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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 |
|---|---|
| 3175 | |
| 3176 | /** |
| 3177 | * Filter the GROUP BY clause of the query. |
| 3178 | * |
| 3179 | * @since 2.0.0 |
| 3180 | * |
| 3181 | * @param string $groupby The GROUP BY clause of the query. |
| 3182 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 3183 | */ |
| 3184 | $groupby = apply_filters_ref_array( 'posts_groupby', array( $groupby, &$this ) ); |
| 3185 | |
| 3186 | /** |
| 3187 | * Filter the JOIN clause of the query. |
| 3188 | * |
| 3189 | * Specifically for manipulating paging queries. |
| 3190 | * |
| 3191 | * @since 1.5.0 |
| 3192 | * |
| 3193 | * @param string $join The JOIN clause of the query. |