<?php
require_once __DIR__.'/../wp-config.php';
session_start();

$unsubemail = isset($_POST['email']) && filter_var($_POST['email'], FILTER_VALIDATE_EMAIL) ? $_POST['email'] : '';
if($unsubemail){
  $now = now();
  $wpdb->insert(TBL_UNSUBEMAIL, array('unsubemail'=>$unsubemail, 'unsub_datetime'=>$now, 'ip'=>$_SERVER['REMOTE_ADDR']));
  $_SESSION['unsubemail_insert_id'] = $wpdb->insert_id;
  die($wpdb->insert_id);
}else{
  die('not valid');
}