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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 |
|---|---|
| 1993 | 'authors' => '' |
| 1994 | ); |
| 1995 | |
| 1996 | $r = wp_parse_args( $args, $defaults ); |
| 1997 | extract( $r, EXTR_SKIP ); |
| 1998 | |
| 1999 | $key = md5( serialize( $r ) ); |
| 2000 | if ( $cache = wp_cache_get( 'get_pages', 'posts' ) ) |
| 2001 | if ( isset( $cache[ $key ] ) ) |
| 2002 | return apply_filters('get_pages', $cache[ $key ], $r ); |
| 2003 | |
| 2004 | $inclusions = ''; |
| 2005 | if ( !empty($include) ) { |
| 2006 | $child_of = 0; //ignore child_of, exclude, meta_key, and meta_value params if using include |
| 2007 | $exclude = ''; |
| 2008 | $meta_key = ''; |
| 2009 | $meta_value = ''; |
| 2010 | $hierarchical = false; |
| 2011 | $incpages = preg_split('/[\s,]+/',$include); |
| Line | Code |
| 2077 | |
| 2078 | } |
| 2079 | $query = "SELECT * FROM $wpdb->posts $join WHERE (post_type = 'page' AND post_status = 'publish') $where "; |
| 2080 | $query .= $author_query; |
| 2081 | $query .= " ORDER BY " . $sort_column . " " . $sort_order ; |
| 2082 | |
| 2083 | $pages = $wpdb->get_results($query); |
| 2084 | |
| 2085 | if ( empty($pages) ) |
| 2086 | return apply_filters('get_pages', array(), $r); |
| 2087 | |
| 2088 | // Update cache. |
| 2089 | update_page_cache($pages); |
| 2090 | |
| 2091 | if ( $child_of || $hierarchical ) |
| 2092 | $pages = & get_page_children($child_of, $pages); |
| 2093 | |
| 2094 | $cache[ $key ] = $pages; |
| 2095 | wp_cache_set( 'get_pages', $cache, 'posts' ); |
| 2096 | |
| 2097 | $pages = apply_filters('get_pages', $pages, $r); |
| 2098 | |
| 2099 | return $pages; |
| 2100 | } |
| 2101 | |
| 2102 | // |
| 2103 | // Attachment functions |
| 2104 | // |
| 2105 | |
| 2106 | /** |