在按钮单击时使用curl下载文件

问题描述：

I need help to make this, It download the file on my server when refresh but I want that it should start download on button click. Here is my code

//File to save the contents to
$fp = fopen ('files2.tar', 'w+');

$url = "http://localhost/files.tar";

//Here is the file we are downloading, replace spaces with %20
$ch = curl_init(str_replace(" ","%20",$url));

//give curl the file pointer so that it can write to it

curl_setopt($ch, CURLOPT_FILE, $fp);

curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);

$data = curl_exec($ch);//get curl response

//done
curl_close($ch);

How to I make a button that download file on click. I know I need to make a function that execute on click but I don't know how to start. If need it can use javascript or jquery Thanks in advance.

我需要帮助才能做到这一点，它在刷新时在我的服务器上下载文件，但我希望它应该开始下载点击按钮。这是我的代码 p>

  //文件将内容保存到
 $ fp = fopen（'files2.tar'，'w +'）; 
 
 $ url  =“http：//localhost/files.tar”; 
 
 //这是我们正在下载的文件，用％20替换空格
 $ ch = curl_init（str_replace（“”，“％20”，$  url））; 
  code>  pre> 
 
  //给curl文件指针以便它可以写入它 p> 
 
 
  curl_setopt  （$ ch，CURLOPT_FILE，$ fp）; 
 
 ncurl_setopt（$ ch，CURLOPT_FOLLOWLOCATION，true）; 
 
 $ data = curl_exec（$ ch）; //得到卷曲响应
 
 //完成
curl_close  （$ ch）; 
  code>  pre> 
 
 如何创建一个单击下载文件的按钮。 我知道我需要创建一个单击执行的函数，但我不知道如何开始。 如果需要它可以使用javascript或jquery 
提前谢谢。   p> 
  div>

答

You can do this using several methods.

One and most easy I think is to make a form and submit that form on click of a button. Check for data on server to know user want to download the file.

So your HTML code should look like this:

<form method="POST">
   <input type="submit" value="DOWNLOAD FILE" name="downloadfile"/>
</form>

Now at the top of the your PHP script you should check if user wants to download file or not. Like this:

<?php

    if(isset($_POST["downloadfile"])) {
         //File to save the contents to
        $fp = fopen ('files2.tar', 'w+');
        $url = "http://localhost/files.tar";
        //Here is the file we are downloading, replace spaces with %20
        $ch = curl_init(str_replace(" ","%20",$url));
        //give curl the file pointer so that it can write to it
        curl_setopt($ch, CURLOPT_FILE, $fp);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        $data = curl_exec($ch);//get curl response
        //done
        curl_close($ch);
    }


    // Your other page Code should be here.

?>

This script will make sure that on page load file won't get downloaded, it will get downloaded only after clicking Submit button.

在按钮单击时使用curl下载文件

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