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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
2563           // Apply post-paging filters on where and join. Only plugins that
2564           // manipulate paging queries should use these hooks.
2565           if ( !$q['suppress_filters'] ) {
2566                $where          = apply_filters_ref_array( 'posts_where_paged',     array( $where, &$this ) );
2567                $groupby     = apply_filters_ref_array( 'posts_groupby',          array( $groupby, &$this ) );
2568                $join          = apply_filters_ref_array( 'posts_join_paged',     array( $join, &$this ) );
2569                $orderby     = apply_filters_ref_array( 'posts_orderby',          array( $orderby, &$this ) );
2570                $distinct     = apply_filters_ref_array( 'posts_distinct',     array( $distinct, &$this ) );
2571                $limits          = apply_filters_ref_array( 'post_limits',          array( $limits, &$this ) );
2572                $fields          = apply_filters_ref_array( 'posts_fields',          array( $fields, &$this ) );
2573
2574                // Filter all clauses at once, for convenience
2575                $clauses = (array) apply_filters_ref_array( 'posts_clauses', array( compact( $pieces ), &$this ) );
2576                foreach ( $pieces as $piece )
2577                     $$piece = isset( $clauses[ $piece ] ) ? $clauses[ $piece ] : '';
2578           }
2579
2580           // Announce current selection parameters. For use by caching plugins.
2581           do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join );