<?php
include_once '../../../../wp-load.php';
if ( ! defined( 'ABSPATH' ) ) exit;

global $wpdb;
$users_table = $wpdb->prefix."mvplayer_users";
$result     = $wpdb->get_results("SELECT * FROM $users_table");
$content="";
$content.= "UserName,UserEmail,User IP Address,Created On \n";
$filename="userdata.csv";

foreach( $result as $data ){
    $content.=$data->UserName.",".$data->UserMail.",".$data->UserIPAddress.",".$data->Date;
    $content.="\n";
}

header("Content-type: text/csv");
header("Cache-Control: no-store, no-cache"); 
header("Content-Disposition: attachment; filename=".$filename);
header("Expires: 0");
header("Pragma: no-cache");
echo $content;
exit();