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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 |
|---|---|
| 250 | <wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version> |
| 251 | <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url> |
| 252 | <wp:base_blog_url><?php bloginfo_rss('url'); ?></wp:base_blog_url> |
| 253 | <?php if ( $cats ) : foreach ( $cats as $c ) : ?> |
| 254 | <wp:category><wp:category_nicename><?php echo $c->slug; ?></wp:category_nicename><wp:category_parent><?php echo $c->parent ? $cats[$c->parent]->name : ''; ?></wp:category_parent><?php wxr_cat_name($c); ?><?php wxr_category_description($c); ?></wp:category> |
| 255 | <?php endforeach; endif; ?> |
| 256 | <?php if ( $tags ) : foreach ( $tags as $t ) : ?> |
| 257 | <wp:tag><wp:tag_slug><?php echo $t->slug; ?></wp:tag_slug><?php wxr_tag_name($t); ?><?php wxr_tag_description($t); ?></wp:tag> |
| 258 | <?php endforeach; endif; ?> |
| 259 | <?php do_action('rss2_head'); ?> |
| 260 | <?php if ($post_ids) { |
| 261 | global $wp_query; |
| 262 | $wp_query->in_the_loop = true; // Fake being in the loop. |
| 263 | // fetch 20 posts at a time rather than loading the entire table into memory |
| 264 | while ( $next_posts = array_splice($post_ids, 0, 20) ) { |
| 265 | $where = "WHERE ID IN (".join(',', $next_posts).")"; |
| 266 | $posts = $wpdb->get_results("SELECT * FROM $wpdb->posts $where ORDER BY post_date_gmt ASC"); |
| 267 | foreach ($posts as $post) { |
| 268 | // Don't export revisions. They bloat the export. |