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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 |
|---|---|
| 1428 | // Announce current selection parameters. For use by caching plugins. |
| 1429 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 1430 | |
| 1431 | // Filter again for the benefit of caching plugins. Regular plugins should use the hooks above. |
| 1432 | $where = apply_filters('posts_where_request', $where); |
| 1433 | $groupby = apply_filters('posts_groupby_request', $groupby); |
| 1434 | $join = apply_filters('posts_join_request', $join); |
| 1435 | $orderby = apply_filters('posts_orderby_request', $orderby); |
| 1436 | $distinct = apply_filters('posts_distinct_request', $distinct); |
| 1437 | $fields = apply_filters('posts_fields_request', $fields); |
| 1438 | $limits = apply_filters( 'post_limits_request', $limits ); |
| 1439 | |
| 1440 | if ( ! empty($groupby) ) |
| 1441 | $groupby = 'GROUP BY ' . $groupby; |
| 1442 | if ( !empty( $orderby ) ) |
| 1443 | $orderby = 'ORDER BY ' . $orderby; |
| 1444 | $found_rows = ''; |
| 1445 | if ( !empty($limits) ) |
| 1446 | $found_rows = 'SQL_CALC_FOUND_ROWS'; |