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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 |
|---|---|
| 2796 | |
| 2797 | $title = str_replace('%title', $post->post_title, $title); |
| 2798 | $title = str_replace('%date', $date, $title); |
| 2799 | $title = apply_filters('the_title', $title, $post->ID); |
| 2800 | |
| 2801 | $link = "<link rel='up' title='"; |
| 2802 | $link .= esc_attr( $title ); |
| 2803 | $link .= "' href='" . get_permalink($post) . "' />\n"; |
| 2804 | |
| 2805 | return apply_filters( "parent_post_rel_link", $link ); |
| 2806 | } |
| 2807 | |
| 2808 | /** |
| 2809 | * Display relational link for parent item |
| 2810 | * |
| 2811 | * @since 2.8.0 |
| 2812 | * @deprecated 3.3.0 |
| 2813 | */ |
| 2814 | function parent_post_rel_link($title = '%title') { |