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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 |
|---|---|
| 613 | * @type string $package Package for update. |
| 614 | * @type string $destination Update location. |
| 615 | * @type bool $clear_destination Clear the destination resource. |
| 616 | * @type bool $clear_working Clear the working resource. |
| 617 | * @type bool $abort_if_destination_exists Abort if the Destination directory exists. |
| 618 | * @type bool $is_multi Whether the upgrader is running multiple times. |
| 619 | * @type array $hook_extra Extra hook arguments. |
| 620 | * } |
| 621 | */ |
| 622 | $options = apply_filters( 'upgrader_package_options', $options ); |
| 623 | |
| 624 | if ( ! $options['is_multi'] ) { // call $this->header separately if running multiple times |
| 625 | $this->skin->header(); |
| 626 | } |
| 627 | |
| 628 | // Connect to the Filesystem first. |
| 629 | $res = $this->fs_connect( array( WP_CONTENT_DIR, $options['destination'] ) ); |
| 630 | // Mainly for non-connected filesystem. |
| 631 | if ( ! $res ) { |