WordPress检查帖子是否在类别中，然后执行此操作…使用自定义类别

Question

Ok im not sure if I have worded the title right but basically I have posts in custom categories and I want to get the current post category and do something.

So for example: if current post is in tag_id 15, say 'your in the category vegetarian'

this is what im using:

http://www.example.com/wp-admin/edit-tags.php?action=edit&taxonomy=food_category&tag_ID=15&post_type=vegetarian

any help would be great, thank you

Answer 1

WordPress has a built in function for this: in_category( $category, $_post ) (used inside the loop):

<?php if( in_category( 'vegetarian' ) ): ?>
   You're in the vegetarian category
<?php endif; ?>

That's good for a specific use case. If you always want it to spit out your "You're in the [category] category" for every category, including future ones, you would use get_the_category( $id ) like this example (inside the loop).

<?php
$categories = get_the_category( $id );
if( $categories ){
  // Assumes you just want the first category
  print 'You&#8217;re in the ' . $categories[ 0 ]->name . ' category';
}
?>