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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 |
|---|---|
| 3289 | * Filter the GROUP BY clause of the query. |
| 3290 | * |
| 3291 | * For use by caching plugins. |
| 3292 | * |
| 3293 | * @since 2.5.0 |
| 3294 | * |
| 3295 | * @param string $groupby The GROUP BY clause of the query. |
| 3296 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3297 | */ |
| 3298 | $groupby = apply_filters_ref_array( 'posts_groupby_request', array( $groupby, &$this ) ); |
| 3299 | |
| 3300 | /** |
| 3301 | * Filter the JOIN clause of the query. |
| 3302 | * |
| 3303 | * For use by caching plugins. |
| 3304 | * |
| 3305 | * @since 2.5.0 |
| 3306 | * |
| 3307 | * @param string $join The JOIN clause of the query. |