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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 |
|---|---|
| 41 | function wp_delete_link($link_id) { |
| 42 | global $wpdb; |
| 43 | |
| 44 | do_action('delete_link', $link_id); |
| 45 | |
| 46 | wp_delete_object_term_relationships($link_id, 'link_category'); |
| 47 | |
| 48 | $wpdb->query("DELETE FROM $wpdb->links WHERE link_id = '$link_id'"); |
| 49 | |
| 50 | do_action('deleted_link', $link_id); |
| 51 | |
| 52 | return true; |
| 53 | } |
| 54 | |
| 55 | function wp_get_link_cats($link_id = 0) { |
| 56 | |
| 57 | $cats = wp_get_object_terms($link_id, 'link_category', 'fields=ids'); |
| 58 | |
| 59 | return array_unique($cats); |