in_category() returns true in Home page on local install

[Marventus]

Hello, guys. I've been scratching my head on this one for a few hours.
If you run the attached script on a live site, nothing gets echoed on the home page of a live WP installation. However, if you run it locally, the opposite occurs.

I'm running WP locally on XAMPP 1.7.7 with the following config:

+ Apache 2.2.21
+ MySQL 5.5.16 (Community Server)
+ PHP 5.3.8 (VC9 X86 32bit thread safe) + PEAR
+ XAMPP Control Panel Version 2.5 from www.nat32.com
+ (BETA) XAMPP Control Panel Version 3.0.2 by Steffen Strueber (not in the USB & lite version)
+ XAMPP Security
+ OpenSSL 1.0.0e
+ phpMyAdmin 3.4.5

[Marventus]

Short Testing plugin

[helen]

I think this belongs on the support forums: ​https://wordpress.org/support/

That said, I suspect your posts are not the same between environments - in_category() applies to a specific post, and shouldn't be used in wp_head without checking if you're looking at a singular item or else you might get unpredictable results.

[Marventus]

Replying to helen:
Hi, Helen. Thanks for pitching in.

That said, I suspect your posts are not the same between environments

Nope, they are actually. Dbs are the same (local is a dump from live with different site and home urls)

• in_category() applies to a specific post, and shouldn't be used in wp_head without checking if you're looking at a singular item or else you might get unpredictable results.

I agree with you. I stumbled upon this by accident while trying something else, and wrote that little plugin for testing purposes only.
However, the function should return the same output regardless of the environment WP is running on, right?

[helen]

Maybe, if all else is the same. Can't reproduce, though.

[Marventus]

Don't worry about it: it's one in a million. Let's leave it closed for now and if I have more info I'll post it here.
Thanks for your help!

[SergeyBiryukov]

Replying to Marventus:

Replying to helen:

That said, I suspect your posts are not the same between environments

Nope, they are actually. Dbs are the same (local is a dump from live with different site and home urls)

You can modify your function to confirm that:

function tgitest_in_category() {
	echo '<pre>'; print_r( get_post() ); echo '</pre>';

	if ( in_category( 'reviews' ) )
		echo 'This is a test for admins only. Please disregard.';
}
add_action( 'wp_head', 'tgitest_in_category' );