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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 |
|---|---|
| 2375 | |
| 2376 | $orderby = $q['orderby']; |
| 2377 | |
| 2378 | // Apply post-paging filters on where and join. Only plugins that |
| 2379 | // manipulate paging queries should use these hooks. |
| 2380 | if ( !$q['suppress_filters'] ) { |
| 2381 | $where = apply_filters_ref_array( 'posts_where_paged', array( $where, &$this ) ); |
| 2382 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 2383 | $join = apply_filters_ref_array( 'posts_join_paged', array( $join, &$this ) ); |
| 2384 | $orderby = apply_filters_ref_array( 'posts_orderby', array( $orderby, &$this ) ); |
| 2385 | $distinct = apply_filters_ref_array( 'posts_distinct', array( $distinct, &$this ) ); |
| 2386 | $limits = apply_filters_ref_array( 'post_limits', array( $limits, &$this ) ); |
| 2387 | $fields = apply_filters_ref_array( 'posts_fields', array( $fields, &$this ) ); |
| 2388 | } |
| 2389 | |
| 2390 | // Announce current selection parameters. For use by caching plugins. |
| 2391 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 2392 | |
| 2393 | // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above. |