重定向 在 if 语句内

我试图弄清楚如何在页面加载 5 秒后使此页面重定向到某个页面，只有当 if （$this->usersmodel->activateUser（$userID， $registrationKey）） 返回 TRUE 时。我不能使用 jquery，因为问题是如果它返回 false 然后我不希望它重定向。

<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed'); 
class Activate extends CI_Controller { 
public function __construct()
{
    parent::__construct();
    $this->load->model('users/usersmodel');
}
public function index()
{
    //Config Defaults Start
    $msgBoxMsgs = array();//msgType = dl, info, warn, note, msg
    $cssPageAddons = '';//If you have extra CSS for this view append it here
    $jsPageAddons =  '<script src='.base_url().'assets/peach/js/validate/activate.js></script>';//If you have extra JS for this view append it here
    $metaAddons = '';//Sometimes there is a need for additional Meta Data such in the case of Facebook addon's
    $siteTitle = '';//alter only if you need something other than the default for this view.
    //Config Defaults Start

    //examples of how to use the message box system (css not included).
    //$msgBoxMsgs[] = array('msgType' => 'dl', 'theMsg' => 'This is a Blank Message Box...');
    /**********************************************************Your Coding Logic Here, Start*/
    $userID     = $this->uri->segment(2);
    $registrationKey    = $this->uri->segment(3);
    if ( ((!is_numeric($userID)) || (is_null($userID))) || ((is_null($registrationKey)) || (!preg_match('/^[A-Za-z0-9]+$/', $registrationKey))) ) 
    {
        $bodyContent = $this->config->item('defaultTemplate') ."/404";//which view file  
    } 
    else 
    {
        $registrationDetails = $this->usersmodel->getRegistrationDetails($userID);
        if (!is_null($registrationDetails))
        {
            if ($this->usersmodel->activateUser($userID, $registrationKey))
            {
                $message = 'User was activated successfully! You may now login!';   
                $bodyContent = $this->config->item('defaultTemplate') ."/usermanagement/forms/activate";//which view file      
            }
            else
            {
                $message = 'User was not activated successfully! Please try again with the right credentials!';  
                $bodyContent = $this->config->item('defaultTemplate') ."/usermanagement/forms/activate";//which view file  
            }
            $this->data['message'] = $message;                                
        }
        else
        {
            $bodyContent = $this->config->item('defaultTemplate') ."/404";  
        }
    }
    $bodyType = "full";//type of template   
    /***********************************************************Your Coding Logic Here, End*/
    //Double checks if any default variables have been changed, Start.
    //If msgBoxMsgs array has anything in it, if so displays it in view, else does nothing.      
    if(count($msgBoxMsgs) !== 0)
    {
        $msgBoxes = $this->msgboxes->buildMsgBoxesOutput(array('display' => 'show', 'msgs' =>$msgBoxMsgs));
    }
    else
    {
        $msgBoxes = array('display' => 'none');
    }
    if($siteTitle == '')
    {
        $siteTitle = $this->metatags->SiteTitle(); //reads 
    }
    //Double checks if any default variables have been changed, End.
    $this->data['msgBoxes'] = $msgBoxes;
    $this->data['cssPageAddons'] = $cssPageAddons;//if there is any additional CSS to add from above Variable this will send it to the view.
    $this->data['jsPageAddons'] = $jsPageAddons;//if there is any addictional JS to add from the above variable this will send it to the view.
    $this->data['siteTitle'] = $siteTitle;//defaults can be changed via models/metatags.php
    $this->data['bodyType'] = $bodyType;
    $this->data['bodyContent'] = $bodyContent;
    $this->load->view($this->config->item('defaultTemplate') .'/usermanagement/index', $this->data);
}
}
/* End of file activate.php */ 
/* Location: ./application/controllers/activate.php */