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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 |
|---|---|
| 2759 | |
| 2760 | $title = str_replace('%title', $post->post_title, $title); |
| 2761 | $title = str_replace('%date', $date, $title); |
| 2762 | $title = apply_filters('the_title', $title, $post->ID); |
| 2763 | |
| 2764 | $link = "<link rel='up' title='"; |
| 2765 | $link .= esc_attr( $title ); |
| 2766 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 2767 | |
| 2768 | return apply_filters( "parent_post_rel_link", $link ); |
| 2769 | } |
| 2770 | |
| 2771 | /** |
| 2772 | * Display relational link for parent item |
| 2773 | * |
| 2774 | * @since 2.8.0 |
| 2775 | * @deprecated 3.3.0 |
| 2776 | * |
| 2777 | * @param string $title Optional. Link title format. Default '%title'. |