CodeIgniter自定义404消息

Question

I am trying to display an error message on CodeIgniter error page. I am trying this:

Controller/entries.php

public function show_entry()

{
    $id = $this->uri->segment(3);

if ($id !== FALSE)
{
    ..
}
else
{
log_message('error', 'The post ID is missing.');
}

Shouldnt this display my error message 'The post ID is missing' on the CodeIgniter's default 404 error message ie. "The page you requested was not found."

Answer 1

No. The logging class is for writing messages to a log file (ideally somewhere that the user can't read it as it can have information on the inner-workings of your cite). It is something which is really beneficial to you above all.

To display a custom error message, you'll need to either use show_error or, probably more likely in this case, show_404 (both methods documented here).