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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 |
|---|---|
| 337 | $link_description = ''; |
| 338 | $link_description = apply_filters('pre_link_description', $link_description); |
| 339 | |
| 340 | if ( empty($link_rss) ) |
| 341 | $link_rss = ''; |
| 342 | $link_rss = apply_filters('pre_link_rss', $link_rss); |
| 343 | |
| 344 | if ( empty($link_rel) ) |
| 345 | $link_rel = ''; |
| 346 | $link_rel = apply_filters('pre_link_rel', $link_rel); |
| 347 | |
| 348 | // Make sure we set a valid category |
| 349 | if (0 == count($link_category) || !is_array($link_category)) { |
| 350 | $link_category = array(get_option('default_link_category')); |
| 351 | } |
| 352 | |
| 353 | if ( $update ) { |
| 354 | $wpdb->query("UPDATE $wpdb->links SET link_url='$link_url', |
| 355 | link_name='$link_name', link_image='$link_image', |