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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 |
|---|---|
| 919 | $tb_url = get_option('siteurl') . '/wp-trackback.php?p=' . get_the_ID(); |
| 920 | |
| 921 | /** |
| 922 | * Filter the returned trackback URL. |
| 923 | * |
| 924 | * @since 2.2.0 |
| 925 | * |
| 926 | * @param string $tb_url The trackback URL. |
| 927 | */ |
| 928 | return apply_filters( 'trackback_url', $tb_url ); |
| 929 | } |
| 930 | |
| 931 | /** |
| 932 | * Display the current post's trackback URL. |
| 933 | * |
| 934 | * @since 0.71 |
| 935 | * |
| 936 | * @param bool $deprecated_echo Not used. |
| 937 | * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() |