PHP を使用してディレクトリの内容を再帰的にコピーするにはどうすればよいですか?

<code class="php">function recurseCopy(
    string $sourceDirectory,
    string $destinationDirectory,
    string $childFolder = ''
): void {
    // Open the source directory
    $directory = opendir($sourceDirectory);

    // Check if the destination directory exists, if not, create it
    if (is_dir($destinationDirectory) === false) {
        mkdir($destinationDirectory);
    }

    // If there's a child folder specified, create it if it doesn't exist
    if ($childFolder !== '') {
        if (is_dir("$destinationDirectory/$childFolder") === false) {
            mkdir("$destinationDirectory/$childFolder");
        }

        // Loop through the files in the source directory
        while (($file = readdir($directory)) !== false) {
            // Ignore current and parent directories
            if ($file === '.' || $file === '..') {
                continue;
            }

            // If the current file is a directory, recursively copy it
            if (is_dir("$sourceDirectory/$file") === true) {
                recurseCopy("$sourceDirectory/$file", "$destinationDirectory/$childFolder/$file");
            }
            // If it's a file, simply copy it
            else {
                copy("$sourceDirectory/$file", "$destinationDirectory/$childFolder/$file");
            }
        }

        // Close the source directory
        closedir($directory);

        // Recursion ends here
        return;
    }

    // Loop through the files in the source directory
    while (($file = readdir($directory)) !== false) {
        // Ignore current and parent directories
        if ($file === '.' || $file === '..') {
            continue;
        }

        // If the current file is a directory, recursively copy it
        if (is_dir("$sourceDirectory/$file") === true) {
            recurseCopy("$sourceDirectory/$file", "$destinationDirectory/$file");
        }
        // If it's a file, simply copy it
        else {
            copy("$sourceDirectory/$file", "$destinationDirectory/$file");
        }
    }

    // Close the source directory
    closedir($directory);
}</code>