本文以实例形式讲述ThinkPHP实现的包括用户的注册、登录以及留言等功能，这里需要大家注意的是，在存在用户模型的情况下实例化一个用户类的时候使用D方法来实现。
UserActiion.class.php页面：
<?phpclass UserAction extends Action{public function add(){$user = D("user");$user->create();$result = $user->add();if($result){$this->assign("jumpUrl","__APP__/index/index");$this->success('注册成功！');}else{//echo $user->getError();$this->assign("jumpUrl","__APP__/user/register");$this->error($user->getError());}}public function register(){$this->display();}public function login(){$this->display();}public function checklogin(){$username = $_POST['username'];$passwd = $_POST['passwd'];$user = D("user");//$User->where('id=8')->find();这里的where 语句要注意一下，如果是其他字段的话后面一定要有单引号$userinfo = $user->where("username ='$username'")->find();if(!empty($userinfo)){if($userinfo['passwd'] == $passwd){Cookie::set('userid',$userinfo['id'],time()+3600*24);Cookie::set('username',$username,time()+3600*24);Cookie::set('lastlogintime',time(),time()+3600*24);$this->assign("jumpUrl","__APP__/index/index");$this->success('登陆成功！');}else{$this->assign("jumpUrl","__APP__/user/login");$this->error('密码出错，请重新输入！');}}else{$this->assign("jumpUrl","__APP__/user/login");$this->error('用户名不存在！');}}public function loginout(){Cookie::delete('username');Cookie::delete('lastlogintime');$this->assign("jumpUrl","__APP__/index/index");$this->success('您已经成功退出，欢迎您的下次登录！');}} IndexAction.class.php页面：
<?php// 本类由系统自动生成，仅供测试用途class IndexAction extends Action{public function insert() { $content = new ContentModel();$result = $content->create();if(!$result){$this->assign("jumpUrl","__URL__/index");$this->error($content->getError());//如果创建失败，表示验证没有通过，输出错误信息}else{//验证通过，进行其他操作$content->userid=Cookie::get('userid');$content->add();$this->assign("jumpUrl","__URL__/index");$this->success('添加成功！');}} // 数据查询操作 public function index() {$content = new ContentModel();$list = $content->findAll(); //用户的cookie$username = Cookie::get('username');$lastlogintime = Cookie::get('lastlogintime');$this->assign('list',$list); $this->assign('title','我的首页');$this->assign('username',$username);$this->assign('lastlogintime',$lastlogintime);$this->display(); } // 删除操作public function delete(){$content = new ContentModel();$id = $_GET['id'];if($content->where("id=$id")->delete()){$this->assign("jumpUrl","__URL__/index");$this->success('删除成功！');}else{$this->assign("jumpUrl","__URL__/index");$this->error('删除失败！');}} // 编辑操作public function edit(){$content = new ContentModel();$id = $_GET['id'];if($id != ''){//$data = $content->select($id);$data = $content->where("id=$id")->select();if(!empty($data)){$this->assign('data',$data);}else{echo "数据为空！";}}$this->assign('title','编辑页面');$this->display();}// 更新操作public function update(){$content = new ContentModel();//直接使用create(),自动会帮你进行数据的传值/*$content->create();$content->save(); // 根据条件保存修改的数据echo "更新数据成功！";*/// 使用post 传值过来，进行更新$id = $_POST['id'];if($id != ''){$data['id'] = $id;$data['title'] = $_POST['title'];$data['content'] = $_POST['content'];if($content->save($data))// 根据条件保存修改的数据{$this->assign("jumpUrl","__URL__/index");$this->success('更新数据成功！');}else{$this->assign("jumpUrl","__URL__/index");$this->success('更新数据失败！');}}else{echo "保存数据失败！";}}}?> ContentModel.class.php页面：
<?phpclass ContentModel extends Model{/** 自动验证* array(验证字段，验证规则，错误提示，验证条件，附加规则，验证时间)*/ protected $_validate = array(array('title','require','标题必须填写!'),array('content','require','内容必须填写!'), );/* * 自动填充* array(填充字段，填充内容，填充条件，附加规则)*/protected $_auto = array(array('addtime','time',1,'function'),);}?> UserModel.class.php页面：
<?phpclass UserModel extends Model{protected $_validate = array(array('username','','帐号名称已经存在！',0,'unique',1), ); }?>
这里需要注意的是，使用自动验证的时候 实例化时要用 $user = D("user") 而不能用 $user = M("user"),用M这种方法会报错，D函数用于实例化Model,M函数用户实例化一个没有模型的文件。
success.html页面：
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><meta http-equiv="refresh" content="20; url='{$jumpUrl}'" /><title>信息提示</title></head><body><div id="man_zone"><table width="40%" border="1" align="center" cellpadding="3" cellspacing="0" class="table" style="margin-top:100px;"><tr><th align="center" style="background:#cef">信息提示</th></tr><tr><td><p>{$message}<br />2秒后返回指定页面！<br />如果浏览器无法跳转，<a href="{$jumpUrl}" rel="external nofollow" >请点击此处</a>。</p></td></tr></table></div></body></html> 
