file_get_contents显示图像不正确 [英] file_get_contents displaying image incorrectly

问题描述

我正在尝试将通用网站和URL显示为我自己的网站的一部分.这是我正在使用的相对简单的代码的一部分:

browse.php

<?   
$enteredurl = $_GET["url"];
$page = file_get_contents($enteredurl);
echo $page;
?>

如果URls是相对的而不是绝对的，则可以忽略某些链接/图像不起作用的事实，这很好.页面是使用$ _GET访问的，类似

browse.php?url = http://itracki.com

该网页将按预期显示.但是，当我尝试获取其他东西(例如图像)时，会得到类似的东西，我认为它是二进制文件还是其他东西?

browse.php?url = http://images.itracki.com /2011/06/favicon.png

‰PNG  IHDRóÿa%IDAT8Ëc8sæÌJ0M ```ã3`xaÔ€aa]r#f.–ÄíNIEND®B`‚

我一直在网上寻找并尝试修改页面标题，例如

<? header('Content-type: image/png;'); ?>

但是我仍然得到同样的混乱结果.如果有人通过键入" http://images.itracki.com/2011/06/favicon.png "添加到地址栏中?

谢谢！

解决方案

尝试一下:

<?php
  $img = 'http://images.itracki.com/2011/06/favicon.png';
  $info = getimagesize($img);
  header('Content-type: ' . $info['mime']);
  readfile($img);
?>

在这种情况下，应使用readfile()而不是file_get_contents()，因为readfile()会将文件内容直接发送到浏览器，而不是将其存储在内存中供以后检索，这是file_get_contents()的作用. /p>

还请注意，content-type是动态检索的，因此您不必担心在标头中错误地指定它.

某些图像的扩展名可能与content-type或mime-type不匹配，因此可以纠正这些类型的问题.

I'm trying to display generic websites and URLs as part of my own site. Here's part of the relatively simple code I'm using:

browse.php

<?   
$enteredurl = $_GET["url"];
$page = file_get_contents($enteredurl);
echo $page;
?>

Ignoring the fact that some links/images will not work if the URls are relative rather than absolute, this works just fine. Pages are accessed using $_GET, something like

browse.php?url=http://itracki.com

The webpage will display as expected. However, when I'm trying to get something else, like an image, I get something like this, which I'm thinking is binary or something?

browse.php?url=http://images.itracki.com/2011/06/favicon.png

‰PNG  IHDRóÿa%IDAT8Ëc8sæÌJ0M ```ã3`xaÔ€aa]r#f.–ÄíNIEND®B`‚

I've been looking online and tried modifying the page headers, something like

<? header('Content-type: image/png;'); ?>

but I'm still getting the same jumbled up result. Does anyone know how I can actually see the image as it is if I were just accessing it by typing "http://images.itracki.com/2011/06/favicon.png" into the address bar?

Thanks!

解决方案

Try this:

<?php
  $img = 'http://images.itracki.com/2011/06/favicon.png';
  $info = getimagesize($img);
  header('Content-type: ' . $info['mime']);
  readfile($img);
?>

You should use readfile() instead of file_get_contents() in this situation because readfile() will send the file contents directly to the browser rather than storing it in memory for a later retrieval, which is what file_get_contents() does.

Also note that the content-type is retrieved dynamically so that you don't have to worry about specifying it incorrectly in the header.

Some images may have an extension that doesn't match its content-type or mime-type, so this corrects for those type of issues.

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