apply_filters( ‘get_the_categories’, WP_Term[] $categories, int|false $post_id )

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   Sumit Singh 10 years ago

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   Remove certain categories from being display on post loop for a specific post.

   Assume we want to remove categories with slug cat-slug-a and cat-slug-b for post with ID 5

   /**
    * Remove certain categories on post loop for a specific post
    * @param array $categories Array of categories
    * @return array $categories filtred categories
    */
   function wpdocs_remove_selected_categories( $categories ) {
   	if ( 5 == get_the_ID() ) { // Check if it is a specific post.
   		
   		$categories_to_remove = array(
   			'cat-slug-a',
   			'cat-slug-b'
   		); // Array of categories slug to be remove.
   
   		foreach ( $categories as $index => $single_cat ) {
   
   			if ( in_array( $single_cat->slug, $categories_to_remove ) ) {
   				unset( $categories[ $index ] ); // Remove the category.
   			}
   		}
   	}
   	
   	return $categories;
   }
   add_filter( 'get_the_categories', 'wpdocs_remove_selected_categories' );