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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 3 times in this file.
| Line | Code |
|---|---|
| 2074 | 'authors' => '', 'parent' => -1, 'exclude_tree' => '' |
| 2075 | ); |
| 2076 | |
| 2077 | $r = wp_parse_args( $args, $defaults ); |
| 2078 | extract( $r, EXTR_SKIP ); |
| 2079 | |
| 2080 | $key = md5( serialize( compact(array_keys($defaults)) ) ); |
| 2081 | if ( $cache = wp_cache_get( 'get_pages', 'posts' ) ) { |
| 2082 | if ( isset( $cache[ $key ] ) ) { |
| 2083 | $pages = apply_filters('get_pages', $cache[ $key ], $r ); |
| 2084 | return $pages; |
| 2085 | } |
| 2086 | } |
| 2087 | |
| 2088 | $inclusions = ''; |
| 2089 | if ( !empty($include) ) { |
| 2090 | $child_of = 0; //ignore child_of, parent, exclude, meta_key, and meta_value params if using include |
| 2091 | $parent = -1; |
| 2092 | $exclude = ''; |
| Line | Code |
| 2166 | $where .= $wpdb->prepare(' AND post_parent = %d ', $parent); |
| 2167 | |
| 2168 | $query = "SELECT * FROM $wpdb->posts $join WHERE (post_type = 'page' AND post_status = 'publish') $where "; |
| 2169 | $query .= $author_query; |
| 2170 | $query .= " ORDER BY " . $sort_column . " " . $sort_order ; |
| 2171 | |
| 2172 | $pages = $wpdb->get_results($query); |
| 2173 | |
| 2174 | if ( empty($pages) ) { |
| 2175 | $pages = apply_filters('get_pages', array(), $r); |
| 2176 | return $pages; |
| 2177 | } |
| 2178 | |
| 2179 | // Update cache. |
| 2180 | update_page_cache($pages); |
| 2181 | |
| 2182 | if ( $child_of || $hierarchical ) |
| 2183 | $pages = & get_page_children($child_of, $pages); |
| 2184 | |
| Line | Code |
| 2195 | for ( $i = 0; $i < $total; $i++ ) { |
| 2196 | if ( in_array($pages[$i]->ID, $excludes) ) |
| 2197 | unset($pages[$i]); |
| 2198 | } |
| 2199 | } |
| 2200 | |
| 2201 | $cache[ $key ] = $pages; |
| 2202 | wp_cache_set( 'get_pages', $cache, 'posts' ); |
| 2203 | |
| 2204 | $pages = apply_filters('get_pages', $pages, $r); |
| 2205 | |
| 2206 | return $pages; |
| 2207 | } |
| 2208 | |
| 2209 | // |
| 2210 | // Attachment functions |
| 2211 | // |
| 2212 | |
| 2213 | /** |