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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )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.
| Line | Code |
|---|---|
| 1392 | } |
| 1393 | |
| 1394 | // Apply post-paging filters on where and join. Only plugins that |
| 1395 | // manipulate paging queries should use these hooks. |
| 1396 | |
| 1397 | $where = apply_filters('posts_where_paged', $where); |
| 1398 | $groupby = apply_filters('posts_groupby', $groupby); |
| 1399 | $join = apply_filters('posts_join_paged', $join); |
| 1400 | $orderby = apply_filters('posts_orderby', $q['orderby']); |
| 1401 | $distinct = apply_filters('posts_distinct', $distinct); |
| 1402 | $fields = apply_filters('posts_fields', "$wpdb->posts.*"); |
| 1403 | $limits = apply_filters( 'post_limits', $limits ); |
| 1404 | |
| 1405 | // Announce current selection parameters. For use by caching plugins. |
| 1406 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 1407 | |
| 1408 | // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above. |
| 1409 | $where = apply_filters('posts_where_request', $where); |
| 1410 | $groupby = apply_filters('posts_groupby_request', $groupby); |