Contador de visitas únicas em php (sem mysql)

<table>
<tr>
<th colspan="2">Unique visitors</th>
</tr>
<tr>
<td><b>Today</b></td>
<td>
<?php
$file_count = fopen('counter/count.db', 'rb');
$data = '';
while (!feof($file_count)) $data .= fread($file_count, 4096);
fclose($file_count);
list($today, $yesterday, $total, $date, $days) = split("%", $data);
echo $today;
?>
</td>
</tr>
<tr>
<td><b>Yesterday</b></td>
<td>
<?php
echo $yesterday;
?>
</td>
</tr>
<tr>
<td><b>Total</b></td>
<td>
<?php
echo $total;
?>
</td>
</tr>
<tr>
<td><b>Daily average</b></td>
<td>
<?php
echo ceil($total/$days);
?>
</td>
</tr>
</table>

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<?php
$ip = $_SERVER['REMOTE_ADDR'];

$file_ip = fopen('counter/ip.db', 'rb');
while (!feof($file_ip)) $line[]=fgets($file_ip,1024);
for ($i=0; $i<(count($line)); $i++) {
list($ip_x) = split("\n",$line[$i]);
if ($ip == $ip_x) {$found = 1;}
}
fclose($file_ip);

if (!($found==1)) {
$file_ip2 = fopen('counter/ip.db', 'ab');
$line = "$ip\n";
fwrite($file_ip2, $line, strlen($line));
$file_count = fopen('counter/count.db', 'rb');
$data = '';
while (!feof($file_count)) $data .= fread($file_count, 4096);
fclose($file_count);
list($today, $yesterday, $total, $date, $days) = split("%", $data);
if ($date == date("Y m d")) $today++;
else {
$yesterday = $today;
$today = 1;
$days++;
$date = date("Y m d");
}
$total++;
$line = "$today%$yesterday%$total%$date%$days";

$file_count2 = fopen('counter/count.db', 'wb');
fwrite($file_count2, $line, strlen($line));
fclose($file_count2);
fclose($file_ip2);
}
?>

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<?php include 'contador.php'; ?>

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<?php include 'mostra_contador.php'; ?>

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