How to make a 404 redirect when routing?

Question

PHP

Not so long ago, Toaster suggested me a very cool topic with routing and php, thank you very much:3
And now, when I almost rewrote my "engine", I had a question about 404 redirects.
I tried to do this:
First, if the url does not fit any rules, the router thinks that this is an article (because the article can be anywhere).

else {
        $this -> set('ContentManager', new ArticleManager($address, $this['database']));
        $route_to = 'article';
}

The article itself checks its URL against the database, if it doesn’t find anything there, it redirects to the page with 404.

if (count($this -> mysql_content) == 0) {
        header( "Location: /error404.php", true, 404 );
        exit();
}

When my page started redirecting to 404s, I was initially delighted. "Just write in .htaccess, and you're done!".

ErrorDocument 404 http://klimatdomu.ru/error404.php

RewriteEngine on

RewriteCond %{HTTP_HOST} ^www.klimatdomu.ru$ [NC]
RewriteRule ^(.*)$ http://klimatdomu.ru/$1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

RewriteRule ^(.*)$ index.php?route=$1 [L,QSA]

But for some reason this thing does not work, the site still hangs on 404

I would be grateful if someone points out where I went wrong, and how can I implement this? Page with 404 - error404.php
Thanks in advance.

Answer 1

header( "Location: /error404.php", true, 404);
The browser is getting a 404 response and is most likely not executing "Location: /error404.php" because of this.
Try this
header("Location: /error404.php", true);