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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 |
|---|---|
| 1193 | } |
| 1194 | |
| 1195 | /** |
| 1196 | * Filters the returned trackback URL. |
| 1197 | * |
| 1198 | * @since 2.2.0 |
| 1199 | * |
| 1200 | * @param string $trackback_url The trackback URL. |
| 1201 | */ |
| 1202 | return apply_filters( 'trackback_url', $trackback_url ); |
| 1203 | } |
| 1204 | |
| 1205 | /** |
| 1206 | * Displays the current post's trackback URL. |
| 1207 | * |
| 1208 | * @since 0.71 |
| 1209 | * |
| 1210 | * @param bool $deprecated_echo Not used. |
| 1211 | * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() |