看到很多网站有“您是第n位访问者”

1. 沙发

2. <?php $counterfile="1.txt"; 
if(  !file_exists($counterfile)){ $fw=fopen($counterfile,"w"); fwrite($fw,0); fclose($fw);}  $fp=fopen($counterfile,"r"); $num=fread($fp,8); fclose($fp); $num+=1; echo "本系统共使用".$num."次
"; 
$fpw=fopen($counterfile,"w"); fwrite($fpw,$num); fclose($fpw);
?>

3. 点击一下