1.session实现
counter1.php
<body style='font-size:14px;'>
<?php
session_start();
$counter=$_SESSION["counter"];
if($counter==""){
$counter=1;
$_SESSION["counter"]=$counter;
}
else{
$counter=$counter+1;
$_SESSION["counter"]=$counter;
}
echo "你是第".$counter."位来访者";
echo "<input type=button onclick=\"location.href='abandon.php'\" value='重新计数'>";
?>
</body>
abandon.php
<?php
session_start();
unset($_SESSION["counter"]);
session_destroy();
header("location:counter1.php");
?>
2.cookies实现
counter2.php
<?php
/* config */
/*
echo getenv('REMOTE_ADDR')."<br/>";
echo $_SERVER['PHP_SELF']."<br/>";//取当前文件名
echo basename($_SERVER['PHP_SELF'])."<br/>";//取当前文件名，区别在于，上一个有"/"
echo realpath(basename($_SERVER["PHP_SELF"]))."<br/>";//取物理路径;
print_r($_COOKIE);//输出所有的cookies
*/
/* config */
$varnum=$_COOKIE["counter"];
if($varnum==""){
$varnum=1;
setcookie("counter", 1, time()+3600);
}
else{
$varnum+=1;
setcookie("counter", $varnum, time()+3600);
}
echo "您是第".$varnum."位造访者";
echo "<input type=button onclick=\"location.href='clear.php'\" value='重新计数'>";
?>
clear.php
<?php
setcookie("counter", "timeout", time()-1);
header("location:counter2.php");
?>
3.防刷新计数器
counter3.php
<?php
$cn=mysql_connect("localhost","root","123456");
$db=mysql_select_db("test");
$sql="update userinfo set age=age+1 where id=1";
$show="select * from userinfo where id=1";
$varnum=$_COOKIE["counter"];
if($varnum!=1)
{
$result=mysql_query($sql);
$result=mysql_query($show);
$row=mysql_fetch_array($result);
echo "您是第".$row["age"]."位来访者";
setcookie("counter",1, time()+10);
}
else{
$result=mysql_query($show);
$row=mysql_fetch_array($result);
echo "您是第".$row["age"]."位来访者";
}
echo "<input type=button onclick=\"location.href='restart.php'\" value='重新计数'>";
mysql_free_result($result);
mysql_close($cn);
?>
restart.php
<?php
setcookie("counter", "timeout", time()-1);
header("location:counter3.php");
?>
