PHP实现访客计数器

访客计数器

<?php
//访客计数器函数MyCounter()
//-------------------------
function MyCounter(){
$counterFile="tmp/counter.txt";
if(!file_exists($counterFile))
exec("echo 0 > $counterFile"); //重定向
$fp=fopen($counterFile,"rw");
$num=fgets($fp,5); //第5个字节
$num+=1;
print "$num<br>\n";
exec("rm -rf $counterFile"); //rm -rf linux的删除文件命令
exec("echo $num > $counterFile");
}
?>