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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 |
|---|---|
| 1189 | |
| 1190 | $title = str_replace('%title', $post->post_title, $title); |
| 1191 | $title = str_replace('%date', $date, $title); |
| 1192 | $title = apply_filters('the_title', $title, $post); |
| 1193 | |
| 1194 | $link = "<link rel='up' title='"; |
| 1195 | $link .= esc_attr( $title ); |
| 1196 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 1197 | |
| 1198 | return apply_filters( "parent_post_rel_link", $link ); |
| 1199 | } |
| 1200 | |
| 1201 | /** |
| 1202 | * Display relational link for parent item |
| 1203 | * |
| 1204 | * @since 2.8.0 |
| 1205 | */ |
| 1206 | function parent_post_rel_link($title = '%title') { |
| 1207 | echo get_parent_post_rel_link($title); |