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我在做Lynda.com學習PHP 2視頻並遇到問題，因爲導師似乎忽略了告訴我們他在視頻中執行的步驟之一。我已經在這裏上傳了相關視頻http://www.youtube.com/watch?v=fFKgAa7RAjo，但也會描述問題。在視頻的6點40分，登錄到我們的應用程序後，他到達public/admin/index.php，其上有兩個鏈接。一個鏈接允許他「查看日誌文件」，將他帶到public/admin/logfile.php，另一個鏈接允許他註銷。他沒有告訴我們如何製作這些鏈接。我可以明顯地做一個鏈接以查看日誌文件PHP註銷
<a href="logfile.php">View Logfile</a>
，但我不知道如何使將登錄我出去的鏈接，因爲這顯然會涉及到一些PHP。
我在login.php文件中包含index.php文件（它在登錄後重定向到index.php）和functions.php文件。你知道我會如何註銷嗎？
這是login.php中文件
<?php
require_once("../../includes/initialize.php");
if($session->is_logged_in()){
redirect_to("index.php");
}
//Remember to give your form's submit tag a name="submit" attribute
if (isset($_POST['submit'])) {//Form has been submitted.
$username = trim($_POST['username']);
$password = trim($_POST['password']);
//Check database to see if username/password exist
$found_user = User::authenticate($username, $password);
if ($found_user) {
$session->login($found_user);
log_action('Login', "{$found_user->username} logged in.");
redirect_to("index.php");
} else {
//username/password combo was not found in the database
$message = "Username/password combination incorrect.";
}
} else {//Form has not been submitted.
$username = "";
$password = "";
}
?>
<?php include_layout_template('admin_header.php'); ?>
<h2>Staff Login</h2>
<?php echo output_message($message); ?>
<form action="login.php" method="post">
<table>
<tr>
<td>Username:</td>
<td>
<input type="text" name="username" maxlength="30" value="<?php
echo htmlentities($username); ?>" />
</td>
</tr>
<tr>
<td>Password:</td>
<td>
<input type="password" name="password" maxlength="30" value="<?php
echo htmlentities($password); ?>" />
</td>
</tr>
<tr>
<td colspan="2">
<input type="submit" name="submit" value="login" />
</td>
</tr>
</table>
</form>
</div>
<?php include_layout_template('admin_footer.php'); ?>
的functions.php
<?php
function strip_zeros_from_date($marked_string=""){
//first remove the marked zeros
$no_zeros = str_replace('*0', '', $marked_string);
//then remove any remaining marks
$cleaned_string = str_replace('*', '', $no_zeros);
return $cleaned_string;
}
function redirect_to($location= NULL) {
if($location != NULL) {
header("Location: {$location}");
exit;
}
}
function output_message($message=""){
if (!empty($message)) {
return "<p class=\"message\">{$message}</p>";
} else {
return "";
}
}
function __autoload($class_name) {
$class_name = strtolower($class_name);
$path = LIB_PATH.DS."{$class_name}.php";
if(file_exists($path)){
require_once($path);
} else {
die("The file {$class_name}.php could not be found.");
}
}
function include_layout_template($template=""){
include(SITE_ROOT.DS.'public'.DS.'layouts'.DS.$template);
}
function log_action($action, $message=""){
$logfile = SITE_ROOT.DS.'logs'.DS.'log.txt';
$new = file_exists($logfile) ? false : true;
if($handle = fopen($logfile, 'a')) { //apppend
$timestamp = strftime("%Y-%m-%d %H:%M:%S", time());
$content = "{$timestamp} | {$action}: {$message}\n";
fwrite($handle,$content);
fclose($handle);
if($new) {chmod($logfile, 0755); }
} else {
echo "Could not open log file for writing.";
}
}
?>
的index.php
<?php
require_once('../../includes/initialize.php');
if (!$session->is_logged_in()) { redirect_to("login.php"); }
?>
<?php include_layout_template('admin_header.php'); ?>
<h2>Menu</h2>
</div>
<?php include_layout_template('admin_footer.php'); ?>
更新
Initialize.php
<?php
//Directory_separator is a PHP pre-defined constant
// (\ for windows,/for Unix)
defined('DS') ? null : define('DS', DIRECTORY_SEPARATOR);
defined('SITE_ROOT') ? null :
