Heres one I found on the interweb :D
It uses 2 text files which need to be chmoded to 777 to let it work properly. Alternativly you could use AWstats which show unique hits :O:D
<?php
// #################### Define Important Constants ####################
// There should be no need to edit these
define('COUNT_FILE', 'counter.txt');
define('IP_FILE', 'ips.txt');
// ######################## USER CONFIGURATION ########################
// Edit the following.. true = yes, false = no
// Use file locking?
define('USE_FLOCK', true);
// Count only unique visitors?
define('ONLY_UNIQUE', true);
// Show count as images?
define('USE_IMAGES', false);
// Path to the images
define('IMG_DIR', 'counter/images/');
// Image extension
define('IMG_EXT', '.gif');
// ############################ Functions #############################
/**
* We use this function to open, read/write to files.
*
* @param string Filename
* @param string Mode (r, w, a, etc..)
* @param string If writing to the file, the data to write
* @return mixed
*/
function fp($file, $mode, $data = '')
{
if (!file_exists($file) OR !is_writable($file))
{
trigger_error("Error: '<code>$file</code>' does not exist or is not writable.");
}
if (!($fp = @fopen($file, $mode)))
{
trigger_error("Error: '<code>$file</code>' could not be opened.");
}
if (USE_FLOCK AND @flock($fp, LOCK_EX))
{
if ($mode == 'r')
{
return @fread($fp, filesize($file));
}
else
{
@fwrite($fp, $data);
}
@flock($fp, LOCK_UN);
}
else
{
if ($mode == 'r')
{
return @fread($fp, filesize($file));
}
@fwrite($fp, $data);
}
@fclose($fp);
}
/**
* Get the users ip address.
* Pulled from my {@link http://www.domainportfolio.us Domain Portfolio} project.
*
* @param none
* @return string
*/
function get_ip()
{
if ($_SERVER['HTTP_X_FORWARDED_FOR'])
{
if (preg_match_all("#[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}#s", $_SERVER['HTTP_X_FORWARDED_FOR'], $ips))
{
while (list($key, $val) = @each($ips[0]))
{
if (!preg_match("#^(10|172\.16|192\.168)\.#", $val))
{
$ip = $val;
break;
}
}
}
}
else if ($_SERVER['HTTP_CLIENT_IP'])
{
$ip = $_SERVER['HTTP_CLIENT_IP'];
}
else if ($_SERVER['HTTP_FROM'])
{
$ip = $_SERVER['HTTP_FROM'];
}
else
{
$ip = $_SERVER['REMOTE_ADDR'];
}
return preg_replace('#([^0-9,\.]+)#', '', $ip);
}
// ######################## Start Main Script #########################
// Get current count
$count = fp(COUNT_FILE, 'r');
// Do we only want to count 'unique' visitors?
if (ONLY_UNIQUE)
{
// Get visitor ip and check against our ip log
$ip = get_ip();
$ips = trim(fp(IP_FILE, 'r'));
$ips = preg_split("#\n#", $ips, -1, PREG_SPLIT_NO_EMPTY);
$visited = (bool)(in_array($ip, $ips));
// They've not visited before
if (!$visited)
{
fp(IP_FILE, 'a', "$ip\n");
fp(COUNT_FILE, 'w', $count + 1);
}
// Memory saving
unset($ips);
}
else
{
// No, we wish to count all visitors
fp(COUNT_FILE, 'w', $count + 1, USE_FLOCK);
}
// Do we want to display the # visitors as graphics?
if (USE_IMAGES)
{
$count = preg_split("##", $count, -1, PREG_SPLIT_NO_EMPTY);
$len = count($count);
$display = '';
for ($i = 0; $i < $len; $i++)
{
$display .= '<img src="' . IMG_DIR . $count[$i] . IMG_EXT . '" border="0" alt="Simple PHP counter by SecondVersion.com" /> ';
}
echo "<a href=\"http://www.secondversion.com\" style=\"text-decoration: none;\" title=\"Simple PHP counter by SecondVersion.com\">$display</a>";
}
else
{
// Nope, let's just show it as plain text
echo "$count";
}
// EoF
?>