php简略计数器

<?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?>