Unique Website Visitor Logger

js-hit.php

<?php
const TESTING = false;
const FILE_NAME = ".hits";
const DAYS = 10;
const PASSWORD = "YOUR PASSWORD HERE";

$user_agent = strip_tags($_SERVER['HTTP_USER_AGENT']);
$bots = ["bot", "slurp", "spider", "crawler"];
foreach ($bots as $bot) {
  if (stripos($user_agent, $bot) !== false) exit();
}

$today = date('j');
$log = "";

// Get the data
$data = [
  'today' => $today,
  'records' => []
];

if (is_file(FILE_NAME))
  $data = (array) json_decode(file_get_contents(FILE_NAME));
else
  for($n = 0; $n < DAYS; $n++)
    $data['records'][] = [];

if (isset($_POST["x"]) && $_POST["x"] == PASSWORD)
  exit(json_encode($data));

// Check for new day
if ($data['today'] != $today) {
  $data['today'] = $today;
  for($n = DAYS - 1; $n > 0 ; $n--)
    $data['records'][$n] = $data['records'][$n - 1];
  $data['records'][0] = [];
}

// Log hit
$ip = preg_replace('/[^.:0-9a-z]/', '', $_SERVER['REMOTE_ADDR']);
if (in_array($ip, $data['records'][0]))
  $log = "Existing $ip";
else {
  $data['records'][0][] = $ip;
  $log = "Added $ip";
  file_put_contents(FILE_NAME, json_encode($data));
}

if (TESTING) {
  echo $log;
  print_r($data);
}

The script creates an array of unique IPv4 addresses for each day. So the visitor count may be deduced from the array sizes. Also, there is a primitive web bot filter applied to try to eliminate web bots that may use JavaScript from the results.

My idea is to create an automated reporting tool that gathers this data from my sites and creates a daily report for me that is saved to my PC.