我不知道是什么is_category_or_sub()
该函数是关键的代码。如果没有它,你的代码为什么不能工作的问题是无法回答的,但是there is code in the Codex 这似乎可以满足您的需要:
/**
* Tests if any of a post\'s assigned categories are descendants of target categories
*
* @param int|array $cats The target categories. Integer ID or array of integer IDs
* @param int|object $_post The post. Omit to test the current post in the Loop or main query
* @return bool True if at least 1 of the post\'s categories is a descendant of any of the target categories
* @see get_term_by() You can get a category by name or slug, then pass ID to this function
* @uses get_term_children() Passes $cats
* @uses in_category() Passes $_post (can be empty)
* @version 2.7
* @link http://codex.wordpress.org/Function_Reference/in_category#Testing_if_a_post_is_in_a_descendant_category
*/
if ( ! function_exists( \'post_is_in_descendant_category\' ) ) {
function post_is_in_descendant_category( $cats, $_post = null ) {
foreach ( (array) $cats as $cat ) {
// get_term_children() accepts integer ID only
$descendants = get_term_children( (int) $cat, \'category\' );
if ( $descendants && in_category( $descendants, $_post ) )
return true;
}
return false;
}
}
还有。。。
if ( in_category( 210 ) || post_is_in_descendant_category( 210 ) ) {
// In the category
} else {
// not in the category
}