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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 |
|---|---|
| 2508 | |
| 2509 | /** |
| 2510 | * Filters the GROUP BY clause of the query. |
| 2511 | * |
| 2512 | * @since 2.0.0 |
| 2513 | * |
| 2514 | * @param string $groupby The GROUP BY clause of the query. |
| 2515 | * @param WP_Query $this The WP_Query instance (passed by reference). |
| 2516 | */ |
| 2517 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 2518 | |
| 2519 | /** |
| 2520 | * Filters the JOIN clause of the query. |
| 2521 | * |
| 2522 | * Specifically for manipulating paging queries. |
| 2523 | * |
| 2524 | * @since 1.5.0 |
| 2525 | * |
| 2526 | * @param string $join The JOIN clause of the query. |