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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 |
---|---|
333 | $link_notes = ''; |
334 | $link_notes = apply_filters('pre_link_notes', $link_notes); |
335 |
|
336 | if ( empty($link_description) ) |
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 | } |