如何在PHP中返回文件

我想你想要这个：

        $attachment_location = $_SERVER["document_ROOT"] . "/file.zip";        if (file_exists($attachment_location)) { header($_SERVER["SERVER_PROTOCOL"] . " 200 OK"); header("Cache-Control: public"); // needed for internet explorer header("Content-Type: application/zip"); header("Content-Transfer-Encoding: Binary"); header("Content-Length:".filesize($attachment_location)); header("Content-Disposition: attachment; filename=file.zip"); readfile($attachment_location); die();     } else { die("Error: File not found.");        }