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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 |
|---|---|
| 414 | * Returning a truthy value, or one that could be evaluated as a WP_Error |
| 415 | * will effectively short-circuit the installation, returning that value |
| 416 | * instead. |
| 417 | * |
| 418 | * @since 2.8.0 |
| 419 | * |
| 420 | * @param bool|WP_Error $response Response. |
| 421 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 422 | */ |
| 423 | $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); |
| 424 | if ( is_wp_error( $res ) ) { |
| 425 | return $res; |
| 426 | } |
| 427 | |
| 428 | //Retain the Original source and destinations |
| 429 | $remote_source = $args['source']; |
| 430 | $local_destination = $destination; |
| 431 | |
| 432 | $source_files = array_keys( $wp_filesystem->dirlist( $remote_source ) ); |