Blacklist that spam, with PHP!
(Page 2 out of 2)Creating our blacklist system is very. The first thing that must be done is open the blacklist. This is easily done using the file() function.
$blacklist = file("/home/you/public_html/blacklist.txt");
?>
The blacklist is now loaded in an array called blacklist. Each entry is a separate array item. All that�s left to do is loop through each entry, using foreach(), then checking if the entry isn�t a comment or blank, and finally checking the message for that entry, using preg_match() (after all, we did want regular expression support). The code looks something like this:
foreach ($blacklist as $item) {
// Check if item isn't empty or comment
$item = trim($item);
if (!empty($item) AND substr($item, 0, 1) != "#") {
// Not a comment, or empty, check message
if (preg_match("/" . $item . "/i", $message, $match)) {
// Blacklisted URL found
die("Sorry, your message has been denied because a blacklisted URL (" . $match['0'] . ") has been found.");
}
}
}
?>
That�s all there is to it. You can certainly make it a bit better by changing the error message, checking other fields (e.g. a separate �homepage� field), and even including relevancy points. But the above code will already stop a hell of a lot spam, if you�ve got a decent blacklist.
View sample script | Download sample script
