On Tue, Apr 21, 2009 at 8:29 AM, Alan Chen <c...@datanumen.com> wrote:
> Hi, everyone,
> I want to write a small PHP script test.php that can determine whether a
> webpage is Google Cached.
> Assuming it is uploaded to www.mysite.com, and I want to use it to check
> whether www.yoursite.com is google cached.
> It works as follows:
> The user input the query:
> http://www.mysite.com/test.php?site=www.yoursite.com
> The php script will send the following request to the browser
> http://www.google.com/search?q=cache:www.yoursite.com
> in the background.
> And if the returned result contains a string "This is Google's cache of",
> then the page is cached, so the php script can display
> "Your site is cached by Google"
> otherwise, it will say
> "Your site is not cached by Google"
> Just wonder how to implement such a feature, can anyone write a simple
> sample so that I can use as a startpoint as I am a totally new guy in PHP
> coding

You've already laid out most of what needs to be done. I think the
file_get_contents() function will be your best friend here, provided
allow_url_fopen has been set to TRUE in your PHP configuration. Take
the result you get back from that function and parse the 2nd line for
">This is Google&#39;s cache of <" (I have made this assumption by
looking at the source of

$url = $_GET['url'];
$res = file_get_contents('http://www.google.com/search?q=cache:' . $url);
if($res && strstr('>This is Google&#39;s cache of <', $res))
  echo 'Your page is cached.';
  echo 'Your page is not cached.';

UNTESTED. Hope this helps.

// Todd

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