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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 | 
|---|---|
| 2515 |       * taxonomy the term belonged to. | 
| 2516 |       * | 
| 2517 |       * @since 2.3.0 | 
| 2518 |       * | 
| 2519 |       * @param int     $term         Term ID. | 
| 2520 |       * @param int     $tt_id        Term taxonomy ID. | 
| 2521 |       * @param mixed   $deleted_term Copy of the already-deleted term, in the form specified | 
| 2522 |       *                              by the parent function. {@see WP_Error} otherwise. | 
| 2523 |       */ | 
| 2524 |      do_action( "delete_$taxonomy", $term, $tt_id, $deleted_term ); | 
| 2525 |  | 
| 2526 |      return true; | 
| 2527 | } | 
| 2528 |  | 
| 2529 | /** | 
| 2530 |  * Deletes one existing category. | 
| 2531 |  * | 
| 2532 |  * @since 2.0.0 | 
| 2533 |  * |