Autolink of Forum

autolink.php

<?php
	public static function autolink($input) {
		$output = preg_replace_callback("/[\s| ](http:\/\/|https:\/\/|(www\.))(([^\s<]{4,160})[^\s<]*)/",
			create_function(
				'$matches',
				'return "<a href=\"http://".$matches[2].$matches[3]."\" title=\"http://".$matches[2].$matches[3]."\" rel=\"nofollow\" target=\"_blank\">".
						(strlen("http://".$matches[2].$matches[4])>160?"http://".$matches[2].$matches[4]."...":"http://".$matches[2].$matches[4])."</a>";'
			), $input);

		return $output;
	}