How to track no of visitor in a website?

In HTML
This website has been visited <?php visitor_counter();?> times.


function visitor_counter(){
global $wpdb;
$table=$wpdb->prefix.'vcounter';
$charset_collate = $wpdb->get_charset_collate();

$sql = "CREATE TABLE $table (
  ipaddress varchar(100) UNIQUE NOT NULL
) $charset_collate;";

require_once( ABSPATH . 'wp-admin/includes/upgrade.php' );
dbDelta($sql);
$ipaddress=$_SERVER['REMOTE_ADDR'];
$value=array('ipaddress' => $ipaddress );
$wpdb->insert($table, $value);
$count="select count(ipaddress) from ".$table;
$c= $wpdb->get_var($count);
echo number_format($c+850780);
}