PHP or htaccess make dynamic url page to go 404 when item is missing in DB
Typi开发者_JAVA百科cal scenario:
- DB items are displaied in page
http://...?item_id=467
- User one day deletes the item
- Google or a user
attempts to access
http://...?item_id=467
- PHP diggs into DB and sees items does not exist anymore, so now PHP must tell Google/user that item is not existing via a 404 header and page.
According to this answer I undertstood there is no way to redirect to 404 Apache page via PHP unless sending in code the 404 header + reading and sending down to client all the contents of your default 404 page.
The probelm: I already have an Apache parsed custom 404.shtml page, so obvioulsy I would like to simply use that page. But if i read an shtml page via PHP it won't be parsed by Apache anymore.
So what do you suggest me to do?
Is there maybe some trick I could use palying with htaccess too?
Thanks,
Hmm. Two ideas come to mind:
Redirect to the 404 page using
header("Location:...")
- this is not standards-compliant behaviour though. I would use that only as a last strawFetch and output the Apache-parsed SHTML file using
file_get_contents("http://mydomain.com/404.shtml");
- also not really optimal because a request is made to the web server but, I think, acceptable in most cases.
I doubt there is anything you can do in .htaccess
because the PHP script runs after any rewrite rules have already been parsed.
IF you are using apache mod_php, use virtual('/404.shtml');
to display the parsed shtml page to your user.
I was trying to do this exact same thing yesterday.
Does Pekka's file_get_contents/include result in a 404 status header being sent? Perhaps you need to do this before including the custom error page?
header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found");
You can test using this Firefox extension.
I was looking exactly for something like you needed, so you have a page:
http://example.com/page?item_id=456
and if later you want that if item is missing you are redirected to:
http://example.com/page_not_found?item_id=456
In reality I found it is much more maintainable solution to just use the original page as 404 page.
<?php
$item = findItem( $_GET['item_id']);
if($item === false){
//show 404 page sending correct header and then include 404 message
header( $_ENV['SERVER_PROTOCOL'].' 404 Not Found', true );
// you can still use $_GET['item_id'] to customize error message
// "maybe you were looking for XXX item"
include('somepath/missingpage.php');
return;
}
//continue as usual with normal page
?>
So if item is no longer in the DB, the 404 page is showed but you can provide custom items in replace or error messages.
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