wp-admin/includes/class-wp-upgrader.php:413Flattens the results of WP_Filesystem_Base::dirlist() for iterating over.
$nested_filesarray$pathstringoptional''array protected function flatten_dirlist( $nested_files, $path = '' ) { $files = array(); foreach ( $nested_files as $name => $details ) { $files[ $path . $name ] = $details; // Append children recursively. if ( ! empty( $details['files'] ) ) { $children = $this->flatten_dirlist( $details['files'], $path . $name . '/' ); // Merge keeping possible numeric keys, which array_merge() will reindex from 0..n. $files = $files + $children; } } return $files; }Introduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-admin/includes/class-wp-upgrader.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.