<?php
/**
 * Copyright 2020 Google LLC.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// [START functions_concepts_filesystem]

use Psr\Http\Message\ServerRequestInterface;

function listFiles(ServerRequestInterface $request): string
{
    $contents = scandir(__DIR__);

    $output = 'Files:' . PHP_EOL;

    foreach ($contents as $file) {
        $output .= "\t" . $file . PHP_EOL;
    }

    return $output;
}

// [END functions_concepts_filesystem]
