WordPress MU

Is there a way to fix the problem still showing as donncha mentioned when $_SERVER['PHP_SELF'] is blank?

I'm having this problem too. To get the admin interface to work I deleted the contents of the .htaccess file. This got all the admin settings to work so I can create a a blog, write the first entry, create new users etc.

However when I try to go to the new blogs I get the 404 error.

ckennard - It sounds like you have a different problem. This thread is about 404 is not showing when it should.

Okay, I'll start a new thread.

I looked at what donncha said earlier here. Actually my $PHP_SELF is not empty but I am still seeing this behavior on the latest version that the 404 page and header is not showing up on a nonexisting post on the sub-blogs of an installation that uses subdirectories.

He said it's fixed but I don't see that it's fixed. Anybody... help?

Okay, I looked into the WPMU code and this is what I see causing the 404 not happening on all blogs except the main blog on WPMU installed using subdirectories instead of subdomains.

In wp-settings.php,

// Fix empty PHP_SELF
$PHP_SELF = $_SERVER['PHP_SELF'];
if ( empty($PHP_SELF) ||
    ( constant( 'VHOST' ) == 'no' &&
      $current_blog->path != '/' ) )
  $_SERVER['PHP_SELF'] = $PHP_SELF =
    preg_replace("/(\?.*)?$/",'',$_SERVER["REQUEST_URI"]);

the second OR condition always evaluates to true for all blogs except the main blog on WPMU installed with subdirectories. So PHP_SELF is always replaced with the REQUEST_URI.

What happens is:

Main blog non-existing post

REQUEST_URI is "blog/non-existing-post"
PHP_SELF is and remains "/index.php"

Sub-blog non-existing post

REQUEST_URI is "subblog/non-existing-post"
PHP_SELF gets changed from "/index.php" to "subblog/non-existing-post"

Then, as flywitness posted earlier in this post, PHP_SELF and REQUEST_URI being the same prevents the 404 from happening properly.

In wp-includes/classes.php,

in class WP, $req_uri and $self end up the same so this:

if (empty($request) || $req_uri == $self || strpos($_SERVER['PHP_SELF'], 'wp-admin/') !== false)

runs this:

$this->did_permalink = false;

which means that in function handle_404, this:

if ( (0 == count($wp_query->posts)) && !is_404() && !is_search() && ( $this->did_permalink || (!empty($_SERVER['QUERY_STRING']) && (false === strpos($_SERVER['REQUEST_URI'], '?'))) ) )

returns false which prevents this:

$wp_query->set_404();

from happening.

I'm not understanding why PHP_SELF is changed from /index.php to the REQUEST_URI on sub-blogs in subdirectory installations.

Help, anyone? I've been talking to myself for some time.

Merry Christmas.

So far, the (quick-n-dirty) solution I found is to move one step back:

wp-settings.php (line 239)

- if ( empty($PHP_SELF) || ( constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )
+ if ( empty($PHP_SELF) )

This could probably brings old problems back but so far I haven't seen any.

tomgf - That is what I did too. I'm not sure what the old problems were that led to the change in the first place. I haven't had any problems so far using this reverting hack.

@tomgf your fix solved my problems which nuts me the past three days, thnx alot!

Any idea for a more consistent fix? After the last upgrade this hack was obviously gone…

By the way, on wpmu-2.7 the proposed hack is on a different line:

wp-settings.php (line 270)

- if ( empty($PHP_SELF) || ( constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )
+ if ( empty($PHP_SELF) )

I am seeing this problem too. @tomgf, your fix solved the problem for me on 2.7. However, I am not sure if it will cause any additional problems?

I get the same problem with WPMU 2.7.1

I submitted the the bug:
http://trac.mu.wordpress.org/ticket/995

On the ticket page donncha says that this quick'n dirty solution breaks things for sub-domain installs.

I proposed there a different one (will it cut it for v. 2.8?):
wp-settings.php (line 281)

- if ( empty($PHP_SELF) || ( constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )
+ if ( empty($PHP_SELF) || ( empty($PHP_SELF) && constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )
	$_SERVER['PHP_SELF'] = $PHP_SELF = preg_replace("/(\?.*)?$/",'',$_SERVER["REQUEST_URI"]);

Having the same problem using WordPress MU 2.8.1

Added

ErrorDocument 404 /index.php?error=404

to the .htaccess file to fix my problem.

The solution I have proposed it should be done on line 315 for WordPress µ 2.8.2:

wp-settings (line 315)

- if ( empty($PHP_SELF) || ( constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )
+ if ( empty($PHP_SELF) || ( empty($PHP_SELF) && constant( 'VHOST' ) == 'no' && $current_blog->path != '/' ) )