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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 |
|---|---|
| 560 | * Filters whether the upgrader cleared the destination. |
| 561 | * |
| 562 | * @since 2.8.0 |
| 563 | * |
| 564 | * @param true|WP_Error $removed Whether the destination was cleared. true upon success, WP_Error on failure. |
| 565 | * @param string $local_destination The local package destination. |
| 566 | * @param string $remote_destination The remote package destination. |
| 567 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 568 | */ |
| 569 | $removed = apply_filters( 'upgrader_clear_destination', $removed, $local_destination, $remote_destination, $args['hook_extra'] ); |
| 570 | |
| 571 | if ( is_wp_error( $removed ) ) { |
| 572 | return $removed; |
| 573 | } |
| 574 | } elseif ( $args['abort_if_destination_exists'] && $wp_filesystem->exists( $remote_destination ) ) { |
| 575 | // If we're not clearing the destination folder and something exists there already, bail. |
| 576 | // But first check to see if there are actually any files in the folder. |
| 577 | $_files = $wp_filesystem->dirlist( $remote_destination ); |
| 578 | if ( ! empty( $_files ) ) { |