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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 |
|---|---|
| 2785 | if ( !empty( $this->meta_query->queries ) ) { |
| 2786 | $clauses = $this->meta_query->get_sql( 'post', $wpdb->posts, 'ID', $this ); |
| 2787 | $join .= $clauses['join']; |
| 2788 | $where .= $clauses['where']; |
| 2789 | } |
| 2790 | |
| 2791 | // Apply filters on where and join prior to paging so that any |
| 2792 | // manipulations to them are reflected in the paging by day queries. |
| 2793 | if ( !$q['suppress_filters'] ) { |
| 2794 | $where = apply_filters_ref_array('posts_where', array( $where, &$this ) ); |
| 2795 | $join = apply_filters_ref_array('posts_join', array( $join, &$this ) ); |
| 2796 | } |
| 2797 | |
| 2798 | // Paging |
| 2799 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
| 2800 | $page = absint($q['paged']); |
| 2801 | if ( !$page ) |
| 2802 | $page = 1; |
| 2803 | |