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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 | 
|---|---|
| 444 |      unset( $wp_taxonomies[ $taxonomy ] ); | 
| 445 |  | 
| 446 |      /** | 
| 447 |       * Fires after a taxonomy is unregistered. | 
| 448 |       * | 
| 449 |       * @since 4.5.0 | 
| 450 |       * | 
| 451 |       * @param string $taxonomy Taxonomy name. | 
| 452 |       */ | 
| 453 |      do_action( 'unregistered_taxonomy', $taxonomy ); | 
| 454 |  | 
| 455 |      return true; | 
| 456 | } | 
| 457 |  | 
| 458 | /** | 
| 459 |  * Builds an object with all taxonomy labels out of a taxonomy object. | 
| 460 |  * | 
| 461 |  * @since 3.0.0 | 
| 462 |  * @since 4.3.0 Added the `no_terms` label. |