如何解决php压缩文件失败的问题

// 文件下载
public static function downFile($id,$admin_id,$cid,$type)
{
$company = checkAdminCompany($admin_id,$cid);
        if (!$company) {
            return [
                'status' => -4,
                'statusMsg' => '公司不存在'
            ];
        }
        if ($type=='file') {
        // 判断是否有权限下载文件
$checkFileRole = self::checkFileRole($admin_id,$cid,$id);
if (!$checkFileRole) {
return [
'status' => 777,
'statusMsg' => '没有操作权限'
];
}
        $select_sql = "SELECT * FROM cloud_storage WHERE id in ($id)";
send_execute_sql($select_sql,$fileInfo);
        } elseif ($type == 'list') {
        // 判断是否有权限移动目录下的文件
$checkRole = self::checkRole($admin_id,$cid,$id);
if (!$checkRole) {
return [
'status' => '777',
'statusMsg' => '没有操作权限'
];
}
        $select_sql = "SELECT * FROM cloud_storage WHERE list_id = $id";
send_execute_sql($select_sql,$fileInfo);
        }
if (empty($fileInfo)) {
        return [
'status' => -400,
'statusMsg' => '文件不存在'
];
        }
 
        foreach ($fileInfo as $key => $value) {
$paths[$key] = $fileInfo[$key]['path'];
}
        //这里需要注意该目录是否存在，并且有创建的权限
$filename = 'logs/down/test.zip'; 
if(!file_exists($filename)){
$zip = new ZipArchive();
if ($zip->open($filename, ZipArchive::CREATE)==TRUE) {
foreach( $paths as $val){
  if(file_exists($val)){
   $zip->addFile( $val, basename($val));
  }
 }
 $zip->close();
}
}
if(!file_exists($filename)){
exit("无法找到文件");
}
header("Cache-Control: public");
header("Content-Description: File Transfer");
header('Content-disposition: attachment; filename='.basename($filename)); //文件名
header("Content-Type: application/zip"); //zip格式的
header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件
header('Content-Length: '. filesize($filename)); //告诉浏览器，文件大小
ob_clean();
flush();
@readfile($filename);
unlink($fileurl);
   exit;
}

ob_clean();
flush();