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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 |
|---|---|
| 2442 | if ( !empty( $q['meta_query'] ) ) { |
| 2443 | $clauses = call_user_func_array( '_get_meta_sql', array( $q['meta_query'], 'post', $wpdb->posts, 'ID', &$this) ); |
| 2444 | $join .= $clauses['join']; |
| 2445 | $where .= $clauses['where']; |
| 2446 | } |
| 2447 | |
| 2448 | // Apply filters on where and join prior to paging so that any |
| 2449 | // manipulations to them are reflected in the paging by day queries. |
| 2450 | if ( !$q['suppress_filters'] ) { |
| 2451 | $where = apply_filters_ref_array('posts_where', array( $where, &$this ) ); |
| 2452 | $join = apply_filters_ref_array('posts_join', array( $join, &$this ) ); |
| 2453 | } |
| 2454 | |
| 2455 | // Paging |
| 2456 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
| 2457 | $page = absint($q['paged']); |
| 2458 | if ( empty($page) ) |
| 2459 | $page = 1; |
| 2460 | |