How to implement file download function in ThinkPHP5

ThinkPHP5 is an excellent PHP framework that provides a wealth of functions, including the implementation of file downloading. In this article, we will introduce how to use ThinkPHP5 to implement the file download function.

1. Preparation

Before you start, you need to make sure that ThinkPHP5 has been installed. If it is not installed yet, you can refer to the official documentation to install it.

2. Write code

1. Create a controller

Create a Download controller in the project's controller directory to implement file downloading Function.

<?php
namespace app\index\controller;
use think\Controller;

class Download extends Controller
{
    public function index()
    {
        //此处编写下载代码
    }
}

2. Implement the download function

Add the following code in the index method to implement the file download function.

public function index()
{
    $file = './public/your_filename'; //文件路径
    if (!file_exists($file)) {
        return "文件不存在";
    }else{
        $fp = fopen($file, "r");
        $file_size = filesize($file);
        header("Content-type: application/octet-stream");
        header("Accept-Ranges: bytes");
        header("Accept-Length:".$file_size);
        header("Content-Disposition: attachment; filename=your_filename");//要下载的文件名字
        $buffer = 1024;
        $filesize = 0;
        while (!feof($fp) && ($filesize < $file_size)) {
            $file_data = fread($fp, $buffer);
            $filesize += $buffer;
            echo $file_data;
        }
        fclose($fp);
    }
}

In the above code, $file represents the path of the file to be downloaded, and "your_filename" needs to be replaced with the actual file name. If the file does not exist, a "File does not exist" message will be returned. If the file exists, set the corresponding HTTP header information to implement file download.

3. Access the download link

When accessing the download link, you only need to specify the index method of the Download controller.

For example, if the domain name of the project is "http://example.com" and the file path is "./public/myfile.zip", then the access link should be: http://example.com/ index.php/index/Download/index.

4. Summary

This article introduces how to use ThinkPHP5 to implement the file download function. It should be noted that the downloaded file must be placed in the public directory, otherwise the download may fail due to permission issues. . If you need to download files from other directories, you need to set the corresponding file read permissions.

Of course, if you have further questions about the details of file download, you can check the manual on the ThinkPHP official website by yourself.

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