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To save our bandwidth, we show only a snippet of code around each occurence of the hook. View complete file in SVN (without highlighting).
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 |
|---|---|
| 3410 | /** |
| 3411 | * Fires to announce the query's current selection parameters. |
| 3412 | * |
| 3413 | * For use by caching plugins. |
| 3414 | * |
| 3415 | * @since 2.3.0 |
| 3416 | * |
| 3417 | * @param string $selection The assembled selection query. |
| 3418 | */ |
| 3419 | do_action( 'posts_selection', $where . $groupby . $orderby . $limits . $join ); |
| 3420 | |
| 3421 | /* |
| 3422 | * Filter again for the benefit of caching plugins. |
| 3423 | * Regular plugins should use the hooks above. |
| 3424 | */ |
| 3425 | if ( !$q['suppress_filters'] ) { |
| 3426 | /** |
| 3427 | * Filter the WHERE clause of the query. |
| 3428 | * |