category with name '0' gets ignored

[noonoo]

I have a category called 0 (zero) for all posts starting with 0, <?php single_cat_title(); ?> doesnt show 0 when inside that category, it works fine for all the other numbered categorys and all individual lettered categorys also work fine its just 0 thats giving me problems.

If i add something before or after the 0 it will then show but shouldnt it work ok with just 0?

Thanks in advance

[Viper007Bond]

The problem comes from the usage of if ( !empty($variable) ).

And actually there's two problems going on here. Viewing the archive for a category with the stub of 0 doesn't load the archive.php template -- it uses index.php. I've made a separate ticket for that though: #9352

[Viper007Bond]

Simple but effective workaround

[Denis-de-Bernardy]

On a more general note, why in the bloody hell is empty() used throughout WP.

I did a few tests on my end while wondering whether empty() or casting to boolean works fastest, and the latter beats the former by a landslide.

if ( !empty($foo) )
  ...

is slower than:

if ( !$foo )
  ...

[ryan]

Because empty() will avoid not set warnings, I reckon.

[mrmist]

Yep, the !empty avoids the PHP Notice: Undefined variable: foo

Back to the original patch - the change doesn't work for me. But then on IIS the

index.php/category/0/

Displays just like the front page, its almost as if the cat is not redirected at all, so the fact that the category name isn't displayed is the least of the issue.

Removing dev-feedback since Ryan replied.

[simonwheatley]

Changed keyword from needs-patch to has-patch. Did not test patch.

[Denis-de-Bernardy]

patch is no good. as highlighted by mist, the real issue is that such a category gets ignored entirely by WP, due to the fact that, well... empty('0') returns true.

wontfix imo

[Denis-de-Bernardy]

See also #7507

[Denis-de-Bernardy]

and #9352

[Denis-de-Bernardy]

moving to 2.9, from lack of valid patch

[hakre]

-1My Opinion: You will never get this patched. There are way tooo much IFs verywhere that check for false or empty and this category name. I just would comment "forget it".

[Denis-de-Bernardy]

let's close this, then.