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1. c.e.macht
   Member
   Posted 1 year ago #

   I have created a hierarchical custom taxonomy 'page_category' (similar to post category) through my functions.php and would like to use conditional if-statements to display different images in my header.

   My problem is however, that I don't know how to access these new taxonomies. Apparently in_category() only works with the standard post category, I would probably need a new function like in_page_category(). How do I write this?

   A very similar problem has been discussed in this topic I believe though, that has_tags() will not be of help with my hierarchical taxonomies.

   Any help is greatly appreciated!

   // pointers on custom taxonomies from Justin Tadlock
   A refresher on custom taxonomies
   Custom Taxonomies in WP 2.8

2. c.e.macht
   Member
   Posted 1 year ago #

   So.. as always, the trick is to ask "Why does this work how it does?" and look up the root. In this case through cross-reference searching where in_category() is defined, copying that function to functions.php and replacing the standard $category with your custom $page-category.

   You'll find in_category in wp-includes/category-template.php, l. 237.

   /**
    * Check if the current post in within any of the given categories.
    *
    * The given categories are checked against the post's categories' term_ids, names and slugs.
    * Categories given as integers will only be checked against the post's categories' term_ids.
    *
    * Prior to v2.5 of WordPress, category names were not supported.
    * Prior to v2.7, category slugs were not supported.
    * Prior to v2.7, only one category could be compared: in_category( $single_category ).
    * Prior to v2.7, this function could only be used in the WordPress Loop.
    * As of 2.7, the function can be used anywhere if it is provided a post ID or post object.
    *
    * @since 1.2.0
    *
    * @uses is_object_in_term()
    *
    * @param int|string|array $category. Category ID, name or slug, or array of said.
    * @param int|post object Optional.  Post to check instead of the current post. @since 2.7.0
    * @return bool True if the current post is in any of the given categories.
    */
   function in_category( $category, $_post = null ) {
   	if ( empty( $category ) )
   		return false;
   
   	if ( $_post ) {
   		$_post = get_post( $_post );
   	} else {
   		$_post =& $GLOBALS['post'];
   	}
   
   	if ( !$_post )
   		return false;
   
   	$r = is_object_in_term( $_post->ID, 'category', $category );
   	if ( is_wp_error( $r ) )
   		return false;
   	return $r;
   }

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