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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 |
|---|---|
| 486 | * Filter whether the upgrader cleared the destination. |
| 487 | * |
| 488 | * @since 2.8.0 |
| 489 | * |
| 490 | * @param mixed $removed Whether the destination was cleared. true on success, WP_Error on failure |
| 491 | * @param string $local_destination The local package destination. |
| 492 | * @param string $remote_destination The remote package destination. |
| 493 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 494 | */ |
| 495 | $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] ); |
| 496 | |
| 497 | if ( is_wp_error( $removed ) ) { |
| 498 | return $removed; |
| 499 | } |
| 500 | } elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists($remote_destination) ) { |
| 501 | //If we're not clearing the destination folder and something exists there already, Bail. |
| 502 | //But first check to see if there are actually any files in the folder. |
| 503 | $_files = $wp_filesystem->dirlist($remote_destination); |
| 504 | if ( ! empty($_files) ) { |