如何给网页加个计数器？

给段简单的.

<?php

//the counter

$cfile="res/counter.txt";

function displayCounter($counterFile)

{

$fp=fopen($counterFile,"r");

$num =fgets($fp,5);

fclose($fp);

if(!$bVisited)$num += 1;

print("<font style=\"color:#00FF00;background:#000000\">$num</font>");

$fp=fopen($counterFile,"w");

fputs($fp,$num);

fclose($fp);

}

if(!file_exists($cfile))

{

$fp=fopen($cfile,"w+");

fputs($fp,'0');

fclose($fp);

chmod($cfile,0777);

}

displayCounter($cfile);