PHP file_get_contents()的行为与浏览器不同 [英] PHP file_get_contents() behaves differently to browser

问题描述

我正在尝试使用PHP下载网页的内容. 当我发出命令时:

I'm trying to download the contents of a web page using PHP. When I issue the command:

$f = file_get_contents("http://mobile.mybustracker.co.uk/mobile.php?searchMode=2");

它返回一个页面，报告服务器已关闭.但是，当我将相同的URL粘贴到浏览器中时，我得到了预期的页面.

It returns a page that reports that the server is down. Yet when I paste the same URL into my browser I get the expected page.

有人知道这是什么原因吗?是否有file_get_contents传输任何将其与浏览器请求区分开的标头?

Does anyone have any idea what's causing this? Does file_get_contents transmit any headers that differentiate it from a browser request?

推荐答案

是的，有区别-浏览器倾向于发送大量附加内容

Yes, there are differences -- the browser tends to send plenty of additionnal HTTP headers, I'd say ; and the ones that are sent by both probably don't have the same value.

在这里，经过几次测试后，似乎有必要传递名为Accept的HTTP标头.

Here, after doing a couple of tests, it seems that passing the HTTP header called Accept is necessary.

这可以使用file_get_contents的第三个参数来完成，以指定其他上下文信息:

This can be done using the third parameter of file_get_contents, to specify additionnal context informations :

$opts = array('http' =>
    array(
        'method'  => 'GET',
        //'user_agent '  => "Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2) Gecko/20100301 Ubuntu/9.10 (karmic) Firefox/3.6",
        'header' => array(
            'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*\/*;q=0.8
'
        ), 
    )
);
$context  = stream_context_create($opts);

$f = file_get_contents("http://mobile.mybustracker.co.uk/mobile.php?searchMode=2", false, $context);
echo $f;

有了这个，我就能获得页面的HTML代码.

With this, I'm able to get the HTML code of the page.

注意:

• 我首先测试了通过User-Agent的情况，但似乎没有必要-这就是为什么相应的行在此处作为注释的原因
• Accept标头中使用的值是在尝试使用file_get_contents之前我向Firefox请求该页面时使用的Firefox.
  • 其他一些值可能还可以，但是我没有做任何测试来确定哪个值是必需的.
  • I first tested passing the User-Agent, but it doesn't seem to be necessary -- which is why the corresponding line is here as a comment
  • The value is used for the Accept header is the one Firefox used when I requested that page with Firefox before trying with file_get_contents.
    • Some other values might be OK, but I didn't do any test to determine which value is the required one.

    
    有关更多信息，您可以查看:

    
    For more informations, you can take a look at :

    • file_get_contents
    • stream_context_create
    • 上下文选项和参数
    • HTTP上下文选项 -这是有趣的页面，在这里;-)
    • file_get_contents
    • stream_context_create
    • Context options and parameters
    • HTTP context options -- that's the interesting page, here ;-)

    这篇关于PHP file_get_contents()的行为与浏览器不同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！