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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 | 
|---|---|
| 465 |                } | 
| 466 |           } // End foreach $themes. | 
| 467 |  | 
| 468 |           $this->maintenance_mode( false ); | 
| 469 |  | 
| 470 |           // Refresh the Theme Update information. | 
| 471 |           wp_clean_themes_cache( $parsed_args['clear_update_cache'] ); | 
| 472 |  | 
| 473 |           /** This action is documented in wp-admin/includes/class-wp-upgrader.php */ | 
| 474 |           do_action( | 
| 475 |                'upgrader_process_complete', | 
| 476 |                $this, | 
| 477 |                array( | 
| 478 |                     'action' => 'update', | 
| 479 |                     'type'   => 'theme', | 
| 480 |                     'bulk'   => true, | 
| 481 |                     'themes' => $themes, | 
| 482 |                ) | 
| 483 |           ); |