php文件下载

最新推荐文章于 2023-12-14 17:44:49 发布

翻译最新推荐文章于 2023-12-14 17:44:49 发布 · 156 阅读

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本文介绍了一个在PHP中实现文件强制下载的方法。该方法通过定义一个名为force_download的函数来实现，此函数接受文件名、文件数据及是否设置MIME类型等参数，并通过设置HTTP头来触发浏览器的下载行为。

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<?php

defined('BASEPATH') OR exit('No direct script access allowed');


if ( ! function_exists('force_download'))
{

    function force_download($filename = '', $data = '', $set_mime = FALSE)
    {
        if ($filename === '' OR $data === '')
        {
            return;
        }
        elseif ($data === NULL)
        {
            if ( ! @is_file($filename) OR ($filesize = @filesize($filename)) === FALSE)
            {
                return;
            }

            $filepath = $filename;
            $filename = explode('/', str_replace(DIRECTORY_SEPARATOR, '/', $filename));
            $filename = end($filename);
        }
        else
        {
            $filesize = strlen($data);
        }

        // Set the default MIME type to send
        $mime = 'application/octet-stream';

        $x = explode('.', $filename);
        $extension = end($x);

        if ($set_mime === TRUE)
        {
            if (count($x) === 1 OR $extension === '')
            {

                return;
            }

            // Load the mime types
            $mimes =& get_mimes();

            // Only change the default MIME if we can find one
            if (isset($mimes[$extension]))
            {
                $mime = is_array($mimes[$extension]) ? $mimes[$extension][0] : $mimes[$extension];
            }
        }

        if (count($x) !== 1 && isset($_SERVER['HTTP_USER_AGENT']) && preg_match('/Android\s(1|2\.[01])/', $_SERVER['HTTP_USER_AGENT']))
        {
            $x[count($x) - 1] = strtoupper($extension);
            $filename = implode('.', $x);
        }

        if ($data === NULL && ($fp = @fopen($filepath, 'rb')) === FALSE)
        {
            return;
        }

        // Clean output buffer
        if (ob_get_level() !== 0 && @ob_end_clean() === FALSE)
        {
            @ob_clean();
        }

        // Generate the server headers
        header('Content-Type: '.$mime);
        header('Content-Disposition: attachment; filename="'.$filename.'"');
        header('Expires: 0');
        header('Content-Transfer-Encoding: binary');
        header('Content-Length: '.$filesize);
        header('Cache-Control: private, no-transform, no-store, must-revalidate');

        // If we have raw data - just dump it
        if ($data !== NULL)
        {
            exit($data);
        }

        // Flush 1MB chunks of data
        while ( ! feof($fp) && ($data = fread($fp, 1048576)) !== FALSE)
        {
            echo $data;
        }

        fclose($fp);
        exit;
    }
}