Hi,
I have a php script that open pages and check the html for specific backlinks.
I have a problem when a url has a redirect loop, my program does not work.

Any suggestions for identifying if a web address has a redirect loop?

Thanks

Can you clarify? Is your script following links? So if Page A links to Page B which links back to Page A your script will be stuck in a loop?

If that's the case you just need to keep track of which URLs you've already visited and ignore any additional links to that URL.

Ideally you should be using CURL for this..
If so, You can use the CURLOPT_MAXREDIRS function to stop it.

NO it is not following links it is opening a webage like this:

PHP Code:

$field['url_get'] = @fsockopen($field['hostname_short'], $field['hostname_port']); # Connect to domain
            fputs($field['url_get'], "GET ".$field['hostname_page']." HTTP/1.0\r\nHost: ".$field['hostname_short']."\r\n\r\n"); # Request page from domain

            $field['url_content'] = "";

            while(!feof($field['url_get'])) { # Get data by line and store

                $field['url_content'] .= fgets($field['url_get'], 10240);

            } 


And then looking for specific text (links)
Thanks

Using cURL you should be able to read the HTTPD headers and determine if the Location: header is set.

Or check the response code for 301, 302 or 307.