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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 |
|---|---|
| 1148 | } |
| 1149 | |
| 1150 | /** |
| 1151 | * Filters the returned trackback URL. |
| 1152 | * |
| 1153 | * @since 2.2.0 |
| 1154 | * |
| 1155 | * @param string $tb_url The trackback URL. |
| 1156 | */ |
| 1157 | return apply_filters( 'trackback_url', $tb_url ); |
| 1158 | } |
| 1159 | |
| 1160 | /** |
| 1161 | * Displays the current post's trackback URL. |
| 1162 | * |
| 1163 | * @since 0.71 |
| 1164 | * |
| 1165 | * @param bool $deprecated_echo Not used. |
| 1166 | * @return void|string Should only be used to echo the trackback URL, use get_trackback_url() |