WordPress MU

I just installed a fresh copy of wpmu 2.7.1 and got the following errors on various pages:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /wp-includes/capabilities.php on line 539

Warning: Cannot modify header information - headers already sent by (output started at /wp-includes/capabilities.php:537) in /wp-includes/functions.php on line 689

Warning: Cannot modify header information - headers already sent by (output started at /wp-includes/capabilities.php:537) in /wp-includes/functions.php on line 690

First time I saw these errors was when trying to activate a user which I had created as "admin" in the backend. I think I added the new user to the list of SITE Admins which I guess might have caused confusions when activating...

Later I saw the same errors when adding the same user to a new blog using the "SiteAdmin > Blogs > Edit Blog" page... I was logged in as the new user at that time (does that matter?)

And another error which I don't remember which page it happened on:

Fatal error: Call to a member function has_cap() on a non-object in /wp-admin/users.php on line 59

I just upgraded my 2.7 install to 2.7.1 using the auto upgrade feature, and am getting similar errors:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /var/www/html/blogs/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /var/www/html/blogs/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /var/www/html/blogs/wp-includes/capabilities.php on line 539

I also just upgraded from 2.7 to 2.7.1 by downloading and replacing files and I an getting the same errors as alphawolf70 when I visit any of my root blog's admin pages.

I don't know if this is the best way to fix this bug, but I added this to line 537 of my capabilities.php file in wp-includes:

if ( is_array($role->capabilities) )

so that section looks like this:

if ( is_array($role->capabilities) )
	$this->allcaps = array_merge( $this->allcaps, $role->capabilities );

That made the warnings disappear for me. However, the source of the problem may lie somewhere else.

jlencion - that hides the problem but doesn't solve it. Can you add this code just before line 537? (before the foreach)
error_log( print_r( $role, 1 ) );
Check your PHP error log and paste the debug test to http://pastebin.com/ and link to it here please.

I got exactly this same error. But it's not happening just on one of my blog cars.apmart.com The rest seem to be fine.

Exact same 3 errors right on the homepage.

I checked the v2.7.0 capabilities.php file and locate line 537. Found the different and fixed it. As follow:


# Binh 2.7.1: $role =& $wp_roles->get_role( $role );
# Fix to:
$role = $wp_roles->get_role( $role );

believe me Donncha, the problem lies somewhere and that somewhere is exactly that & sign.

also getting this error.

binh, that's a bad fix. it would be more proper to force (array) type.

I'm getting the same error. It is really frustrating not to know what to do.

Does anyone know what is wrong here?

Did you try upgrading to 2.7.1?

andrea_r, this was caused by the upgrade to 2.7.1...

Ah, I think there was a trac ticket on it.

Go on, someone with that error - please try to debug it and find what role is missing it's capabilities and we'll fix it. See my instructions above wrt error_log()

Better still, document steps that will allow *anyone* to reproduce it.

How to reproduce:

1. Set a "non blog user" dashboard blog.
2. Create a user without a blog. (I created it through the signup form but I think you could probably do it from the backend too)
3. Login as that user. Everything's fine. Logout again.
4. Add that user as a site admin.
5. Login again. Check your php error log. Lots of errors.

Looks like the promote_if_siteadmin() function is causing this.

Commenting out calls to that function fixes this problem.

I added error_log( print_r( $role, 1 ) ); before the for each. I see two blank lines before the Warning: array_merge() in the error log

@donncha is commenting out calls to that function the resolution to this issue or just an indicator to a fix. Commenting out a call doesn't sound like a fix but then what do I know?!

I'm nailed as well and am having a mapping or crosslinking problem that might be related to this issue. Changing the permissions of a user results in this:

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 539

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 539

Warning: array_merge() [function.array-merge]: Argument #2 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 537

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in /home/mysite/public_html/wp-includes/capabilities.php on line 539

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/mysite/public_html/wp-includes/capabilities.php on line 641

Warning: array_reduce() [function.array-reduce]: The first argument should be an array in /home/mysite/public_html/wp-includes/capabilities.php on line 641

Warning: Cannot modify header information - headers already sent by (output started at /home/mysite/public_html/wp-includes/capabilities.php:537) in /home/mysite/public_html/wp-includes/pluggable.php on line 856

donncha :

foreach ( (array) $this->roles as $role ) {
  error_log( print_r( $role, 1 ) ) ;
  $role =& $wp_roles->get_role( $role );
  error_log( "After =& : ",print_r( $role, 1) ) ;
  $this->allcaps = array_merge( $this->allcaps, $role->capabilities );
}

Here is what appeared in my error_log after putting the debug lines into capabilities.php :

[Sun Apr 26 00:37:08 2009] [error] [client 000] administrator
[Sun Apr 26 00:37:08 2009] [error] [client 000] After =& :
[Sun Apr 26 00:37:08 2009] [error] [client 000] subscriber
[Sun Apr 26 00:37:08 2009] [error] [client 000] After =& :
[Sun Apr 26 00:37:08 2009] [error] [client 000] administrator
[Sun Apr 26 00:37:08 2009] [error] [client 000] After =& :
[Sun Apr 26 00:37:08 2009] [error] [client 000] subscriber
[Sun Apr 26 00:37:08 2009] [error] [client 000] After =& :

It looks like =& operator is destroying $role.

Yesterday Donncha put the following submission forward. Does it fix the problem?

http://trac.mu.wordpress.org/changeset/1764

Trent

Hmmm... this seemed to work for me. Thanks donncha!

Yes, adding 'return 'false;' stopped the error messages for me, too. Thank you.

Adding that "return false;" statement fixed this issue for me as well!

I came here to report the exact same problem. Adding the "return false;" fixed it for me too!

Thank you.

I'm running wp 2.7.1...so, were do I put the "return false" statement, ie., what php source file?

thanks

FYI,

forgot to mention in last post, I don't have or can't find the wpmu_functions.php mentioned in http://trac.mu.wordpress.org/changeset/1764...

That's why I need help...

thanks

wp-includes/wpmu-functions.php

You do have that file :-)

I think I found a typo in wpmu-functions.php. In function promote_if_site_admin the line:
$user->{$cap_key} = array_merge(array( 'administrator' => '1' ), (array)$user->{$cap_key});
should be:
$user->{$cap_key} = array_merge(array( 'Administrator' => '1' ), (array)$user->{$cap_key});
In other words, a capital A in administrator

Bluee,

Thanks for the fix, that worked great!

The fix is on line 1975 of wpmu-functions.php

The fix from Bluee worked for me too.