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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 |
|---|---|
| 1381 | |
| 1382 | $title = str_replace('%title', $post->post_title, $title); |
| 1383 | $title = str_replace('%date', $date, $title); |
| 1384 | $title = apply_filters('the_title', $title, $post->ID); |
| 1385 | |
| 1386 | $link = "<link rel='up' title='"; |
| 1387 | $link .= esc_attr( $title ); |
| 1388 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1389 | |
| 1390 | return apply_filters( "parent_post_rel_link", $link ); |
| 1391 | } |
| 1392 | |
| 1393 | /** |
| 1394 | * Display relational link for parent item |
| 1395 | * |
| 1396 | * @since 2.8.0 |
| 1397 | */ |
| 1398 | function parent_post_rel_link($title = '%title') { |
| 1399 | echo get_parent_post_rel_link($title); |