php中后台方法控制页面跳转

<?php
 class IndexAction extends Action {
	 function index(){
		 $this->display();
	 }
	 
	function do_login(){
		//获取用户名和密码信息,和数据库中比对
		// echo 111111111;
		 dump($_POST);
		dump($_SESSION);
		#sleep(10);
		$username=$_POST['username'];
		$password=$_POST['password'];
		$code=$_POST['code'];
		if($_SESSION['verify']!==md5($code)){
			$this->error('验证码错误');
		}
		
		$m=new Model('user');
		$where['username']=$username;
		$where['password']=md5($password);
		
		$arr = $m->where($where)->find();
		
		$i=$m->where($where)->count();
		
		if ($i>0){
			$_SESSION['username']=$username;
			$_SESSION['authority'] = $arr['authority'];
			$this->redirect('Main/index');
		}else{
			$this->error('该用户不存在');
		}
	}

	function checkUser(){
		$username=$_POST['username'];
		$m=new Model('user');
		$where['username']=$username;
		$i=$m->where($where)->count();
		if ($i>0){
			echo "1";
		}else{
			echo "0";
		}
	}
	
	function checkPasswd(){
		$username=$_POST['username'];
		$password=$_POST['password'];
		
		$m=new Model('user');
		$where['username']=$username;
		$where['password']=md5($password);
		$i=$m->where($where)->count();
		if ($i>0){
			echo "1";
		}else{
			echo "0";
		}
	}
	
	function checkCode(){
		$code=$_POST['code'];
		if($_SESSION['verify']!==md5($code)){
			echo "0";
		}else{
			echo "1";
		}
	}
}
?>


登陆成功后跳转到		$this->redirect('Main/index'); 表示main类的index方法

<?php
// 本类由系统自动生成，仅供测试用途
class MainAction extends Action {
	function _before_index(){
		if(!isset($_SESSION['username']) || $_SESSION['username']=='')
		{
			$this->redirect('Index/index');
		}
	}
	
    public function index(){
		echo 'dasd2313`1312';
		#sleep(10);
		$this->display();
    }
}


dasd2313`1312我跳转到Main/index


php的页面跳转通过后台方法控制