Codeignitor redirect()未按预期工作

我已经开始使用Codeigniter了。所以,我有两个控制器任务和项目。在我的任务控制器中,我有一个编辑现有任务的功能,在编辑任务后,我想重定向到项目控制器的显示方法,该方法将参数作为与任务关联的项目id。

这是我的任务控制器:

 public function edit($task_id,$task_project_id){
    $this->form_validation->set_rules('task_name', 'Task Name','trim|required');
    $this->form_validation->set_rules('task_description', 'Task Description','trim|required');
    if ($this->form_validation->run() == FALSE){
        $result=$this->task_model->get_task($task_id);
        $data['task_name']=$result->task_name;
        $data['due_on']=$result->due_on;
        $data['task_description']=$result->task_description;
        $data['id']=$task_id;
        $data['task_project_id']=$task_project_id;
        $data['main_view']="tasks/edit_task";
        $this->load->view('layout/user', $data);
    } else { 
            $data['task_project_id']=$task_project_id;
            $data['task_name']=$this->input->post('task_name');
            $data['due_on']=$this->input->post('due_on');
            $data['task_description']=$this->input->post('task_description');
            $data['id']=$task_id;
            if ($this->task_model->edit($data)){
            $this->session->set_flashdata('task_edited' ,'Task Edited Succesfully');
            redirect(projects/display/$task_project_id); THIS SEEMS TO BE THE PROBLEM .
        }else{
            $this->session->set_flashdata('task_edited_failure' ,'Task Not Edited Succesfully');
            redirect(projects/edit);
        }
    }
}

这是我的项目控制器及其索引和显示功能:

    public function index()
{
        $data['projects']=$this->projects_model->get_projects();
        $data['main_view']="projects/home_view";
        $this->load->view('layout/user.php',$data);
}
public function display($project_id){
        $data['task']=$this->task_model->get_tasks($project_id);
        $data['project']=$this->projects_model->get_project($project_id);
        $data['main_view']="projects/display";
        $this->load->view('layout/user.php',$data);
}

因此,在我的任务控制器中,我尝试使用redirect(projects/display/$task\u project\u id)重定向到projects控制器的显示方法,因为projects控制器的显示函数是 display($project_id) . 但这是重定向到我的项目控制器的索引函数。重定向有什么问题?我以为CI中的URL结构是 controller/function/parameter1/parameter2 .