Zip已创建但未在PHP中提取

Question

我正在开发一个项目，我必须创建zip文件并通过电子邮件发送给最终用户，我尝试了以下代码

function createZipAndDownload($files, $filesPath, $zipFileName)
{
    // Create instance of ZipArchive. and open the zip folder.
    $zip = new \ZipArchive();
    if ($zip->open($zipFileName, \ZipArchive::CREATE) !== TRUE) {
        exit("cannot open <$zipFileName>\n");
    }
    // Adding every attachments files into the ZIP.
    foreach ($files as $file) {
        $zip->addFile($filesPath . $file, $file);
    }
    $zip->close();
    // Download the created zip file
    header("Content-type: application/zip");
    header("Content-Disposition: attachment; filename = $zipFileName");
    header("Pragma: no-cache");
    header("Expires: 0");
    readfile("$zipFileName");
    exit;
}
// Files which need to be added into zip
$files = array('abc.pdf','abc.xlsx');
// Directory of files
$filesPath = $_SERVER['DOCUMENT_ROOT'] . '/zipper/zipper/files/';
// Name of creating zip file
$zipName = 'document.zip';
echo createZipAndDownload($files, $filesPath, $zipName);

它运行正常并且zip文件被下载但是当我尝试提取它时显示错误并且文件将不被提取。谢谢