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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 |
|---|---|
| 3332 | |
| 3333 | /** |
| 3334 | * Filters the GROUP BY clause of the query. |
| 3335 | * |
| 3336 | * @since 2.0.0 |
| 3337 | * |
| 3338 | * @param string $groupby The GROUP BY clause of the query. |
| 3339 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3340 | */ |
| 3341 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 3342 | |
| 3343 | /** |
| 3344 | * Filters the JOIN clause of the query. |
| 3345 | * |
| 3346 | * Specifically for manipulating paging queries. |
| 3347 | * |
| 3348 | * @since 1.5.0 |
| 3349 | * |
| 3350 | * @param string $join The JOIN clause of the query. |