RecursiveExtensionFilterIterator example

// Allow directories specified in settings.php to be ignored. You can use     // this to not check for files in common special-purpose directories. For     // example, node_modules and bower_components. Ignoring irrelevant     // directories is a performance boost.     $ignore_directories = Settings::get('file_scan_ignore_directories', []);

    // Filter the recursive scan to discover extensions only.     // Important: Without a RecursiveFilterIterator, RecursiveDirectoryIterator     // would recurse into the entire filesystem directory tree without any kind     // of limitations.     $filter = new RecursiveExtensionFilterIterator($directory_iterator, $ignore_directories);
    $filter->acceptTests($include_tests);

    // The actual recursive filesystem scan is only invoked by instantiating the     // RecursiveIteratorIterator.     $iterator = new \RecursiveIteratorIterator($filter,
      \RecursiveIteratorIterator::LEAVES_ONLY,
      // Suppress filesystem errors in case a directory cannot be accessed.       \RecursiveIteratorIterator::CATCH_GET_CHILD
    );

    foreach ($iterator as $key => $fileinfo) {