如何强制文件在PHP中下载 [英] How to force a file to download in PHP

问题描述

我有图像列表，我想要一个下载链接与每个图像，以便用户可以下载图像。

I have list of images and I want a "Download" link along with every image so that user can download the image.

所以有人可以指导我如何为php中的任何文件提供下载链接？

so can someone guide me How to Provide Download link for any file in php?

编辑

我希望在点击下载链接时显示一个下载面板，我不想导航到浏览器中显示的图像

I want a download panel to be displayed on clicking the download link I dont want to navigate to image to be displayed on the browser

推荐答案

如果您想强制下载，可以使用以下内容：

If you want to force a download, you can use something like the following:

<?php
    // Fetch the file info.
    $filePath = '/path/to/file/on/disk.jpg';

    if(file_exists($filePath)) {
        $fileName = basename($filePath);
        $fileSize = filesize($filePath);

        // Output headers.
        header("Cache-Control: private");
        header("Content-Type: application/stream");
        header("Content-Length: ".$fileSize);
        header("Content-Disposition: attachment; filename=".$fileName);

        // Output file.
        readfile ($filePath);                   
        exit();
    }
    else {
        die('The provided file path is not valid.');
    }
?>

如果您只需使用正常链接链接到此脚本，该文件将被下载。

If you simply link to this script using a normal link the file will be downloaded.

顺便提一句，上面的代码片段需要在页面开始执行（在任何标题或HTML输出发生之前）。还要注意，如果你决定创建一个基于这个功能来下载任意文件 - 你需要确保你阻止目录遍历（ realpath 是方便的），只允许从定义的区域下载等，如果您接受$ _GET或$ _POST的输入。

Incidentally, the code snippet above needs to be executed at the start of a page (before any headers or HTML output had occurred.) Also take care if you decide to create a function based around this for downloading arbitrary files - you'll need to ensure that you prevent directory traversal (realpath is handy), only permit downloads from within a defined area, etc. if you're accepting input from a $_GET or $_POST.

这篇关于如何强制文件在PHP中下载的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！