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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 |
|---|---|
| 2618 | /** |
| 2619 | * Fires to announce the query's current selection parameters. |
| 2620 | * |
| 2621 | * For use by caching plugins. |
| 2622 | * |
| 2623 | * @since 2.3.0 |
| 2624 | * |
| 2625 | * @param string $selection The assembled selection query. |
| 2626 | */ |
| 2627 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 2628 | |
| 2629 | /* |
| 2630 | * Filters again for the benefit of caching plugins. |
| 2631 | * Regular plugins should use the hooks above. |
| 2632 | */ |
| 2633 | if ( !$q['suppress_filters'] ) { |
| 2634 | /** |
| 2635 | * Filters the WHERE clause of the query. |
| 2636 | * |