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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 |
|---|---|
| 1129 | } |
| 1130 | |
| 1131 | /** |
| 1132 | * Filters the returned trackback URL. |
| 1133 | * |
| 1134 | * @since 2.2.0 |
| 1135 | * |
| 1136 | * @param string $tb_url The trackback URL. |
| 1137 | */ |
| 1138 | return apply_filters( 'trackback_url', $tb_url ); |
| 1139 | } |
| 1140 | |
| 1141 | /** |
| 1142 | * Display the current post's trackback URL. |
| 1143 | * |
| 1144 | * @since 0.71 |
| 1145 | * |
| 1146 | * @param bool $deprecated_echo Not used. |
| 1147 | * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() |