php simple counter

<?php
//1------cookie计数器
if (isset($_COOKIE["num"])) {
$num=$_COOKIE["num"]+1;
}else {
$num=1;
}
setcookie("num",$num);
echo "You are the ".$num." times visit."."</br>";
//2-------文本计数器
$file="../counter/count.dat";
if (!file_exists($file)) {
$num_txt=1;
}else {
$num_txt=file_get_contents($file);
$num_txt++;
}
$fp=fopen($file, "w");
fwrite($fp, $num_txt);
fclose($fp);
echo "You are the ".$num_txt." times visit."."</br>";
//3-------防刷新计数器
$file = "../counter/count.dat";
if (! file_exists ( $file )) {
$fp = fopen ( $file, "w" );
fwrite ( $fp, "0" );
fclose ( $fp );
}
$num_txt = file_get_contents ( $file );
session_get_cookie_params ( 24 * 3600 );
session_start ();
if (! isset ( $_SESSION ["visited"] )) {
$num_txt ++;
$fp = fopen ( $file, "w" );
fwrite ( $fp, $num_txt );
fclose ( $fp );
$_SESSION ["visited"] = "true";
}
echo "You are the " . $num_txt . " times visit." . "</br>";
//4--------图片计数器，同上，需要转杯0-9数字对应的图片
//5---------多用户计数器，存在数据库中
?>