Posted by deko on 02/08/07 17:17

> $refhost = preg_replace('/\&/', '\&amp\;', $refhost);

I think this will work, but htspecialchars() might be a better fit here.

Another situation where preg_replace() might be better is this:

Let's say I get a visitor using the following agent:

<a href="http://netforex.net"> Forex Trading Network Organization </a>
info@netforex.org

This indicates a robot (not a real visitor), so I want to identify it as such
with this code:

//well-known browsers
if(eregi("firefox.",$agent))
{
$browser = "firefox";
}
elseif(eregi("other browsers")
{
$browser = "other browsers";
}
//well-known bots
elseif (eregi("(bot|google|slurp|scooter|spider|infoseek|[etc., etc.])",
$agent))
{
$browser = "bot";
}
//unknown bots - identified by having a URL in the agent srting
elseif (eregi("http://", $agent))
{
$agent = stristr($agent, "http://");
$agent = parse_url($agent);
$agent = $agent['host'];
$agent_a = explode(".", $agent);
$agent_r = array_reverse($agent_a);
$sub = count($agent_r) - 1;
$tld3 = substr($agent_r[0], 0, 3);
if (eregi("^(com|net|org|edu|biz|gov)$", $tld3)) //common tld's
{
while ($sub > 0)
{
$domain = $domain.$agent_r[$sub].".";
$sub--;
}
$refurl = $domain.$tld3; //use for building referring site link
}
$browser = "bot";
}
else
{
$browser = "unknown";
}

I know this is kind of a hack... any thoughts for improvement?

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