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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 |
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413 |
|
414 | do_action('delete_post', $postid); |
415 |
|
416 | if ( 'publish' == $post->post_status && 'post' == $post->post_type ) { |
417 | $categories = wp_get_post_categories($post->ID); |
418 | if( is_array( $categories ) ) { |
419 | foreach ( $categories as $cat_id ) { |
420 | $wpdb->query("UPDATE $wpdb->categories SET category_count = category_count - 1 WHERE cat_ID = '$cat_id'"); |
421 | wp_cache_delete($cat_id, 'category'); |
422 | do_action('edit_category', $cat_id); |
423 | } |
424 | } |
425 | } |
426 |
|
427 | if ( 'page' == $post->post_type ) |
428 | $wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'page'"); |
429 |
|
430 | $wpdb->query("UPDATE $wpdb->posts SET post_parent = $post->post_parent WHERE post_parent = $postid AND post_type = 'attachment'"); |
431 |
|
Line | Code |
806 | } |
807 | } |
808 |
|
809 | // Update category counts. |
810 | $all_affected_cats = array_unique(array_merge($post_categories, $old_categories)); |
811 | foreach ( $all_affected_cats as $cat_id ) { |
812 | $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'"); |
813 | $wpdb->query("UPDATE $wpdb->categories SET category_count = '$count' WHERE cat_ID = '$cat_id'"); |
814 | clean_category_cache($cat_id); |
815 | do_action('edit_category', $cat_id); |
816 | } |
817 | } // wp_set_post_categories() |
818 |
|
819 | // |
820 | // Trackback and ping functions |
821 | // |
822 |
|
823 | function add_ping($post_id, $uri) { // Add a URL to those already pung |
824 | global $wpdb; |