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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 |
---|---|
2870 | /** |
2871 | * Fires to announce the query's current selection parameters. |
2872 | * |
2873 | * For use by caching plugins. |
2874 | * |
2875 | * @since 2.3.0 |
2876 | * |
2877 | * @param string $selection The assembled selection query. |
2878 | */ |
2879 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
2880 |
|
2881 | /* |
2882 | * Filters again for the benefit of caching plugins. |
2883 | * Regular plugins should use the hooks above. |
2884 | */ |
2885 | if ( ! $q['suppress_filters'] ) { |
2886 | /** |
2887 | * Filters the WHERE clause of the query. |
2888 | * |