thinkphp框架下实现登录、注册、找回密码功能，thinkphp找回密码

<&#63;php
namespace Home\Controller;
use Think\Controller;
class LoginController extends Controller {
  //处理登录
  public function signin(){ 
    if(IS_GET){ 
      $this->display();
    } 
    if(IS_POST){
      /* 调用登录接口登录 */
      $User = M('user') ;  
      //I方法接收页面传递来的值
      $num = I('num') ; 
      $password = I('password') ;
      //查找user表中num等于$num的值
      $datanum = $User->where(array('num'=>$num))->find();
      //判断$datanum的值
      if ($datanum){
        if (md5($password) === $datanum['password']) { 
          if ($datanum['status'] == 0) {
            $this->error('用户处于未审核状态，请联系管理员');
          }elseif($datanum['status'] == 2){
            $this->error('用户处于禁用状态，请联系管理员');
          }else{
            $this->autoLogin($datanum) ; //调用私有方法自动登录. 
            $uid = $datanum['id'];
            if($_SESSION['user_auth']['uid'] && $_SESSION['user_auth']['role'] == 'user'){
              $this->success('登录成功！', U('Index/index'));
            }else{
              $this->error('存储错误.');
            }
          }
        }else{
          $this->error('密码填写不正确,请重新填写'); 
          exit();
        }
      }else{
        $this->error('用户不存在，请注册',U('signup'));
      }
    }
  }
 
  public function autoLogin($user){  
    /* 记录登录SESSION */
    $auth = array(
      'uid'       => $user['id'],
      'num'    => $user['num'], 
      'role'      => 'user' , //记录用户类型 
    );
    session('user_auth', $auth);
    session('user_auth_sign', data_auth_sign($auth)); 
  }
 
  /*
  * 用户注册 
  */
  public function signup(){
    if(is_user_login()){
      $this->redirect('Index/index');
    }
    if(IS_GET){
      //注册页面
      $this->display();
    }
    if(IS_POST){
      //判断用户 
      $data['num'] = I('num') ; 
      $User = M('user') ;
      $datanum = $User->where($data)->find();
      if ($datanum){
        $this->success('您已经注册过，请直接登录',U('signin'));
      }else{
        $data['password'] = md5(I('password')); 
        $data['name']  = I('name');
        $data['email']  = I('email');
        $data['addtime'] = time();
        $uid = $User->add($data);
        if($uid) 
          $this->success('注册成功',U('signin')) ; 
        else  
          $this->error('注册失败') ; 
      }
    }
  }
 
  public function logout(){
    if(is_user_login()){
      $User = M('user') ;
      session('user_auth', null);
      session('user_auth_sign', null);
      session('[destroy]');
      $this->success('登出成功！', U('signin'));
    } else {
      $this->redirect('signin');
    }
  }
 
  //忘记密码
  public function wjpas(){ 
    if(IS_GET){ 
      $this->display();
    } 
    if(IS_POST){
      $User = M('user') ;
      $num = I('num') ;
      $data['password'] = md5(I('password')) ; 
      $email = I('email') ;
      $datanum = $User->where(array('num'=>$num))->find();
      if ($datanum){
        if ($email === $datanum['email']) {
          $User->where(array('num'=>$num))->save($data); // 根据条件更新记录
          $this->success('密码修改成功',U('signin')) ; 
        }else{
          $this->error('邮箱填写不正确,请重新填写'); 
          exit();
        }
      }else{
        $this->error('用户不存在，请注册',U('signup'));
      }
    }
  }
}
&#63;>