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[DragonFire-N[R]]

How would I go about automatically adding <a> tags to people's posts when they type in a URL?

[oni-kun]

You would use Regular expressions (RegEx), with the function preg_replace. Here is a somewhat simple example I wrote, it should work fine:

<?php

$text="www.phpfreaks.com is a great site, Look at www.phpfreaks.com/index.php?&foo=bar#baz";

$text = preg_replace(
"/(?:^|\b)((((http|https|ftp):\/\/)|(www\.))([\w\.]+)([,:%#&\/?=\w+\.-]+))(?:\b|$)/is",
"<a href=\"$1\" target=\"_blank\">$1</a>", $text);

print $text;

?>