Social networking Count button

Sample Code of hit counter for PHP


?page=PAGEID parameter, for example counter.php?page=test');
}

/* Remove any illegal chars from the page ID */
$page = preg_replace('/[^a-zA-Z0-9\-_\.]/','',$_GET['page']);

/* Stop if $page is not valid */
if ( ! strlen($page) )
{
die('ERROR: Page ID is missing or contains only invalid chars. Please use only these chars for the page ID: a-z, A-Z, 0-9, ".", "-" and "_"');
}

/* Set values for cookie and log file names */
$cname = 'tcount_unique_'.$page;
$logfile = 'logs/' . $page . '.txt';

/* Does the log file exist? */
if ( ! file_exists($logfile) )
{
die('ERROR: Log file not found. Make sure there is a file called ' . $page . '.txt inside your logs folder. On most servers file names are CaSe SeNSiTiVe!');
}

/* Open log file for reading and writing */
if ($fp = @fopen($logfile, 'r+'))
{
/* Lock log file from other scripts */
$locked = flock($fp, LOCK_EX);

/* Lock successful? */
if ($locked)
{
/* Let's read current count */
$count = intval( trim( fread($fp, filesize($logfile) ) ) );

/* If counting unique hits is enabled make sure it's a unique hit */
if ( $count_unique == 0 || ! isset($_COOKIE[$cname]) )
{
/* Update count by 1 and write the new value to the log file */
$count = $count + 1;
rewind($fp);
fwrite($fp, $count);

/* Print the Cookie and P3P compact privacy policy */
header('P3P: CP="NOI NID"');
setcookie($cname, 1, time()+60*60*$unique_hours);
}
}
else
{
/* Lock not successful. Better to ignore than to damage the log file */
$count = 1;
}

/* Release file lock and close file handle */
flock($fp, LOCK_UN);
fclose($fp);
}
else
{
die("ERROR: Can't read/write to the log file ($logfile). Make sure this file is writable by PHP scripts. On UNIX servers, CHMOD the log file to 666 (rw-rw-rw-).");
}

/* Is zero-padding enabled? If yes, add zeros if required */
if ($min_digits)
{
$count = sprintf('%0'.$min_digits.'s', $count);
}

/* Print out Javascript code and exit */
echo 'document.write(\''.$count.'\');';
exit();
?>