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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 |
|---|---|
| 3031 | /** |
| 3032 | * Fires to announce the query's current selection parameters. |
| 3033 | * |
| 3034 | * For use by caching plugins. |
| 3035 | * |
| 3036 | * @since 2.3.0 |
| 3037 | * |
| 3038 | * @param string $selection The assembled selection query. |
| 3039 | */ |
| 3040 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 3041 | |
| 3042 | /* |
| 3043 | * Filters again for the benefit of caching plugins. |
| 3044 | * Regular plugins should use the hooks above. |
| 3045 | */ |
| 3046 | if ( ! $query_vars['suppress_filters'] ) { |
| 3047 | /** |
| 3048 | * Filters the WHERE clause of the query. |
| 3049 | * |