php 自动从任何 URL 位置下载图像
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Automatically downloading images from any URL location
提问by Slavisa Perisic
I have a serious problem in the late stage of a project I'm working on:
在我正在从事的项目的后期阶段，我遇到了一个严重的问题：
I wrote a PHP function that makes it possible for a user to download an image automatically on a hard drive by clicking on its link.
But that was easy because the image was uploaded to the website server and I knew it's full server address.
For Example: "home/clients/websites/w_apo/public_html/wp-content/uploads/image.jpg"
我编写了一个 PHP 函数，使用户可以通过单击其链接将图像自动下载到硬盘驱动器上。但这很容易，因为图像已上传到网站服务器，我知道它是完整的服务器地址。例如："home/clients/websites/w_apo/public_html/wp-content/uploads/image.jpg"
But now the client wants the ability to paste the image URL from his own address http://www.something.com/image.jpgand still be able to automatically download that image by clicking on the link on the frontend.
但是现在客户希望能够从他自己的地址粘贴图像 URL，http://www.something.com/image.jpg并且仍然能够通过单击前端的链接自动下载该图像。
I'm kind of new in this area of programming so I really need your help. Any links, advice, resources are most welcome.
我是编程领域的新手，所以我真的需要你的帮助。任何链接、建议、资源都是最受欢迎的。
Thanks!
谢谢！
This is my current function for downloading:
这是我目前的下载功能：
download_file($_GET['file']);
/******************************************************************/
function download_file( $fullPath ){
// Must be fresh start
if( headers_sent() )
die('Headers Sent');
// Required for some browsers
if(ini_get('zlib.output_compression'))
ini_set('zlib.output_compression', 'Off');
// File Exists?
if( file_exists($fullPath) ){
// Parse Info / Get Extension
$fsize = filesize($fullPath);
$path_parts = pathinfo($fullPath);
$ext = strtolower($path_parts["extension"]);
// Determine Content Type
switch ($ext) {
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
default: $ctype="application/force-download";
}
header("Pragma: public"); // required
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Cache-Control: private",false); // required for certain browsers
header("Content-Type: $ctype");
header("Content-Disposition: attachment; filename=\"".basename($fullPath)."\";" );
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".$fsize);
ob_clean();
flush();
readfile( $fullPath );
} else
die('File Not Found');
}
回答by Paul Dessert
You have a couple of options. #1 use file_get_contents. It's not the greatest way, but it will work.
你有几个选择。#1 使用file_get_contents. 这不是最好的方法，但它会奏效。
<?php
//Get the file
$content = file_get_contents("http://example.com/image.jpg");
//Store in the filesystem.
$fp = fopen("/location/to/save/image.jpg", "w");
fwrite($fp, $content);
fclose($fp);
?>
Option #2 use cURL:
选项#2 使用 cURL：
