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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 |
|---|---|
| 347 | * Returning a truthy value, or one that could be evaluated as a WP_Error |
| 348 | * will effectively short-circuit the installation, returning that value |
| 349 | * instead. |
| 350 | * |
| 351 | * @since 2.8.0 |
| 352 | * |
| 353 | * @param bool|WP_Error $response Response. |
| 354 | * @param array $hook_extra Extra arguments passed to hooked filters. |
| 355 | */ |
| 356 | $res = apply_filters( 'upgrader_pre_install', true, $args['hook_extra'] ); |
| 357 | if ( is_wp_error( $res ) ) { |
| 358 | return $res; |
| 359 | } |
| 360 | |
| 361 | //Retain the Original source and destinations |
| 362 | $remote_source = $args['source']; |
| 363 | $local_destination = $destination; |
| 364 | |
| 365 | $source_files = array_keys( $wp_filesystem->dirlist( $remote_source ) ); |