php OSS 文件读取和写入文件，workerman 生成临时文件并输出浏览器下载

//读取文件
header("Content-Type: text/html;charset=utf-8"); //设置字符编码
$file = base_path() . "/public/index.m3u8";
$read = fopen($file, 'r');
$contents = fread($read, filesize($file));
$string1 = getBeforeString($contents, 'enc.key');
$string2 = getLaterString($contents, 'enc.key');
$newContents = $string1 . 'enc.key?token=123' . $string2;
fclose($read);

//写入文件
$file = base_path() . "/public/test22.m3u8";
$handle = fopen($file, 'w'); //打开文件
fwrite($handle, $newContents); //写入内容
fclose($handle); //关闭文件
readfile($file); //读取并输出文件全部内容
return redirect(WEB_URL . '/test22.m3u8'); //调转页面

//读取OSS文件
$file = OSS_URL . $url1;
//文件内容加入数组
$fileContent = @file($file);
$newContent = '';
//遍历文件的每一行
foreach ($fileContent as $value) {
    //文件该行是否存在这个字符,有这替换内容
    if (strpos($value, 'api.qingsong.chaotuapp.com/') !== false) {
        $value = str_replace('app.com/', "q.com/ckey", $value);
    }
    //文件该行是否存在这个字符,有这拼接内容
    if (strpos($value, '.ts') !== false) {
        $value = $ossUrl . $value;
    }
    $newContent .= $value;
}

//写入文件
$fileName = "$token.m3u8"; // ./59ee8147cf3f42575bc91ff586d54837.m3u8
$file = "./$fileName"; //打开文件
$handle = fopen($file, 'w');
//写入内容
fwrite($handle, $newContent);
//将文件转字符串
$content = file_get_contents($file);
//删除临时文件
unlink($file);
//输出浏览器
$response = new Response();
return $response->withHeader('content-description', 'File Transfer')
    ->withHeader('content-type', 'application/force-download')
    ->withHeader('content-disposition', "attachment; filename={$fileName}")
    ->withHeader('content-transfer-encoding', 'binary')
    ->withHeader('pragma', 'public')
    ->withBody($content);