How to show 404 page in Codeigniter 4?

You can use the following command to display it.

PHP Code:

throw \CodeIgniter\Exceptions\PageNotFoundException::forPageNotFound(); 


But if you want to use show_404(), you can add the following code in file app/Common.php.

PHP Code:

<?php

use CodeIgniter\Exceptions\PageNotFoundException;

// Show 404 error

if (!function_exists('show_404')) {

    function show_404(string $error_text): string
    {

        throw PageNotFoundException::forPageNotFound($error_text);

    }
} 


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