在下面，我有代码并对其进行了很多编辑，除了数据库中的用户名字段没有更新之外，一切正常，数据库设置正确，我也尝试使用 session 而不是 vars。
请不要插入我在这里缺少的任何想法？
<?php
session_start();
?>
<?php
//session_start();
$id = $_SESSION['user_id'];
$_SESSION['user_id']= $id;
//$_SESSION['user_name'] = $full_name;
// $username = $_SESSION['user_name'];
//$username = $user_name;
$_SESSION['user_level'] = $user_level;
$_SESSION['HTTP_USER_AGENT'] = md5($_SERVER['HTTP_USER_AGENT']);
$_SESSION['session_name'] = $user_name;
/******************************************************************************
* Copyright (C) 2012 J~Net *
* *
* This script gathers information from the user, including, but not limited *
* to their IP, and how long they viewed the page. It then records it to a *
* MySQL database for our records / to monitor traffic to a site. *
* Usage : require("tracker.php"); Last modified : Nov 24th, 2012 *
******************************************************************************
* This source and program come as is, WITHOUT ANY WARRANTY and/or WITHOUT *
* ANY IMPLIED WARRANTY. *
* *
* Users of said software should realize that they cannot and will not hold *
* bombthebox.com reliable or responsible for any purpose WHAT SO EVER. *
* Please read all documentation and use said software responsibly. *
* *
\******************************************************************************/
/* Add the static code from the include file */
require("include.php");
/* Obtain and format the current date & time */
$date_time = date("Y-m-d H:i:s");
/* SQL Statement to find out if the visitor is new or existing */
$SQL = "SELECT COUNT(*) AS previous_visitor FROM $db_tabl WHERE ip_address='$REMOTE_ADDR';";
/* Execute the SQL statement */
$results = mysql_db_query($db_name, "$SQL", $connection);
/* Error trapping on SQL */
if (!$results)
echo("ERROR: " . mysql_error() . "\n$SQL\n");
/* Obtain the data from the record set */
while ($row = mysql_fetch_array($results))
$previous_visitor = $row["previous_visitor"];
/* If the user is existing, then do this stuff */
if ($previous_visitor > 0)
{
/* SQL Statement to pull the information on the user's last visit */
$SQL = "SELECT * FROM $db_tabl WHERE ip_address='$REMOTE_ADDR' ORDER BY id ASC;"; //AND page_viewed='$HTTP_REFERER'
/* Execute the SQL statement */
$results = mysql_db_query($db_name, "$SQL", $connection);
/* Error trapping on SQL */
if (!$results)
echo("ERROR: " . mysql_error() . "\n$SQL\n");
/* Pull the data from the record set */
while ($row = mysql_fetch_array($results))
{
$last_id = $row["id"];
$last_time = $row["date_time"];
}
/* Split up the last timestamp for this user */
$year = substr($last_time, 0, 4);
$month = substr($last_time, 5, 2);
$day = substr($last_time, 8, 2);
$hour = substr($last_time, 11, 2);
$minute = substr($last_time, 14, 2);
$second = substr($last_time, 17, 2);
/* Convert the user's last timestamp into seconds */
$previous_time = mktime($hour, $minute, $second, $month, $day, $year);
// session_start();
$user = $_SESSION['user_name'];
// $user_name = $data['user_name'];
$id = $_SESSION['user_id'];
$_SESSION['user_name'] = $full_name;
$user_ip = $_SERVER['REMOTE_ADDR'];
$rq= $_SERVER['REQUEST_URI'];
$_SESSION['session_name'] = $user_name = $un;
$un = $user_name = $_SESSION['user_name'];
//$username = $_SESSION['logged_username'];
$_SESSION['user_name'] = $full_name;
// $user = $full_name;
$username = $_SESSION['user_name'] = $yourname;
$info["user_name"] = $yourname;
$yourname = $_SESSION['user_name'] = $username;
/* Split up the current timestamp for this user */
$year = substr($date_time, 0, 4);
$month = substr($date_time, 5, 2);
$day = substr($date_time, 8, 2);
$hour = substr($date_time, 11, 2);
$minute = substr($date_time, 14, 2);
$second = substr($date_time, 17, 2);
/* Convert the user's current timestamp into seconds */
$current_time = mktime($hour, $minute, $second, $month, $day, $year);
/* Calculate how much time as elapsed since their last visit */
$time_difference = $current_time - $previous_time;
}
/* Update the last record with the elapsed time, assuming the value is less than an hour. */
if ($time_difference != "" && $time_difference < 3600)
{
/* SQL Statement to update an existing record */
$SQL = "UPDATE $db_tabl SET time_spent=$time_difference WHERE id='$last_id';";
/* Execute the SQL statement */
$results = mysql_db_query($db_name, "$SQL", $connection);
/* Error trapping on SQL */
if (!$results)
echo("ERROR: " . mysql_error() . "\n$SQL\n");
}
/* SQL Statement to insert the data */
$SQL = "INSERT INTO $db_tabl (ip_address, page_viewed, date_time, username, user_id) VALUES ('$user_ip', '$rq', '$date_time','$yourname','$id') ;";
/* Execute the SQL statement */
$results = mysql_db_query($db_name, "$SQL", $connection);
/* Error trapping on SQL */
if (!$results)
echo("ERROR: " . mysql_error() . "\n$SQL\n");
/* Close off the database */
mysql_close($connection);
?>