用法
<?
include("counter.php");
Counter(__FILE__);//为文件增加一个计数
if($PHP_SELF=="/index.php")
{
$count=Counter("INDEX_COUNT");//为首页增加一个计数
}
else
{
$count=Counter("INDEX_COUNT","",0);//取得首页计数
}
echo "你是第$count个访问者";
?
--------counter.php-----------
<?
if(!isset($PHP_INCLUDE_COUNTER_PHP))
{$PHP_INCLUDE_COUNTER_PHP=__FILE;

$counter_error_state=0;
$counter_error_msg="";
function Counter($file,$query="",$add=1)
{
        $db_name="database";
        $db_user="username";
        $db_pass="password";
        $db_table="counter";

        if(empty($file))
        {
                $counter_error_state=-100;
                $counter_error_msg="缺少第一个参数或参数为空";
                return -100;
        }
        global $PHP_SELF,$QUERY_STRING,$counter_error_state,$counter_error_msg;
        if(empty($db_user)||!$db_user||$db_user=="")$res=@mysql_connect("localhost");
        else $res=@mysql_connect("localhost",$db_user,$db_pass);
        if(!$res)
        {
                $counter_error_states=-10;
                $counter_error_msg="不能连接数据库";
                return -10;
        }
        if(!@mysql_select_db($db_name))
        {
                $counter_error_states=-11;
                $counter_error_msg="不能选择数据库";
                return -11;
        }
        else
        {
                if(!$db_res=@mysql_query("SELECT * FROM ".$db_table))
                {
                        if(!$db_res=@mysql_query("CREATE TABLE ".$db_table." (id INTEGER AUTO_INCREMENT,PRIMARY KEY (id),file VARCHAR(255),query VARCHAR(255),time VARCHAR(255),count INT)"))
                        {
                            &