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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 |
|---|---|
| 537 | * Filters whether the upgrader cleared the destination. |
| 538 | * |
| 539 | * @since 2.8.0 |
| 540 | * |
| 541 | * @param mixed $removed Whether the destination was cleared. true on success, WP_Error on failure |
| 542 | * @param string $local_destination The local package destination. |
| 543 | * @param string $remote_destination The remote package destination. |
| 544 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 545 | */ |
| 546 | $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] ); |
| 547 | |
| 548 | if ( is_wp_error( $removed ) ) { |
| 549 | return $removed; |
| 550 | } |
| 551 | } elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists($remote_destination) ) { |
| 552 | //If we're not clearing the destination folder and something exists there already, Bail. |
| 553 | //But first check to see if there are actually any files in the folder. |
| 554 | $_files = $wp_filesystem->dirlist($remote_destination); |
| 555 | if ( ! empty($_files) ) { |