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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 |
|---|---|
| 3439 | * Filter the GROUP BY clause of the query. |
| 3440 | * |
| 3441 | * For use by caching plugins. |
| 3442 | * |
| 3443 | * @since 2.5.0 |
| 3444 | * |
| 3445 | * @param string $groupby The GROUP BY clause of the query. |
| 3446 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3447 | */ |
| 3448 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 3449 | |
| 3450 | /** |
| 3451 | * Filter the JOIN clause of the query. |
| 3452 | * |
| 3453 | * For use by caching plugins. |
| 3454 | * |
| 3455 | * @since 2.5.0 |
| 3456 | * |
| 3457 | * @param string $join The JOIN clause of the query. |