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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 |
|---|---|
| 310 | $link_description = ''; |
| 311 | $link_description = apply_filters('pre_link_description', $link_description); |
| 312 | |
| 313 | if ( empty($link_rss) ) |
| 314 | $link_rss = ''; |
| 315 | $link_rss = apply_filters('pre_link_rss', $link_rss); |
| 316 | |
| 317 | if ( empty($link_rel) ) |
| 318 | $link_rel = ''; |
| 319 | $link_rel = apply_filters('pre_link_rel', $link_rel); |
| 320 | |
| 321 | if ( $update ) { |
| 322 | $wpdb->query("UPDATE $wpdb->links SET link_url='$link_url', |
| 323 | link_name='$link_name', link_image='$link_image', |
| 324 | link_target='$link_target', link_category='$link_category', |
| 325 | link_visible='$link_visible', link_description='$link_description', |
| 326 | link_rating='$link_rating', link_rel='$link_rel', |
| 327 | link_notes='$link_notes', link_rss = '$link_rss' |
| 328 | WHERE link_id='$link_id'"); |