使用mod_rewrite模式匹配errorDocument规则

Question

Having a little difficulty implementing error handling for 404 to my site. Normally this is not an issue but in this case the set up is different.

I am having to use pattern matches in my .htaccess file for URL rewrites i.e. RewriteRule ^([^/]+)\/$ and RewriteRule ^products\/([^/]+)\/([^/]+)\/$ this is due to the site having a CMS controlled by other users who can add new pages I.e. www.yourdomain.com/pagename "pagename" being any new page.

Any URL typed in lets say "/about" will match RewriteRule ^([^/]+)\/$ then be checked in a database to find a match, if a match is found then the user is redirected to the correct page, if no match then I could redirect the user to a specific page or set a http status code.

Only problem with that is I would want to preserve the incorrect URL and a PHP redirect would overwite that.

code:

ErrorDocument 403           /errors.php?error=403
ErrorDocument 404           /errors.php?error=404
ErrorDocument 500           /errors.php?error=500
ErrorDocument 503           /errors.php?error=503

RewriteEngine                                  On

RewriteRule ^([^/]+)\/$                     ?cat=generic&page=$1 [L]
RewriteRule ^products\/([^/]+)\/([^/]+)\/$  ?cat=product&page=$2 [L]

Now I am pretty sure the issue is due to having the rewrite rules I have in place, so what I suppose I am looking for is an alternative to the rewrites that still allow me to grab any newly created page url but also allows for successful error document handling.

If I have left out any vital code/information please let me know and I shall edit the post with it.

Thank you in advance for any advice/help.

EDIT::

PHP script that handles the page content.

function page_handler() {
    if(!isset($_GET['cat'])):
        $_GET['cat'] = 'generic';
        $_GET['page'] = 'home';
    endif;

    // Connect to the database
    $link = db_connect_cms();

    // Grab the id of the page
    $qry = mysqli_query($link,"
        SELECT hash,slug
        FROM cms_web_pages
        WHERE slug='".$_GET['page']."'
        AND published=1")

        or die(mysqli_error($link)
    );

    $row = mysqli_fetch_object($qry);

    // If there is a match in the db
    if(mysqli_num_rows($qry) > 0):
        $id_hash = $row->hash;
    else:
        $_GET["error"] = "404";
        require_once($_SERVER["DOCUMENT_ROOT"] . "/errors.php");
    endif;

    return array($id_hash);
}

Answer 1

You can achieve that by replacing this line in your PHP code:

header("location: /errors.php?error=404");

with this:

// have this code when DB lookup fails
$_GET["error"] = "404";
include($_SERVER["DOCUMENT_ROOT"] . "/errors.php");
exit; // required to prevent showing current page after error document