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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 |
|---|---|
| 2854 | |
| 2855 | /** |
| 2856 | * Filter the JOIN clause of the query. |
| 2857 | * |
| 2858 | * @since 1.5.0 |
| 2859 | * |
| 2860 | * @param string $where The JOIN clause of the query. |
| 2861 | * @param WP_Query &$this The WP_Query instance (passed by reference). |
| 2862 | */ |
| 2863 | $join = apply_filters_ref_array( 'posts_join', array( $join, &$this ) ); |
| 2864 | } |
| 2865 | |
| 2866 | // Paging |
| 2867 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
| 2868 | $page = absint($q['paged']); |
| 2869 | if ( !$page ) |
| 2870 | $page = 1; |
| 2871 | |
| 2872 | if ( empty($q['offset']) ) { |