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<?php if (!defined('ABSPATH')) { exit; } if (!class_exists('ACF_Ajax_Upgrade')) { class ACF_Ajax_Upgrade extends ACF_Ajax { var $action = 'acf/ajax/upgrade'; function get_response($request) { if (isset($request['blog_id'])) { switch_to_blog($request['blog_id']); } if (!acf_has_upgrade()) { return new WP_Error('upgrade_error', __('No updates available.', 'acf')); } ob_start(); acf_upgrade_all(); $error = ob_get_clean(); if ($error) { return new WP_Error('upgrade_error', $error); } return true; } } acf_new_instance('ACF_Ajax_Upgrade'); }