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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 |
|---|---|
| 1355 | if ( ! empty($q['meta_key']) || ! empty($q['meta_value']) ) |
| 1356 | $join .= " LEFT JOIN $wpdb->postmeta ON ($wpdb->posts.ID = $wpdb->postmeta.post_id) "; |
| 1357 | if ( ! empty($q['meta_key']) ) |
| 1358 | $where .= $wpdb->prepare("AND $wpdb->postmeta.meta_key = %s ", $q['meta_key']); |
| 1359 | if ( ! empty($q['meta_value']) ) |
| 1360 | $where .= $wpdb->prepare("AND $wpdb->postmeta.meta_value = %s ", $q['meta_value']); |
| 1361 | |
| 1362 | // Apply filters on where and join prior to paging so that any |
| 1363 | // manipulations to them are reflected in the paging by day queries. |
| 1364 | $where = apply_filters('posts_where', $where); |
| 1365 | $join = apply_filters('posts_join', $join); |
| 1366 | |
| 1367 | // Paging |
| 1368 | if ( empty($q['nopaging']) && !$this->is_singular ) { |
| 1369 | $page = absint($q['paged']); |
| 1370 | if (empty($page)) { |
| 1371 | $page = 1; |
| 1372 | } |
| 1373 | |