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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 | 
|---|---|
| 752 |           if ( !empty( $role ) ) { | 
| 753 |                $this->caps[$role] = true; | 
| 754 |                $this->roles = array( $role => true ); | 
| 755 |           } else { | 
| 756 |                $this->roles = false; | 
| 757 |           } | 
| 758 |           update_user_meta( $this->ID, $this->cap_key, $this->caps ); | 
| 759 |           $this->get_role_caps(); | 
| 760 |           $this->update_user_level_from_caps(); | 
| 761 |           do_action( 'set_user_role', $this->ID, $role ); | 
| 762 |      } | 
| 763 |  | 
| 764 |      /** | 
| 765 |       * Choose the maximum level the user has. | 
| 766 |       * | 
| 767 |       * Will compare the level from the $item parameter against the $max | 
| 768 |       * parameter. If the item is incorrect, then just the $max parameter value | 
| 769 |       * will be returned. | 
| 770 |       * |