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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 | 
|---|---|
| 360 |                submit_button( $title, 'apply', 'delete_all', false ); | 
| 361 |           } | 
| 362 |           /** | 
| 363 |            * Fires after the Filter submit button for comment types. | 
| 364 |            * | 
| 365 |            * @since 2.5.0 | 
| 366 |            * | 
| 367 |            * @param string $comment_status The comment status name. Default 'All'. | 
| 368 |            */ | 
| 369 |           do_action( 'manage_comments_nav', $comment_status ); | 
| 370 |           echo '</div>'; | 
| 371 |      } | 
| 372 |  | 
| 373 |      /** | 
| 374 |       * @return string|false | 
| 375 |       */ | 
| 376 |      public function current_action() { | 
| 377 |           if ( isset( $_REQUEST['delete_all'] ) || isset( $_REQUEST['delete_all2'] ) ) | 
| 378 |                return 'delete_all'; |