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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 |
|---|---|
| 2234 | $r = wp_parse_args( $args, $defaults ); |
| 2235 | extract( $r, EXTR_SKIP ); |
| 2236 | $number = (int) $number; |
| 2237 | $offset = (int) $offset; |
| 2238 | |
| 2239 | $cache = array(); |
| 2240 | $key = md5( serialize( compact(array_keys($defaults)) ) ); |
| 2241 | if ( $cache = wp_cache_get( 'get_pages', 'posts' ) ) { |
| 2242 | if ( is_array($cache) && isset( $cache[ $key ] ) ) { |
| 2243 | $pages = apply_filters('get_pages', $cache[ $key ], $r ); |
| 2244 | return $pages; |
| 2245 | } |
| 2246 | } |
| 2247 | |
| 2248 | if ( !is_array($cache) ) |
| 2249 | $cache = array(); |
| 2250 | |
| 2251 | $inclusions = ''; |
| 2252 | if ( !empty($include) ) { |
| Line | Code |
| 2332 | $query .= $author_query; |
| 2333 | $query .= " ORDER BY " . $sort_column . " " . $sort_order ; |
| 2334 | |
| 2335 | if ( !empty($number) ) |
| 2336 | $query .= ' LIMIT ' . $offset . ',' . $number; |
| 2337 | |
| 2338 | $pages = $wpdb->get_results($query); |
| 2339 | |
| 2340 | if ( empty($pages) ) { |
| 2341 | $pages = apply_filters('get_pages', array(), $r); |
| 2342 | return $pages; |
| 2343 | } |
| 2344 | |
| 2345 | // Update cache. |
| 2346 | update_page_cache($pages); |
| 2347 | |
| 2348 | if ( $child_of || $hierarchical ) |
| 2349 | $pages = & get_page_children($child_of, $pages); |
| 2350 | |
| Line | Code |
| 2361 | for ( $i = 0; $i < $total; $i++ ) { |
| 2362 | if ( in_array($pages[$i]->ID, $excludes) ) |
| 2363 | unset($pages[$i]); |
| 2364 | } |
| 2365 | } |
| 2366 | |
| 2367 | $cache[ $key ] = $pages; |
| 2368 | wp_cache_set( 'get_pages', $cache, 'posts' ); |
| 2369 | |
| 2370 | $pages = apply_filters('get_pages', $pages, $r); |
| 2371 | |
| 2372 | return $pages; |
| 2373 | } |
| 2374 | |
| 2375 | // |
| 2376 | // Attachment functions |
| 2377 | // |
| 2378 | |
| 2379 | /** |