function __add_global_categories( $term_id ) { if ( get_current_blog_id() !== BLOG_ID_CURRENT_SITE || ( !$term = get_term( $term_id, ‘category’ ) ) ) return $term_id; // bail if ( !$term->parent || ( !$parent = get_term( $term->parent, ‘category’ ) ) ) $parent = null; global $wpdb; $blogs = $wpdb->get_col( “SELECT blog_id FROM {$wpdb->blogs} WHERE site_id = ‘{$wpdb->siteid}'” ); foreach … Read more
There is a sad truth: you can never ever be sure that some code will not break your code, and there is nothing you can do to prevent that. Especially in WordPress, where everything is global. That said, yes, global $post is one of the most used global var, so using special care for it … Read more
Or, if you’re lazy, just install the Debug Bar plugin. It adds a button to the admin bar that, when clicked, reveals a panel with all kinds of useful information, including deprecation notices, WP_Query variables and an SQL query log.
While I strongly advise against this, and it will not speed things up, your usage is incorrect. WordPress already caches these things in the object cache/memory so it doesn’t have to fetch it multiple times in the same request, you don’t need to store the result and reuse, WP does that already out of the … Read more