一个简单的计数器代码

<?
//存放计数的文本文件
$count="count.txt";
//计数器的位数，如果不填则默认为6位
$wei="";
if ($wei=="") { $wei=6; }
if (!file_exists($count)) { $fp=fopen($count,"w+"); fputs($fp,1,100); fclose($fp); } //初始化计数器值
//将计数器加1
$fp=fopen($count,"r+");
$cc=fgets($fp,100);
$cc=trim($cc);
if ($cc=="") { $cou=1; }
else { $cou=$cc+1; }
rewind($fp);
fputs($fp,$cou,100);
fclose($fp);
//读出计数器的值
$fp=fopen($count,"r+");
$cou=fgets($fp,100);
$cou=trim($cou);
fclose($fp);
$w=strlen($cou);
while($w<$wei)
{
      $cou="0".$cou;
      $w++;
}
//显示图片
$www=strlen($cou);
$i=1;
echo "document.write(\"<p align=center>您是第 \");\n";
while($i<$www)
{
      $ym=substr($cou,$i,1);
      echo "document.write(\"[b]$ym[/b]\");\n";
//如果显示图片的话则echo "document.write(\"<img src='images/$ym.gif'>\");\n";
      $i++;
}
echo "document.write(\" 位访问者\");\n";
/*
在显示页用下面代码进行调用
<script src="count.php"></script>
*/
?>