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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 |
---|---|
1379 |
|
1380 | $title = str_replace('%title', $post->post_title, $title); |
1381 | $title = str_replace('%date', $date, $title); |
1382 | $title = apply_filters('the_title', $title, $post->ID); |
1383 |
|
1384 | $link = "<link rel='up' title='"; |
1385 | $link .= esc_attr( $title ); |
1386 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
1387 |
|
1388 | return apply_filters( "parent_post_rel_link", $link ); |
1389 | } |
1390 |
|
1391 | /** |
1392 | * Display relational link for parent item |
1393 | * |
1394 | * @since 2.8.0 |
1395 | */ |
1396 | function parent_post_rel_link($title = '%title') { |
1397 | echo get_parent_post_rel_link($title); |