Thanks for your help Michael, I'll try it out.
Frank
> At 01:45 AM 1/24/2002 +0100, Frank Benady wrote:
> >Hi All
> >
> >Can I emulate the first request of a browser when it tries to connect
to a
> >distant server using a domain name and parse the answer from the
remote
> >server to know if there is a website located there or if there is no
hosting
> >(or even some kind of forwarding) configured for this domain name ?
> >Is ther some http functions in PHP which permit to do this test ?
>
> You can use fsockopen() to open a socket connection to a remote host
via
> port 80 (HTTP). If fsockopen() returns a valid file pointer then that
> means there is something listening on port 80 on the host (99% it will
be a
> web server).
>
> You could then use fputs() to send a request to the server, such as:
>
> "HEAD / HTTP/1.0\r\n\r\n"
>
> Normally browsers use GET instead of HEAD, but in your case you are
only
> interested in the servers response (the HTTP headers) and not the
actual
> file/page itself.
>
> You could then use fgets() to read the response sent back from the
server
> and parse it to get the information you wanted (for example, look for
a
> "Location: ..." line in the headers to see if the page is trying to
> redirect the browser).
>
> I have a function that checks to see if a particular file is available
via
> HTTP from a remote host. It takes a full URL and returns true if the
> page/file exists, and false if it doesn't. With some work you could
modify
> this script to achieve what you want. I'm posting it below. Ask if
you
> have any questions about it.
>
> Oh, BTW, I'm sure that I have (as usually) went totally overboard with
this
> function and someone will now probably point out that PHP has
something
> built in to do what I'm doing here...but I couldn't find it and I had
fun
> writing this function anyway. :-)
>
> <?
> function http_file_exists ($url) {
>
> if (!preg_match("/^http:\/\/([^\/]+)\/.*$/i",$url,$matches)) {
>
> return "Error - incorrect format";
>
> } else {
>
> $host = $matches[1];
> $fp = fsockopen ($host, 80, $errno, $errstr, 30);
> if (!$fp) return "Error - couldn't connect to host";
> else {
> fputs ($fp, "HEAD $url HTTP/1.0\r\n\r\n");
> $response = fgets ($fp,128);
> fclose ($fp);
> return (eregi("^.+200 OK.+$",$response) ? true : false);
> }
>
> }
> }
> ?>
>
>
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