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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 |
|---|---|
| 2514 | if ( !empty( $this->meta_query->queries ) ) { |
| 2515 | $clauses = $this->meta_query->get_sql( 'post', $wpdb->posts, 'ID', $this ); |
| 2516 | $join .= $clauses['join']; |
| 2517 | $where .= $clauses['where']; |
| 2518 | } |
| 2519 | |
| 2520 | // Apply filters on where and join prior to paging so that any |
| 2521 | // manipulations to them are reflected in the paging by day queries. |
| 2522 | if ( !$q['suppress_filters'] ) { |
| 2523 | $where = apply_filters_ref_array('posts_where', array( $where, &$this ) ); |
| 2524 | $join = apply_filters_ref_array('posts_join', array( $join, &$this ) ); |
| 2525 | } |
| 2526 | |
| 2527 | // Paging |
| 2528 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
| 2529 | $page = absint($q['paged']); |
| 2530 | if ( !$page ) |
| 2531 | $page = 1; |
| 2532 | |