define('SITE_ROOT', DS.'hsphere'.DS.'local'.DS.'home'.DS.'c263430'.DS.'quoralist.com');
// define('SITE_ROOT', realpath(dirname(__FILE__).'/../'));
//echo SITE_ROOT."<br/>";
defined('LIB_PATH') ? null : define('LIB_PATH', SITE_ROOT.DS.'includes');
// die(LIB_PATH);
//echo LIB_PATH."<br/>";
require_once(LIB_PATH.DS."config.php");
require_once(LIB_PATH.DS."functions.php");
require_once(LIB_PATH.DS."session.php");
require_once(LIB_PATH.DS."database.php");
require_once(LIB_PATH.DS."database_object.php");
require_once(LIB_PATH.DS."user.php");
//echo("You die here");
?>
user.php的
<?php
require_once(LIB_PATH.DS.'database.php');
class User extends DatabaseObject{
protected static $table_name="users";
public $id;
public $username;
public $password;
public $first_name;
public $last_name;
public function full_name() {
if(isset($this->first_name) && isset($this->last_name)) {
return $this->first_name . " " . $this->last_name;
} else {
return "";
}
}
public static function authenticate($username="",$password="") {
global $database;
$username = $database->escape_value($username);
$password = $database->escape_value($password);
$sql = "SELECT * FROM users ";
$sql .= "WHERE username = '{$username}' ";
$sql .= "AND password = '{$password}' ";
$sql .= "LIMIT 1";
$result_array = self::find_by_sql($sql);
return !empty($result_array) ? array_shift($result_array) : false;
}
//common database methods
public static function find_all(){
return self::find_by_sql("SELECT * FROM ".self::$table_name);
}
public static function find_by_id($id=0) {
global $database;
$result_array = self::find_by_sql("SELECT * FROM ".self::$table_name." WHERE id={$id} LIMIT 1");
return !empty($result_array) ? array_shift($result_array) : false;
}
public static function find_by_sql($sql=""){
global $database;
$result_set = $database->query($sql);
$object_array = array();
while ($row = $database->fetch_array($result_set)) {
$object_array[] = self::instantiate($row);
}
return $object_array;
}
private static function instantiate($record){
$object = new self;
//$object->id = $record['id'];
//$object->username = $record['username'];
//$object->password = $record['password'];
//$object->first_name = $record['first_name'];
//$object->last_name = $record['last_name'];
foreach($record as $attribute=>$value) {
if($object->has_attribute($attribute)) {
$object->$attribute = $value;
}
}
return $object;
}
private function has_attribute($attribute) {
$object_vars = get_object_vars($this);
return array_key_exists($attribute, $object_vars);
}
}
?>
session.php文件
<?php
class Session {
private $logged_in=false;
public $user_id;
function __construct() {
session_start();
$this->check_login();
if($this->logged_in){
//actions to take right away if user is logged in
} else {
//actions to take right away if user is not logged in
}
}
public function is_logged_in() {
return $this->logged_in;
}
public function login($user) {
//database should find user based on username/password
if($user){
$this->user_id = $_SESSION['user_id'] = $user->id;
$this->logged_in = true;
}
}
public function logout(){
unset($_SESSION['user_id']);
unset($this->user_id);
$this->logged_in = false;
}
private function check_login(){
if(isset($_SESSION['user_id'])){
$this->user_id = $_SESSION['user_id'];
$this->logged_in = true;
} else {
unset($this->user_id);
$this->logged_in = false;
}
}
}
$session = new Session();
?>
這將有助於'initialize.php'和/或'User'類的定義 – NullUserException 2011-03-12 00:34:13
@NullUserException謝謝。我添加了initialize.php，user.php（定義用戶類）和session.php – Leahcim 2011-03-12 00:45:59