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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 |
|---|---|
| 132 | $category_nicename = sanitize_title($cat_name, $cat_ID ); |
| 133 | $wpdb->query( "UPDATE $wpdb->categories SET category_nicename = '$category_nicename' WHERE cat_ID = '$cat_ID'" ); |
| 134 | } |
| 135 | |
| 136 | // Keep in mind when using this filter and altering the cat_ID that the two queries above |
| 137 | // have already taken place with the OLD cat_ID |
| 138 | // Also note that you may have post2cat entries with the old cat_ID if this is an update |
| 139 | |
| 140 | if ($update) { |
| 141 | do_action('edit_category', $cat_ID); |
| 142 | } else { |
| 143 | do_action('create_category', $cat_ID); |
| 144 | do_action('add_category', $cat_ID); |
| 145 | } |
| 146 | |
| 147 | $cat_ID = apply_filters('cat_id_filter', $cat_ID, $update); |
| 148 | |
| 149 | clean_category_cache($cat_ID); |
| 150 | |
| Line | Code |
| 408 | global $wpdb; |
| 409 | |
| 410 | do_action('delete_link', $link_id); |
| 411 | |
| 412 | $categories = wp_get_link_cats($link_id); |
| 413 | if( is_array( $categories ) ) { |
| 414 | foreach ( $categories as $category ) { |
| 415 | $wpdb->query("UPDATE $wpdb->categories SET link_count = link_count - 1 WHERE cat_ID = '$category'"); |
| 416 | wp_cache_delete($category, 'category'); |
| 417 | do_action('edit_category', $cat_id); |
| 418 | } |
| 419 | } |
| 420 | |
| 421 | $wpdb->query("DELETE FROM $wpdb->link2cat WHERE link_id = '$link_id'"); |
| 422 | return $wpdb->query("DELETE FROM $wpdb->links WHERE link_id = '$link_id'"); |
| 423 | |
| 424 | do_action('deleted_link', $link_id); |
| 425 | } |
| 426 | |
| Line | Code |
| 487 | } |
| 488 | } |
| 489 | |
| 490 | // Update category counts. |
| 491 | $all_affected_cats = array_unique(array_merge($link_categories, $old_categories)); |
| 492 | foreach ( $all_affected_cats as $cat_id ) { |
| 493 | $count = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->link2cat, $wpdb->links WHERE $wpdb->links.link_id = $wpdb->link2cat.link_id AND category_id = '$cat_id'"); |
| 494 | $wpdb->query("UPDATE $wpdb->categories SET link_count = '$count' WHERE cat_ID = '$cat_id'"); |
| 495 | wp_cache_delete($cat_id, 'category'); |
| 496 | do_action('edit_category', $cat_id); |
| 497 | } |
| 498 | |
| 499 | } // wp_set_link_cats() |
| 500 | |
| 501 | function post_exists($title, $content = '', $post_date = '') { |
| 502 | global $wpdb; |
| 503 | |
| 504 | if (!empty ($post_date)) |
| 505 | $post_date = "AND post_date = '$post_date'"; |