pluging_name_acf_group_save();
class my_pluging_name_acf_group_save {
// list of field group IDs used in my plugin
private $groups = array(
'group_5cd98d69d9edd',
'group_5cdd8ef037a51',
'group_5cdda2c94c13a',
'group_5ce3e785e644e',
'group_5d41e7d89ed6c'
);
public function __construct() {
// add fitler before acf saves a group
add_action('acf/update_field_group', array($this, 'update_field_group'), 1, 1);
} // end public function __construct
public function update_field_group($group) {
// called when ACF save the field group to the DB
if (in_array($group['key'], $this->groups)) {
// if it is one of my groups then add a filter on the save location
// high priority to make sure it is not overrridded, I hope
add_filter('acf/settings/save_json', array($this, 'override_location'), 9999);
}
return $group;
} // end public function update_field_group
public function override_location($path) {
// remove this filter so it will not effect other goups
remove_filter('acf/settings/save_json', array($this, 'override_location'), 9999);
// override save path
$path = dirname(plugin_dir_path(__FILE__)).'/acf-json';
return $path;
} // end public function override_json_location
} // end class my_pluging_name_acf_group_save
There is also a plugin https://github.com/khromov/acf-local-json-manager
and I’m sure there are other filters available
