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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 |
---|---|
175 | <wp:wxr_version><?php echo WXR_VERSION; ?></wp:wxr_version> |
176 | <wp:base_site_url><?php echo wxr_site_url(); ?></wp:base_site_url> |
177 | <wp:base_blog_url><?php bloginfo_rss('url'); ?></wp:base_blog_url> |
178 | <?php if ( $cats ) : foreach ( $cats as $c ) : ?> |
179 | <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> |
180 | <?php endforeach; endif; ?> |
181 | <?php if ( $tags ) : foreach ( $tags as $t ) : ?> |
182 | <wp:tag><wp:tag_slug><?php echo $t->slug; ?></wp:tag_slug><?php wxr_tag_name($t); ?><?php wxr_tag_description($t); ?></wp:tag> |
183 | <?php endforeach; endif; ?> |
184 | <?php do_action('rss2_head'); ?> |
185 | <?php if ($post_ids) { |
186 | global $wp_query; |
187 | $wp_query->in_the_loop = true; // Fake being in the loop. |
188 | // fetch 20 posts at a time rather than loading the entire table into memory |
189 | while ( $next_posts = array_splice($post_ids, 0, 20) ) { |
190 | $where = "WHERE ID IN (".join(',', $next_posts).")"; |
191 | $posts = $wpdb->get_results("SELECT * FROM $wpdb->posts $where ORDER BY post_date_gmt ASC"); |
192 | foreach ($posts as $post) { |
193 | setup_postdata($post); ?> |