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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 | * |