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Source View: posts_fields

To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).

Understanding Source Code

The best way to understand what a hook does is to look at where it occurs in the source code.

  • Action hooks look like this: do_action( "hook_name" )
  • Filter hooks look like this: apply_filters( "hook_name", "what_to_filter" ).

Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.

Source View

Line Code
2211                $groupby = apply_filters('posts_groupby', $groupby);
2212                $join = apply_filters('posts_join_paged', $join);
2213                $orderby = apply_filters('posts_orderby', $orderby);
2214                $distinct = apply_filters('posts_distinct', $distinct);
2215                $limits = apply_filters( 'post_limits', $limits );
2216
2217                if ( ! empty($q['meta_key']) )
2218                     $fields = "$fields, $wpdb->postmeta.meta_value";
2219
2220                $fields = apply_filters('posts_fields', $fields);
2221           }
2222
2223           // Announce current selection parameters.  For use by caching plugins.
2224           do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join );
2225
2226           // Filter again for the benefit of caching plugins.  Regular plugins should use the hooks above.
2227           if ( !$q['suppress_filters'] ) {
2228                $where = apply_filters('posts_where_request', $where);
2229                $groupby = apply_filters('posts_groupby_request', $groupby);