How to extract internal links of site?

Yes as the title says

How I can extract internal links of a website from a particular page?

only Internal links and no external links

 

function fetch_links($url)
{
	if (!preg_match('/^https?:\/\/(\w+\.)?([^\/]+)/i', $url, $host))
	{
		trigger_error('Invalid URL given.');
		return false;
	}

	if (preg_match_all('/<a.+href\s*=\s*["\']([^"\']+)[^>]*>.*?<\/a>/i', @file_get_contents($url), $links))
	{
		foreach (array_unique($links[1]) AS $index => $link)
		{
			$link = trim($link);

			if (preg_match('/^(ht|f)tps?:\/\//i', $link) AND !preg_match('/^(ht|f)tps?:\/\/(\w+\.)?' . preg_quote($host[2], '/') .'/i', $link) OR $link[0] == '#')
			{
				unset($links[1][$index]);
			}
		}
		
		return $links[1];
	}
	
	return false;
}

PHP:

Usage example:

echo '<pre>' . print_r(fetch_links('http://forums.digitalpoint.com/showthread.php?t=367847'), true) . '</pre>';

PHP:

 

I, replaced url by

my site http://www.jeffbrowninc.com

Result

It does not seem to show all the internal links and how to do with a url if it has PHPsession ID

 

Just a slight error in the pattern. This works for me.

function fetch_links($url)
{
    if (!preg_match('/^https?:\/\/(\w+\.)?([^\/]+)/i', $url, $host))
    {
        trigger_error('Invalid URL given.');
        return false;
    }

    if (preg_match_all('/<a.*?href\s*=\s*["\']([^"\']+)[^>]*>.*?<\/a>/i', @file_get_contents($url), $links))
    {
        foreach ($links[1] AS $index => $link)
        {
            $link = trim($link);

            if (preg_match('/^(ht|f)tps?:\/\//i', $link) AND !preg_match('/^(ht|f)tps?:\/\/(\w+\.)?' . preg_quote($host[2], '/') .'/i', $link) OR $link[0] == '#')
            {
				unset($links[1][$index]);
            }
        }
       
        return array_unique($links[1]);
    }
   
    return false;
}

PHP:

And what do you mean with the session ID? Do you want to remove it from the string?

If so, try replacing this:

$link = trim($link);

PHP:

With:

$links[1][$index] = trim(preg_replace('/(&|\?)(s|PHPSESSID)=[a-f0-9]{32}/', null, html_entity_decode($link)));

PHP:

 

Yes it works fine!

No problem with PHPsession ID's!