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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 |
|---|---|
| 2831 | * Filters the JOIN clause of the query. |
| 2832 | * |
| 2833 | * For use by caching plugins. |
| 2834 | * |
| 2835 | * @since 2.5.0 |
| 2836 | * |
| 2837 | * @param string $join The JOIN clause of the query. |
| 2838 | * @param WP_Query $query The WP_Query instance (passed by reference). |
| 2839 | */ |
| 2840 | $join = apply_filters_ref_array( 'posts_join_request', array( $join, &$this ) ); |
| 2841 | |
| 2842 | /** |
| 2843 | * Filters the ORDER BY clause of the query. |
| 2844 | * |
| 2845 | * For use by caching plugins. |
| 2846 | * |
| 2847 | * @since 2.5.0 |
| 2848 | * |
| 2849 | * @param string $orderby The ORDER BY clause of the query. |