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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 1066 | |
| 1067 | $defaults = array('child_of' => 0, 'sort_order' => 'ASC', 'sort_column' => 'post_title', |
| 1068 | 'hierarchical' => 1, 'exclude' => '', 'include' => '', 'meta_key' => '', 'meta_value' => '', 'authors' => ''); |
| 1069 | $r = array_merge($defaults, $r); |
| 1070 | extract($r); |
| 1071 | |
| 1072 | $key = md5( serialize( $r ) ); |
| 1073 | if ( $cache = wp_cache_get( 'get_pages', 'page' ) ) |
| 1074 | if ( isset( $cache[ $key ] ) ) |
| 1075 | return apply_filters('get_pages', $cache[ $key ], $r ); |
| 1076 | |
| 1077 | $inclusions = ''; |
| 1078 | if ( !empty($include) ) { |
| 1079 | $child_of = 0; //ignore child_of, exclude, meta_key, and meta_value params if using include |
| 1080 | $exclude = ''; |
| 1081 | $meta_key = ''; |
| 1082 | $meta_value = ''; |
| 1083 | $incpages = preg_split('/[\s,]+/',$include); |
| 1084 | if ( count($incpages) ) { |
| Line | Code |
| 1136 | |
| 1137 | $query = "SELECT * FROM $wpdb->posts " ; |
| 1138 | $query .= ( empty( $meta_key ) ? "" : ", $wpdb->postmeta " ) ; |
| 1139 | $query .= " WHERE (post_type = 'page' AND post_status = 'publish') $exclusions $inclusions " ; |
| 1140 | $query .= ( empty( $meta_key ) | empty($meta_value) ? "" : " AND ($wpdb->posts.ID = $wpdb->postmeta.post_id AND $wpdb->postmeta.meta_key = '$meta_key' AND $wpdb->postmeta.meta_value = '$meta_value' )" ) ; |
| 1141 | $query .= $author_query; |
| 1142 | $query .= " ORDER BY " . $sort_column . " " . $sort_order ; |
| 1143 | |
| 1144 | $pages = $wpdb->get_results($query); |
| 1145 | $pages = apply_filters('get_pages', $pages, $r); |
| 1146 | |
| 1147 | if ( empty($pages) ) |
| 1148 | return array(); |
| 1149 | |
| 1150 | // Update cache. |
| 1151 | update_page_cache($pages); |
| 1152 | |
| 1153 | if ( $child_of || $hierarchical ) |
| 1154 | $pages = & get_page_children($child_of, $pages); |