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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 |
|---|---|
| 421 | * Filter whether the upgrader cleared the destination. |
| 422 | * |
| 423 | * @since 2.8.0 |
| 424 | * |
| 425 | * @param bool $removed Whether the destination was cleared. |
| 426 | * @param string $local_destination The local package destination. |
| 427 | * @param string $remote_destination The remote package destination. |
| 428 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 429 | */ |
| 430 | $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] ); |
| 431 | |
| 432 | if ( is_wp_error($removed) ) { |
| 433 | return $removed; |
| 434 | } else if ( ! $removed ) { |
| 435 | return new WP_Error('remove_old_failed', $this->strings['remove_old_failed']); |
| 436 | } |
| 437 | } elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists($remote_destination) ) { |
| 438 | //If we're not clearing the destination folder and something exists there already, Bail. |
| 439 | //But first check to see if there are actually any files in the folder. |