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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 | 
|---|---|
| 515 |                          wp_redirect( $redirect ); | 
| 516 |                          exit; | 
| 517 |                     } | 
| 518 |  | 
| 519 |                     $auto_updates = $new_auto_updates; | 
| 520 |                     $redirect     = add_query_arg( $query_args, $redirect ); | 
| 521 |                } | 
| 522 |  | 
| 523 |                /** This filter is documented in wp-admin/includes/class-wp-plugins-list-table.php */ | 
| 524 |                $all_items = apply_filters( 'all_plugins', get_plugins() ); | 
| 525 |  | 
| 526 |                // Remove plugins that don't exist or have been deleted since the option was last updated. | 
| 527 |                $auto_updates = array_intersect( $auto_updates, array_keys( $all_items ) ); | 
| 528 |  | 
| 529 |                update_site_option( 'auto_update_plugins', $auto_updates ); | 
| 530 |  | 
| 531 |                wp_redirect( $redirect ); | 
| 532 |                exit; | 
| 533 |           default: |