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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 2 times in this file.
| Line | Code |
|---|---|
| 406 | |
| 407 | do_action('delete_post', $postid); |
| 408 | |
| 409 | if ( 'publish' == $post->post_status && 'post' == $post->post_type ) { |
| 410 | $categories = wp_get_post_categories($post->ID); |
| 411 | if( is_array( $categories ) ) { |
| 412 | foreach ( $categories as $cat_id ) { |
| 413 | $wpdb->query("UPDATE $wpdb->categories SET category_count = category_count - 1 WHERE cat_ID = '$cat_id'"); |
| 414 | wp_cache_delete($cat_id, 'category'); |
| 415 | do_action('edit_category', $cat_id); |
| 416 | } |
| 417 | } |
| 418 | } |
| 419 | |
| 420 | if ( 'page' == $post->post_type ) |
| 421 | $wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'page'"); |
| 422 | |
| 423 | $wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'attachment'"); |
| 424 | |
| Line | Code |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | // Update category counts. |
| 815 | $all_affected_cats = array_unique(array_merge($post_categories, $old_categories)); |
| 816 | foreach ( $all_affected_cats as $cat_id ) { |
| 817 | $count = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->post2cat, $wpdb->posts WHERE $wpdb->posts.ID=$wpdb->post2cat.post_id AND post_status = 'publish' AND post_type = 'post' AND category_id = '$cat_id'"); |
| 818 | $wpdb->query("UPDATE $wpdb->categories SET category_count = '$count' WHERE cat_ID = '$cat_id'"); |
| 819 | clean_category_cache($cat_id); |
| 820 | do_action('edit_category', $cat_id); |
| 821 | } |
| 822 | } // wp_set_post_categories() |
| 823 | |
| 824 | // |
| 825 | // Trackback and ping functions |
| 826 | // |
| 827 | |
| 828 | function add_ping($post_id, $uri) { // Add a URL to those already pung |
| 829 | global $wpdb; |