无法通过视图中的按钮将id传递给codeigniter中的控制器

Question

so i am trying to pass id from a link i created in views to my controller method however i get the error that unidentified variable id

below is the link in view

<a href="<?php echo base_url();?>doctors/display_schedule/<?php echo $id['d_id']; ?>" >set schedule</a>

and this is the controller method:

public function display_schedule($d_id)
    {
        $data['id'] = $this->doctor_model->get_info_by_id($d_id);
        $this->load->view("doctors_schedule_view",$data);
    }

ps, if you want a look at my model inform me

Answer 1

When passing data in this way, no matter what the variable names are you need to explicitly assign the variable in the controller otherwise i'll remain undefined.

Let's assume:

<a href="<?php echo base_url();?>doctors/display_schedule/<?php echo $id['d_id']; ?>" >set schedule</a>

points to doctors/display_schedule/1234

So, if you want to use 1234 you need to enable the URL helper and add this in the display_schedule method in your controller:

$d_id = $this->uri->segment(3);

This way, whatever was passed to the controller in the third uri segment will be assigned to $d_id in the controller.

BE AWARE that you need to sanitize the input after assigning it to the variable in order to prevent malicious uses like code injecting and whatnot.