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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 | 
|---|---|
| 525 |  | 
| 526 |           /** | 
| 527 |            * Fires immediately after the user has been given a new role. | 
| 528 |            * | 
| 529 |            * @since 4.3.0 | 
| 530 |            * | 
| 531 |            * @param int    $user_id The user ID. | 
| 532 |            * @param string $role    The new role. | 
| 533 |            */ | 
| 534 |           do_action( 'add_user_role', $this->ID, $role ); | 
| 535 |      } | 
| 536 |  | 
| 537 |      /** | 
| 538 |       * Remove role from user. | 
| 539 |       * | 
| 540 |       * @since 2.0.0 | 
| 541 |       * | 
| 542 |       * @param string $role Role name. | 
| 543 |       */ |